Library prosa.results.fixed_priority.rta.limited_preemptive
(* ----------------------------------[ coqtop ]---------------------------------
Welcome to Coq 8.13.0 (January 2021)
----------------------------------------------------------------------------- *)
Require Export prosa.results.fixed_priority.rta.bounded_nps.
Require Export prosa.analysis.facts.preemption.rtc_threshold.limited.
From mathcomp Require Import ssreflect ssrbool eqtype ssrnat seq path fintype bigop.
RTA for FP-schedulers with Fixed Preemption Points
In this module we prove the RTA theorem for FP-schedulers with fixed preemption points.
Furthermore, we assume the task model with fixed preemption points.
Require Import prosa.model.preemption.limited_preemptive.
Require Import prosa.model.task.preemption.limited_preemptive.
Require Import prosa.model.task.preemption.limited_preemptive.
Consider any type of tasks ...
... and any type of jobs associated with these tasks.
Context {Job : JobType}.
Context `{JobTask Job Task}.
Context `{JobArrival Job}.
Context `{JobCost Job}.
Context `{JobTask Job Task}.
Context `{JobArrival Job}.
Context `{JobCost Job}.
Consider any arrival sequence with consistent, non-duplicate arrivals.
Variable arr_seq : arrival_sequence Job.
Hypothesis H_arrival_times_are_consistent : consistent_arrival_times arr_seq.
Hypothesis H_arr_seq_is_a_set : arrival_sequence_uniq arr_seq.
Hypothesis H_arrival_times_are_consistent : consistent_arrival_times arr_seq.
Hypothesis H_arr_seq_is_a_set : arrival_sequence_uniq arr_seq.
Consider an arbitrary task set ts, ...
... assume that all jobs come from the task set, ...
... and the cost of a job cannot be larger than the task cost.
First, we assume we have the model with fixed preemption points.
I.e., each task is divided into a number of non-preemptive segments
by inserting statically predefined preemption points.
Context `{JobPreemptionPoints Job}
`{TaskPreemptionPoints Task}.
Hypothesis H_valid_model_with_fixed_preemption_points:
valid_fixed_preemption_points_model arr_seq ts.
`{TaskPreemptionPoints Task}.
Hypothesis H_valid_model_with_fixed_preemption_points:
valid_fixed_preemption_points_model arr_seq ts.
Let max_arrivals be a family of valid arrival curves, i.e., for any task [tsk] in ts
[max_arrival tsk] is (1) an arrival bound of [tsk], and (2) it is a monotonic function
that equals 0 for the empty interval [delta = 0].
Context `{MaxArrivals Task}.
Hypothesis H_valid_arrival_curve : valid_taskset_arrival_curve ts max_arrivals.
Hypothesis H_is_arrival_curve : taskset_respects_max_arrivals arr_seq ts.
Hypothesis H_valid_arrival_curve : valid_taskset_arrival_curve ts max_arrivals.
Hypothesis H_is_arrival_curve : taskset_respects_max_arrivals arr_seq ts.
Let [tsk] be any task in ts that is to be analyzed.
Next, consider any ideal uni-processor schedule with limited preemptions of this arrival sequence ...
Variable sched : schedule (ideal.processor_state Job).
Hypothesis H_jobs_come_from_arrival_sequence:
jobs_come_from_arrival_sequence sched arr_seq.
Hypothesis H_schedule_respects_preemption_model:
schedule_respects_preemption_model arr_seq sched.
Hypothesis H_jobs_come_from_arrival_sequence:
jobs_come_from_arrival_sequence sched arr_seq.
Hypothesis H_schedule_respects_preemption_model:
schedule_respects_preemption_model arr_seq sched.
... where jobs do not execute before their arrival or after completion.
Hypothesis H_jobs_must_arrive_to_execute : jobs_must_arrive_to_execute sched.
Hypothesis H_completed_jobs_dont_execute : completed_jobs_dont_execute sched.
Hypothesis H_completed_jobs_dont_execute : completed_jobs_dont_execute sched.
Consider an FP policy that indicates a higher-or-equal priority relation,
and assume that the relation is reflexive and transitive.
Context `{FP_policy Task}.
Hypothesis H_priority_is_reflexive : reflexive_priorities.
Hypothesis H_priority_is_transitive : transitive_priorities.
Hypothesis H_priority_is_reflexive : reflexive_priorities.
Hypothesis H_priority_is_transitive : transitive_priorities.
Assume we have sequential tasks, i.e, jobs from the
same task execute in the order of their arrival.
Next, we assume that the schedule is a work-conserving schedule...
... and the schedule respects the policy defined by the [job_preemptable]
function (i.e., jobs have bounded non-preemptive segments).
Total Workload and Length of Busy Interval
Next, we introduce [task_rbf] as an abbreviation
for the task request bound function of task [tsk].
Using the sum of individual request bound functions, we define
the request bound function of all tasks with higher priority
...
... and the request bound function of all tasks with higher
priority other than task [tsk].
Next, we define a bound for the priority inversion caused by tasks of lower priority.
Let blocking_bound :=
\max_(tsk_other <- ts | ~~ hep_task tsk_other tsk)
(task_max_nonpreemptive_segment tsk_other - ε).
\max_(tsk_other <- ts | ~~ hep_task tsk_other tsk)
(task_max_nonpreemptive_segment tsk_other - ε).
Let L be any positive fixed point of the busy interval recurrence, determined by
the sum of blocking and higher-or-equal-priority workload.
Variable L : duration.
Hypothesis H_L_positive : L > 0.
Hypothesis H_fixed_point : L = blocking_bound + total_hep_rbf L.
Hypothesis H_L_positive : L > 0.
Hypothesis H_fixed_point : L = blocking_bound + total_hep_rbf L.
Response-Time Bound
Next, consider any value R, and assume that for any given arrival A from search space
there is a solution of the response-time bound recurrence which is bounded by R.
Variable R: nat.
Hypothesis H_R_is_maximum:
∀ (A : duration),
is_in_search_space A →
∃ (F : duration),
A + F = blocking_bound
+ (task_rbf (A + ε) - (task_last_nonpr_segment tsk - ε))
+ total_ohep_rbf (A + F) ∧
F + (task_last_nonpr_segment tsk - ε) ≤ R.
Hypothesis H_R_is_maximum:
∀ (A : duration),
is_in_search_space A →
∃ (F : duration),
A + F = blocking_bound
+ (task_rbf (A + ε) - (task_last_nonpr_segment tsk - ε))
+ total_ohep_rbf (A + F) ∧
F + (task_last_nonpr_segment tsk - ε) ≤ R.
Now, we can reuse the results for the abstract model with
bounded non-preemptive segments to establish a response-time
bound for the more concrete model of fixed preemption points.
Let response_time_bounded_by := task_response_time_bound arr_seq sched.
Theorem uniprocessor_response_time_bound_fp_with_fixed_preemption_points:
response_time_bounded_by tsk R.
(* ----------------------------------[ coqtop ]---------------------------------
1 subgoal (ID 138)
Task : TaskType
H : TaskCost Task
Job : JobType
H0 : JobTask Job Task
H1 : JobArrival Job
H2 : JobCost Job
arr_seq : arrival_sequence Job
H_arrival_times_are_consistent : consistent_arrival_times arr_seq
H_arr_seq_is_a_set : arrival_sequence_uniq arr_seq
ts : seq Task
H_all_jobs_from_taskset : all_jobs_from_taskset arr_seq ts
H_valid_job_cost : arrivals_have_valid_job_costs arr_seq
H3 : JobPreemptionPoints Job
H4 : TaskPreemptionPoints Task
H_valid_model_with_fixed_preemption_points : valid_fixed_preemption_points_model
arr_seq ts
H5 : MaxArrivals Task
H_valid_arrival_curve : valid_taskset_arrival_curve ts max_arrivals
H_is_arrival_curve : taskset_respects_max_arrivals arr_seq ts
tsk : Task
H_tsk_in_ts : tsk \in ts
sched : schedule (processor_state Job)
H_jobs_come_from_arrival_sequence : jobs_come_from_arrival_sequence sched
arr_seq
H_schedule_respects_preemption_model : schedule_respects_preemption_model
arr_seq sched
H_jobs_must_arrive_to_execute : jobs_must_arrive_to_execute sched
H_completed_jobs_dont_execute : completed_jobs_dont_execute sched
H6 : FP_policy Task
H_priority_is_reflexive : reflexive_priorities
H_priority_is_transitive : transitive_priorities
H_sequential_tasks : sequential_tasks arr_seq sched
H_work_conserving : work_conserving arr_seq sched
H_respects_policy : respects_policy_at_preemption_point arr_seq sched
rbf := task_request_bound_function : Task -> duration -> nat
task_rbf := rbf tsk : duration -> nat
total_hep_rbf := total_hep_request_bound_function_FP ts tsk
: duration -> nat
total_ohep_rbf := total_ohep_request_bound_function_FP ts tsk
: duration -> nat
blocking_bound := \max_(tsk_other <- ts | ~~ hep_task tsk_other tsk)
(task_max_nonpreemptive_segment tsk_other - ε) : nat
L : duration
H_L_positive : 0 < L
H_fixed_point : L = blocking_bound + total_hep_rbf L
is_in_search_space := bounded_pi.is_in_search_space tsk L : nat -> bool
R : nat
H_R_is_maximum : forall A : duration,
is_in_search_space A ->
exists F : duration,
A + F =
blocking_bound +
(task_rbf (A + ε) - (task_last_nonpr_segment tsk - ε)) +
total_ohep_rbf (A + F) /\
F + (task_last_nonpr_segment tsk - ε) <= R
response_time_bounded_by := task_response_time_bound arr_seq sched
: Task -> duration -> Prop
============================
response_time_bounded_by tsk R
----------------------------------------------------------------------------- *)
Proof.
move: (H_valid_model_with_fixed_preemption_points) ⇒ [MLP [BEG [END [INCR [HYP1 [HYP2 HYP3]]]]]].
(* ----------------------------------[ coqtop ]---------------------------------
1 subgoal (ID 200)
Task : TaskType
H : TaskCost Task
Job : JobType
H0 : JobTask Job Task
H1 : JobArrival Job
H2 : JobCost Job
arr_seq : arrival_sequence Job
H_arrival_times_are_consistent : consistent_arrival_times arr_seq
H_arr_seq_is_a_set : arrival_sequence_uniq arr_seq
ts : seq Task
H_all_jobs_from_taskset : all_jobs_from_taskset arr_seq ts
H_valid_job_cost : arrivals_have_valid_job_costs arr_seq
H3 : JobPreemptionPoints Job
H4 : TaskPreemptionPoints Task
H_valid_model_with_fixed_preemption_points : valid_fixed_preemption_points_model
arr_seq ts
H5 : MaxArrivals Task
H_valid_arrival_curve : valid_taskset_arrival_curve ts max_arrivals
H_is_arrival_curve : taskset_respects_max_arrivals arr_seq ts
tsk : Task
H_tsk_in_ts : tsk \in ts
sched : schedule (processor_state Job)
H_jobs_come_from_arrival_sequence : jobs_come_from_arrival_sequence sched
arr_seq
H_schedule_respects_preemption_model : schedule_respects_preemption_model
arr_seq sched
H_jobs_must_arrive_to_execute : jobs_must_arrive_to_execute sched
H_completed_jobs_dont_execute : completed_jobs_dont_execute sched
H6 : FP_policy Task
H_priority_is_reflexive : reflexive_priorities
H_priority_is_transitive : transitive_priorities
H_sequential_tasks : sequential_tasks arr_seq sched
H_work_conserving : work_conserving arr_seq sched
H_respects_policy : respects_policy_at_preemption_point arr_seq sched
rbf := task_request_bound_function : Task -> duration -> nat
task_rbf := rbf tsk : duration -> nat
total_hep_rbf := total_hep_request_bound_function_FP ts tsk
: duration -> nat
total_ohep_rbf := total_ohep_request_bound_function_FP ts tsk
: duration -> nat
blocking_bound := \max_(tsk_other <- ts | ~~ hep_task tsk_other tsk)
(task_max_nonpreemptive_segment tsk_other - ε) : nat
L : duration
H_L_positive : 0 < L
H_fixed_point : L = blocking_bound + total_hep_rbf L
is_in_search_space := bounded_pi.is_in_search_space tsk L : nat -> bool
R : nat
H_R_is_maximum : forall A : duration,
is_in_search_space A ->
exists F : duration,
A + F =
blocking_bound +
(task_rbf (A + ε) - (task_last_nonpr_segment tsk - ε)) +
total_ohep_rbf (A + F) /\
F + (task_last_nonpr_segment tsk - ε) <= R
response_time_bounded_by := task_response_time_bound arr_seq sched
: Task -> duration -> Prop
MLP : valid_limited_preemptions_job_model arr_seq
BEG : task_beginning_of_execution_in_preemption_points ts
END : task_end_of_execution_in_preemption_points ts
INCR : nondecreasing_task_preemption_points ts
HYP1 : consistent_job_segment_count arr_seq
HYP2 : job_respects_segment_lengths arr_seq
HYP3 : task_segments_are_nonempty ts
============================
response_time_bounded_by tsk R
----------------------------------------------------------------------------- *)
move: (MLP) ⇒ [BEGj [ENDj _]].
(* ----------------------------------[ coqtop ]---------------------------------
1 subgoal (ID 223)
Task : TaskType
H : TaskCost Task
Job : JobType
H0 : JobTask Job Task
H1 : JobArrival Job
H2 : JobCost Job
arr_seq : arrival_sequence Job
H_arrival_times_are_consistent : consistent_arrival_times arr_seq
H_arr_seq_is_a_set : arrival_sequence_uniq arr_seq
ts : seq Task
H_all_jobs_from_taskset : all_jobs_from_taskset arr_seq ts
H_valid_job_cost : arrivals_have_valid_job_costs arr_seq
H3 : JobPreemptionPoints Job
H4 : TaskPreemptionPoints Task
H_valid_model_with_fixed_preemption_points : valid_fixed_preemption_points_model
arr_seq ts
H5 : MaxArrivals Task
H_valid_arrival_curve : valid_taskset_arrival_curve ts max_arrivals
H_is_arrival_curve : taskset_respects_max_arrivals arr_seq ts
tsk : Task
H_tsk_in_ts : tsk \in ts
sched : schedule (processor_state Job)
H_jobs_come_from_arrival_sequence : jobs_come_from_arrival_sequence sched
arr_seq
H_schedule_respects_preemption_model : schedule_respects_preemption_model
arr_seq sched
H_jobs_must_arrive_to_execute : jobs_must_arrive_to_execute sched
H_completed_jobs_dont_execute : completed_jobs_dont_execute sched
H6 : FP_policy Task
H_priority_is_reflexive : reflexive_priorities
H_priority_is_transitive : transitive_priorities
H_sequential_tasks : sequential_tasks arr_seq sched
H_work_conserving : work_conserving arr_seq sched
H_respects_policy : respects_policy_at_preemption_point arr_seq sched
rbf := task_request_bound_function : Task -> duration -> nat
task_rbf := rbf tsk : duration -> nat
total_hep_rbf := total_hep_request_bound_function_FP ts tsk
: duration -> nat
total_ohep_rbf := total_ohep_request_bound_function_FP ts tsk
: duration -> nat
blocking_bound := \max_(tsk_other <- ts | ~~ hep_task tsk_other tsk)
(task_max_nonpreemptive_segment tsk_other - ε) : nat
L : duration
H_L_positive : 0 < L
H_fixed_point : L = blocking_bound + total_hep_rbf L
is_in_search_space := bounded_pi.is_in_search_space tsk L : nat -> bool
R : nat
H_R_is_maximum : forall A : duration,
is_in_search_space A ->
exists F : duration,
A + F =
blocking_bound +
(task_rbf (A + ε) - (task_last_nonpr_segment tsk - ε)) +
total_ohep_rbf (A + F) /\
F + (task_last_nonpr_segment tsk - ε) <= R
response_time_bounded_by := task_response_time_bound arr_seq sched
: Task -> duration -> Prop
MLP : valid_limited_preemptions_job_model arr_seq
BEG : task_beginning_of_execution_in_preemption_points ts
END : task_end_of_execution_in_preemption_points ts
INCR : nondecreasing_task_preemption_points ts
HYP1 : consistent_job_segment_count arr_seq
HYP2 : job_respects_segment_lengths arr_seq
HYP3 : task_segments_are_nonempty ts
BEGj : beginning_of_execution_in_preemption_points arr_seq
ENDj : end_of_execution_in_preemption_points arr_seq
============================
response_time_bounded_by tsk R
----------------------------------------------------------------------------- *)
edestruct (posnP (task_cost tsk)) as [ZERO|POSt].
(* ----------------------------------[ coqtop ]---------------------------------
2 subgoals (ID 248)
Task : TaskType
H : TaskCost Task
Job : JobType
H0 : JobTask Job Task
H1 : JobArrival Job
H2 : JobCost Job
arr_seq : arrival_sequence Job
H_arrival_times_are_consistent : consistent_arrival_times arr_seq
H_arr_seq_is_a_set : arrival_sequence_uniq arr_seq
ts : seq Task
H_all_jobs_from_taskset : all_jobs_from_taskset arr_seq ts
H_valid_job_cost : arrivals_have_valid_job_costs arr_seq
H3 : JobPreemptionPoints Job
H4 : TaskPreemptionPoints Task
H_valid_model_with_fixed_preemption_points : valid_fixed_preemption_points_model
arr_seq ts
H5 : MaxArrivals Task
H_valid_arrival_curve : valid_taskset_arrival_curve ts max_arrivals
H_is_arrival_curve : taskset_respects_max_arrivals arr_seq ts
tsk : Task
H_tsk_in_ts : tsk \in ts
sched : schedule (processor_state Job)
H_jobs_come_from_arrival_sequence : jobs_come_from_arrival_sequence sched
arr_seq
H_schedule_respects_preemption_model : schedule_respects_preemption_model
arr_seq sched
H_jobs_must_arrive_to_execute : jobs_must_arrive_to_execute sched
H_completed_jobs_dont_execute : completed_jobs_dont_execute sched
H6 : FP_policy Task
H_priority_is_reflexive : reflexive_priorities
H_priority_is_transitive : transitive_priorities
H_sequential_tasks : sequential_tasks arr_seq sched
H_work_conserving : work_conserving arr_seq sched
H_respects_policy : respects_policy_at_preemption_point arr_seq sched
rbf := task_request_bound_function : Task -> duration -> nat
task_rbf := rbf tsk : duration -> nat
total_hep_rbf := total_hep_request_bound_function_FP ts tsk
: duration -> nat
total_ohep_rbf := total_ohep_request_bound_function_FP ts tsk
: duration -> nat
blocking_bound := \max_(tsk_other <- ts | ~~ hep_task tsk_other tsk)
(task_max_nonpreemptive_segment tsk_other - ε) : nat
L : duration
H_L_positive : 0 < L
H_fixed_point : L = blocking_bound + total_hep_rbf L
is_in_search_space := bounded_pi.is_in_search_space tsk L : nat -> bool
R : nat
H_R_is_maximum : forall A : duration,
is_in_search_space A ->
exists F : duration,
A + F =
blocking_bound +
(task_rbf (A + ε) - (task_last_nonpr_segment tsk - ε)) +
total_ohep_rbf (A + F) /\
F + (task_last_nonpr_segment tsk - ε) <= R
response_time_bounded_by := task_response_time_bound arr_seq sched
: Task -> duration -> Prop
MLP : valid_limited_preemptions_job_model arr_seq
BEG : task_beginning_of_execution_in_preemption_points ts
END : task_end_of_execution_in_preemption_points ts
INCR : nondecreasing_task_preemption_points ts
HYP1 : consistent_job_segment_count arr_seq
HYP2 : job_respects_segment_lengths arr_seq
HYP3 : task_segments_are_nonempty ts
BEGj : beginning_of_execution_in_preemption_points arr_seq
ENDj : end_of_execution_in_preemption_points arr_seq
ZERO : task_cost tsk = 0
============================
response_time_bounded_by tsk R
subgoal 2 (ID 249) is:
response_time_bounded_by tsk R
----------------------------------------------------------------------------- *)
{
(* ----------------------------------[ coqtop ]---------------------------------
1 subgoal (ID 248)
Task : TaskType
H : TaskCost Task
Job : JobType
H0 : JobTask Job Task
H1 : JobArrival Job
H2 : JobCost Job
arr_seq : arrival_sequence Job
H_arrival_times_are_consistent : consistent_arrival_times arr_seq
H_arr_seq_is_a_set : arrival_sequence_uniq arr_seq
ts : seq Task
H_all_jobs_from_taskset : all_jobs_from_taskset arr_seq ts
H_valid_job_cost : arrivals_have_valid_job_costs arr_seq
H3 : JobPreemptionPoints Job
H4 : TaskPreemptionPoints Task
H_valid_model_with_fixed_preemption_points : valid_fixed_preemption_points_model
arr_seq ts
H5 : MaxArrivals Task
H_valid_arrival_curve : valid_taskset_arrival_curve ts max_arrivals
H_is_arrival_curve : taskset_respects_max_arrivals arr_seq ts
tsk : Task
H_tsk_in_ts : tsk \in ts
sched : schedule (processor_state Job)
H_jobs_come_from_arrival_sequence : jobs_come_from_arrival_sequence sched
arr_seq
H_schedule_respects_preemption_model : schedule_respects_preemption_model
arr_seq sched
H_jobs_must_arrive_to_execute : jobs_must_arrive_to_execute sched
H_completed_jobs_dont_execute : completed_jobs_dont_execute sched
H6 : FP_policy Task
H_priority_is_reflexive : reflexive_priorities
H_priority_is_transitive : transitive_priorities
H_sequential_tasks : sequential_tasks arr_seq sched
H_work_conserving : work_conserving arr_seq sched
H_respects_policy : respects_policy_at_preemption_point arr_seq sched
rbf := task_request_bound_function : Task -> duration -> nat
task_rbf := rbf tsk : duration -> nat
total_hep_rbf := total_hep_request_bound_function_FP ts tsk
: duration -> nat
total_ohep_rbf := total_ohep_request_bound_function_FP ts tsk
: duration -> nat
blocking_bound := \max_(tsk_other <- ts | ~~ hep_task tsk_other tsk)
(task_max_nonpreemptive_segment tsk_other - ε) : nat
L : duration
H_L_positive : 0 < L
H_fixed_point : L = blocking_bound + total_hep_rbf L
is_in_search_space := bounded_pi.is_in_search_space tsk L : nat -> bool
R : nat
H_R_is_maximum : forall A : duration,
is_in_search_space A ->
exists F : duration,
A + F =
blocking_bound +
(task_rbf (A + ε) - (task_last_nonpr_segment tsk - ε)) +
total_ohep_rbf (A + F) /\
F + (task_last_nonpr_segment tsk - ε) <= R
response_time_bounded_by := task_response_time_bound arr_seq sched
: Task -> duration -> Prop
MLP : valid_limited_preemptions_job_model arr_seq
BEG : task_beginning_of_execution_in_preemption_points ts
END : task_end_of_execution_in_preemption_points ts
INCR : nondecreasing_task_preemption_points ts
HYP1 : consistent_job_segment_count arr_seq
HYP2 : job_respects_segment_lengths arr_seq
HYP3 : task_segments_are_nonempty ts
BEGj : beginning_of_execution_in_preemption_points arr_seq
ENDj : end_of_execution_in_preemption_points arr_seq
ZERO : task_cost tsk = 0
============================
response_time_bounded_by tsk R
----------------------------------------------------------------------------- *)
intros j ARR TSK.
(* ----------------------------------[ coqtop ]---------------------------------
1 subgoal (ID 253)
Task : TaskType
H : TaskCost Task
Job : JobType
H0 : JobTask Job Task
H1 : JobArrival Job
H2 : JobCost Job
arr_seq : arrival_sequence Job
H_arrival_times_are_consistent : consistent_arrival_times arr_seq
H_arr_seq_is_a_set : arrival_sequence_uniq arr_seq
ts : seq Task
H_all_jobs_from_taskset : all_jobs_from_taskset arr_seq ts
H_valid_job_cost : arrivals_have_valid_job_costs arr_seq
H3 : JobPreemptionPoints Job
H4 : TaskPreemptionPoints Task
H_valid_model_with_fixed_preemption_points : valid_fixed_preemption_points_model
arr_seq ts
H5 : MaxArrivals Task
H_valid_arrival_curve : valid_taskset_arrival_curve ts max_arrivals
H_is_arrival_curve : taskset_respects_max_arrivals arr_seq ts
tsk : Task
H_tsk_in_ts : tsk \in ts
sched : schedule (processor_state Job)
H_jobs_come_from_arrival_sequence : jobs_come_from_arrival_sequence sched
arr_seq
H_schedule_respects_preemption_model : schedule_respects_preemption_model
arr_seq sched
H_jobs_must_arrive_to_execute : jobs_must_arrive_to_execute sched
H_completed_jobs_dont_execute : completed_jobs_dont_execute sched
H6 : FP_policy Task
H_priority_is_reflexive : reflexive_priorities
H_priority_is_transitive : transitive_priorities
H_sequential_tasks : sequential_tasks arr_seq sched
H_work_conserving : work_conserving arr_seq sched
H_respects_policy : respects_policy_at_preemption_point arr_seq sched
rbf := task_request_bound_function : Task -> duration -> nat
task_rbf := rbf tsk : duration -> nat
total_hep_rbf := total_hep_request_bound_function_FP ts tsk
: duration -> nat
total_ohep_rbf := total_ohep_request_bound_function_FP ts tsk
: duration -> nat
blocking_bound := \max_(tsk_other <- ts | ~~ hep_task tsk_other tsk)
(task_max_nonpreemptive_segment tsk_other - ε) : nat
L : duration
H_L_positive : 0 < L
H_fixed_point : L = blocking_bound + total_hep_rbf L
is_in_search_space := bounded_pi.is_in_search_space tsk L : nat -> bool
R : nat
H_R_is_maximum : forall A : duration,
is_in_search_space A ->
exists F : duration,
A + F =
blocking_bound +
(task_rbf (A + ε) - (task_last_nonpr_segment tsk - ε)) +
total_ohep_rbf (A + F) /\
F + (task_last_nonpr_segment tsk - ε) <= R
response_time_bounded_by := task_response_time_bound arr_seq sched
: Task -> duration -> Prop
MLP : valid_limited_preemptions_job_model arr_seq
BEG : task_beginning_of_execution_in_preemption_points ts
END : task_end_of_execution_in_preemption_points ts
INCR : nondecreasing_task_preemption_points ts
HYP1 : consistent_job_segment_count arr_seq
HYP2 : job_respects_segment_lengths arr_seq
HYP3 : task_segments_are_nonempty ts
BEGj : beginning_of_execution_in_preemption_points arr_seq
ENDj : end_of_execution_in_preemption_points arr_seq
ZERO : task_cost tsk = 0
j : Job
ARR : arrives_in arr_seq j
TSK : job_task j = tsk
============================
job_response_time_bound sched j R
----------------------------------------------------------------------------- *)
move: (H_valid_job_cost _ ARR) ⇒ POSt.
(* ----------------------------------[ coqtop ]---------------------------------
1 subgoal (ID 257)
Task : TaskType
H : TaskCost Task
Job : JobType
H0 : JobTask Job Task
H1 : JobArrival Job
H2 : JobCost Job
arr_seq : arrival_sequence Job
H_arrival_times_are_consistent : consistent_arrival_times arr_seq
H_arr_seq_is_a_set : arrival_sequence_uniq arr_seq
ts : seq Task
H_all_jobs_from_taskset : all_jobs_from_taskset arr_seq ts
H_valid_job_cost : arrivals_have_valid_job_costs arr_seq
H3 : JobPreemptionPoints Job
H4 : TaskPreemptionPoints Task
H_valid_model_with_fixed_preemption_points : valid_fixed_preemption_points_model
arr_seq ts
H5 : MaxArrivals Task
H_valid_arrival_curve : valid_taskset_arrival_curve ts max_arrivals
H_is_arrival_curve : taskset_respects_max_arrivals arr_seq ts
tsk : Task
H_tsk_in_ts : tsk \in ts
sched : schedule (processor_state Job)
H_jobs_come_from_arrival_sequence : jobs_come_from_arrival_sequence sched
arr_seq
H_schedule_respects_preemption_model : schedule_respects_preemption_model
arr_seq sched
H_jobs_must_arrive_to_execute : jobs_must_arrive_to_execute sched
H_completed_jobs_dont_execute : completed_jobs_dont_execute sched
H6 : FP_policy Task
H_priority_is_reflexive : reflexive_priorities
H_priority_is_transitive : transitive_priorities
H_sequential_tasks : sequential_tasks arr_seq sched
H_work_conserving : work_conserving arr_seq sched
H_respects_policy : respects_policy_at_preemption_point arr_seq sched
rbf := task_request_bound_function : Task -> duration -> nat
task_rbf := rbf tsk : duration -> nat
total_hep_rbf := total_hep_request_bound_function_FP ts tsk
: duration -> nat
total_ohep_rbf := total_ohep_request_bound_function_FP ts tsk
: duration -> nat
blocking_bound := \max_(tsk_other <- ts | ~~ hep_task tsk_other tsk)
(task_max_nonpreemptive_segment tsk_other - ε) : nat
L : duration
H_L_positive : 0 < L
H_fixed_point : L = blocking_bound + total_hep_rbf L
is_in_search_space := bounded_pi.is_in_search_space tsk L : nat -> bool
R : nat
H_R_is_maximum : forall A : duration,
is_in_search_space A ->
exists F : duration,
A + F =
blocking_bound +
(task_rbf (A + ε) - (task_last_nonpr_segment tsk - ε)) +
total_ohep_rbf (A + F) /\
F + (task_last_nonpr_segment tsk - ε) <= R
response_time_bounded_by := task_response_time_bound arr_seq sched
: Task -> duration -> Prop
MLP : valid_limited_preemptions_job_model arr_seq
BEG : task_beginning_of_execution_in_preemption_points ts
END : task_end_of_execution_in_preemption_points ts
INCR : nondecreasing_task_preemption_points ts
HYP1 : consistent_job_segment_count arr_seq
HYP2 : job_respects_segment_lengths arr_seq
HYP3 : task_segments_are_nonempty ts
BEGj : beginning_of_execution_in_preemption_points arr_seq
ENDj : end_of_execution_in_preemption_points arr_seq
ZERO : task_cost tsk = 0
j : Job
ARR : arrives_in arr_seq j
TSK : job_task j = tsk
POSt : valid_job_cost j
============================
job_response_time_bound sched j R
----------------------------------------------------------------------------- *)
move: POSt; rewrite /valid_job_cost TSK ZERO leqn0; move ⇒ /eqP Z.
(* ----------------------------------[ coqtop ]---------------------------------
1 subgoal (ID 310)
Task : TaskType
H : TaskCost Task
Job : JobType
H0 : JobTask Job Task
H1 : JobArrival Job
H2 : JobCost Job
arr_seq : arrival_sequence Job
H_arrival_times_are_consistent : consistent_arrival_times arr_seq
H_arr_seq_is_a_set : arrival_sequence_uniq arr_seq
ts : seq Task
H_all_jobs_from_taskset : all_jobs_from_taskset arr_seq ts
H_valid_job_cost : arrivals_have_valid_job_costs arr_seq
H3 : JobPreemptionPoints Job
H4 : TaskPreemptionPoints Task
H_valid_model_with_fixed_preemption_points : valid_fixed_preemption_points_model
arr_seq ts
H5 : MaxArrivals Task
H_valid_arrival_curve : valid_taskset_arrival_curve ts max_arrivals
H_is_arrival_curve : taskset_respects_max_arrivals arr_seq ts
tsk : Task
H_tsk_in_ts : tsk \in ts
sched : schedule (processor_state Job)
H_jobs_come_from_arrival_sequence : jobs_come_from_arrival_sequence sched
arr_seq
H_schedule_respects_preemption_model : schedule_respects_preemption_model
arr_seq sched
H_jobs_must_arrive_to_execute : jobs_must_arrive_to_execute sched
H_completed_jobs_dont_execute : completed_jobs_dont_execute sched
H6 : FP_policy Task
H_priority_is_reflexive : reflexive_priorities
H_priority_is_transitive : transitive_priorities
H_sequential_tasks : sequential_tasks arr_seq sched
H_work_conserving : work_conserving arr_seq sched
H_respects_policy : respects_policy_at_preemption_point arr_seq sched
rbf := task_request_bound_function : Task -> duration -> nat
task_rbf := rbf tsk : duration -> nat
total_hep_rbf := total_hep_request_bound_function_FP ts tsk
: duration -> nat
total_ohep_rbf := total_ohep_request_bound_function_FP ts tsk
: duration -> nat
blocking_bound := \max_(tsk_other <- ts | ~~ hep_task tsk_other tsk)
(task_max_nonpreemptive_segment tsk_other - ε) : nat
L : duration
H_L_positive : 0 < L
H_fixed_point : L = blocking_bound + total_hep_rbf L
is_in_search_space := bounded_pi.is_in_search_space tsk L : nat -> bool
R : nat
H_R_is_maximum : forall A : duration,
is_in_search_space A ->
exists F : duration,
A + F =
blocking_bound +
(task_rbf (A + ε) - (task_last_nonpr_segment tsk - ε)) +
total_ohep_rbf (A + F) /\
F + (task_last_nonpr_segment tsk - ε) <= R
response_time_bounded_by := task_response_time_bound arr_seq sched
: Task -> duration -> Prop
MLP : valid_limited_preemptions_job_model arr_seq
BEG : task_beginning_of_execution_in_preemption_points ts
END : task_end_of_execution_in_preemption_points ts
INCR : nondecreasing_task_preemption_points ts
HYP1 : consistent_job_segment_count arr_seq
HYP2 : job_respects_segment_lengths arr_seq
HYP3 : task_segments_are_nonempty ts
BEGj : beginning_of_execution_in_preemption_points arr_seq
ENDj : end_of_execution_in_preemption_points arr_seq
ZERO : task_cost tsk = 0
j : Job
ARR : arrives_in arr_seq j
TSK : job_task j = tsk
Z : job_cost j = 0
============================
job_response_time_bound sched j R
----------------------------------------------------------------------------- *)
by rewrite /job_response_time_bound /completed_by Z.
(* ----------------------------------[ coqtop ]---------------------------------
1 subgoal
subgoal 1 (ID 249) is:
response_time_bounded_by tsk R
----------------------------------------------------------------------------- *)
}
(* ----------------------------------[ coqtop ]---------------------------------
1 subgoal (ID 249)
Task : TaskType
H : TaskCost Task
Job : JobType
H0 : JobTask Job Task
H1 : JobArrival Job
H2 : JobCost Job
arr_seq : arrival_sequence Job
H_arrival_times_are_consistent : consistent_arrival_times arr_seq
H_arr_seq_is_a_set : arrival_sequence_uniq arr_seq
ts : seq Task
H_all_jobs_from_taskset : all_jobs_from_taskset arr_seq ts
H_valid_job_cost : arrivals_have_valid_job_costs arr_seq
H3 : JobPreemptionPoints Job
H4 : TaskPreemptionPoints Task
H_valid_model_with_fixed_preemption_points : valid_fixed_preemption_points_model
arr_seq ts
H5 : MaxArrivals Task
H_valid_arrival_curve : valid_taskset_arrival_curve ts max_arrivals
H_is_arrival_curve : taskset_respects_max_arrivals arr_seq ts
tsk : Task
H_tsk_in_ts : tsk \in ts
sched : schedule (processor_state Job)
H_jobs_come_from_arrival_sequence : jobs_come_from_arrival_sequence sched
arr_seq
H_schedule_respects_preemption_model : schedule_respects_preemption_model
arr_seq sched
H_jobs_must_arrive_to_execute : jobs_must_arrive_to_execute sched
H_completed_jobs_dont_execute : completed_jobs_dont_execute sched
H6 : FP_policy Task
H_priority_is_reflexive : reflexive_priorities
H_priority_is_transitive : transitive_priorities
H_sequential_tasks : sequential_tasks arr_seq sched
H_work_conserving : work_conserving arr_seq sched
H_respects_policy : respects_policy_at_preemption_point arr_seq sched
rbf := task_request_bound_function : Task -> duration -> nat
task_rbf := rbf tsk : duration -> nat
total_hep_rbf := total_hep_request_bound_function_FP ts tsk
: duration -> nat
total_ohep_rbf := total_ohep_request_bound_function_FP ts tsk
: duration -> nat
blocking_bound := \max_(tsk_other <- ts | ~~ hep_task tsk_other tsk)
(task_max_nonpreemptive_segment tsk_other - ε) : nat
L : duration
H_L_positive : 0 < L
H_fixed_point : L = blocking_bound + total_hep_rbf L
is_in_search_space := bounded_pi.is_in_search_space tsk L : nat -> bool
R : nat
H_R_is_maximum : forall A : duration,
is_in_search_space A ->
exists F : duration,
A + F =
blocking_bound +
(task_rbf (A + ε) - (task_last_nonpr_segment tsk - ε)) +
total_ohep_rbf (A + F) /\
F + (task_last_nonpr_segment tsk - ε) <= R
response_time_bounded_by := task_response_time_bound arr_seq sched
: Task -> duration -> Prop
MLP : valid_limited_preemptions_job_model arr_seq
BEG : task_beginning_of_execution_in_preemption_points ts
END : task_end_of_execution_in_preemption_points ts
INCR : nondecreasing_task_preemption_points ts
HYP1 : consistent_job_segment_count arr_seq
HYP2 : job_respects_segment_lengths arr_seq
HYP3 : task_segments_are_nonempty ts
BEGj : beginning_of_execution_in_preemption_points arr_seq
ENDj : end_of_execution_in_preemption_points arr_seq
POSt : 0 < task_cost tsk
============================
response_time_bounded_by tsk R
----------------------------------------------------------------------------- *)
eapply uniprocessor_response_time_bound_fp_with_bounded_nonpreemptive_segments
with (L0 := L).
(* ----------------------------------[ coqtop ]---------------------------------
21 focused subgoals
(shelved: 1) (ID 343)
Task : TaskType
H : TaskCost Task
Job : JobType
H0 : JobTask Job Task
H1 : JobArrival Job
H2 : JobCost Job
arr_seq : arrival_sequence Job
H_arrival_times_are_consistent : consistent_arrival_times arr_seq
H_arr_seq_is_a_set : arrival_sequence_uniq arr_seq
ts : seq Task
H_all_jobs_from_taskset : all_jobs_from_taskset arr_seq ts
H_valid_job_cost : arrivals_have_valid_job_costs arr_seq
H3 : JobPreemptionPoints Job
H4 : TaskPreemptionPoints Task
H_valid_model_with_fixed_preemption_points : valid_fixed_preemption_points_model
arr_seq ts
H5 : MaxArrivals Task
H_valid_arrival_curve : valid_taskset_arrival_curve ts max_arrivals
H_is_arrival_curve : taskset_respects_max_arrivals arr_seq ts
tsk : Task
H_tsk_in_ts : tsk \in ts
sched : schedule (processor_state Job)
H_jobs_come_from_arrival_sequence : jobs_come_from_arrival_sequence sched
arr_seq
H_schedule_respects_preemption_model : schedule_respects_preemption_model
arr_seq sched
H_jobs_must_arrive_to_execute : jobs_must_arrive_to_execute sched
H_completed_jobs_dont_execute : completed_jobs_dont_execute sched
H6 : FP_policy Task
H_priority_is_reflexive : reflexive_priorities
H_priority_is_transitive : transitive_priorities
H_sequential_tasks : sequential_tasks arr_seq sched
H_work_conserving : work_conserving arr_seq sched
H_respects_policy : respects_policy_at_preemption_point arr_seq sched
rbf := task_request_bound_function : Task -> duration -> nat
task_rbf := rbf tsk : duration -> nat
total_hep_rbf := total_hep_request_bound_function_FP ts tsk
: duration -> nat
total_ohep_rbf := total_ohep_request_bound_function_FP ts tsk
: duration -> nat
blocking_bound := \max_(tsk_other <- ts | ~~ hep_task tsk_other tsk)
(task_max_nonpreemptive_segment tsk_other - ε) : nat
L : duration
H_L_positive : 0 < L
H_fixed_point : L = blocking_bound + total_hep_rbf L
is_in_search_space := bounded_pi.is_in_search_space tsk L : nat -> bool
R : nat
H_R_is_maximum : forall A : duration,
is_in_search_space A ->
exists F : duration,
A + F =
blocking_bound +
(task_rbf (A + ε) - (task_last_nonpr_segment tsk - ε)) +
total_ohep_rbf (A + F) /\
F + (task_last_nonpr_segment tsk - ε) <= R
response_time_bounded_by := task_response_time_bound arr_seq sched
: Task -> duration -> Prop
MLP : valid_limited_preemptions_job_model arr_seq
BEG : task_beginning_of_execution_in_preemption_points ts
END : task_end_of_execution_in_preemption_points ts
INCR : nondecreasing_task_preemption_points ts
HYP1 : consistent_job_segment_count arr_seq
HYP2 : job_respects_segment_lengths arr_seq
HYP3 : task_segments_are_nonempty ts
BEGj : beginning_of_execution_in_preemption_points arr_seq
ENDj : end_of_execution_in_preemption_points arr_seq
POSt : 0 < task_cost tsk
============================
consistent_arrival_times arr_seq
subgoal 2 (ID 344) is:
arrival_sequence_uniq arr_seq
subgoal 3 (ID 345) is:
jobs_come_from_arrival_sequence sched arr_seq
subgoal 4 (ID 346) is:
jobs_must_arrive_to_execute sched
subgoal 5 (ID 347) is:
completed_jobs_dont_execute sched
subgoal 6 (ID 348) is:
valid_model_with_bounded_nonpreemptive_segments arr_seq sched
subgoal 7 (ID 349) is:
reflexive_priorities
subgoal 8 (ID 350) is:
transitive_priorities
subgoal 9 (ID 351) is:
sequential_tasks arr_seq sched
subgoal 10 (ID 352) is:
work_conserving arr_seq sched
subgoal 11 (ID 353) is:
respects_policy_at_preemption_point arr_seq sched
subgoal 12 (ID 354) is:
all_jobs_from_taskset arr_seq ?ts0
subgoal 13 (ID 355) is:
arrivals_have_valid_job_costs arr_seq
subgoal 14 (ID 356) is:
valid_taskset_arrival_curve ?ts0 max_arrivals
subgoal 15 (ID 357) is:
taskset_respects_max_arrivals arr_seq ?ts0
subgoal 16 (ID 358) is:
tsk \in ?ts0
subgoal 17 (ID 359) is:
valid_preemption_model arr_seq sched
subgoal 18 (ID 360) is:
valid_task_run_to_completion_threshold arr_seq tsk
subgoal 19 (ID 361) is:
0 < L
subgoal 20 (ID 362) is:
L =
bounded_nps.blocking_bound ?ts0 tsk +
total_hep_request_bound_function_FP ?ts0 tsk L
subgoal 21 (ID 363) is:
forall A : duration,
bounded_pi.is_in_search_space tsk L A ->
exists F : duration,
A + F =
bounded_nps.blocking_bound ?ts0 tsk +
(task_request_bound_function tsk (A + ε) - (task_cost tsk - task_rtct tsk)) +
total_ohep_request_bound_function_FP ?ts0 tsk (A + F) /\
F + (task_cost tsk - task_rtct tsk) <= R
----------------------------------------------------------------------------- *)
all: eauto 2 with basic_facts.
(* ----------------------------------[ coqtop ]---------------------------------
1 subgoal (ID 363)
Task : TaskType
H : TaskCost Task
Job : JobType
H0 : JobTask Job Task
H1 : JobArrival Job
H2 : JobCost Job
arr_seq : arrival_sequence Job
H_arrival_times_are_consistent : consistent_arrival_times arr_seq
H_arr_seq_is_a_set : arrival_sequence_uniq arr_seq
ts : seq Task
H_all_jobs_from_taskset : all_jobs_from_taskset arr_seq ts
H_valid_job_cost : arrivals_have_valid_job_costs arr_seq
H3 : JobPreemptionPoints Job
H4 : TaskPreemptionPoints Task
H_valid_model_with_fixed_preemption_points : valid_fixed_preemption_points_model
arr_seq ts
H5 : MaxArrivals Task
H_valid_arrival_curve : valid_taskset_arrival_curve ts max_arrivals
H_is_arrival_curve : taskset_respects_max_arrivals arr_seq ts
tsk : Task
H_tsk_in_ts : tsk \in ts
sched : schedule (processor_state Job)
H_jobs_come_from_arrival_sequence : jobs_come_from_arrival_sequence sched
arr_seq
H_schedule_respects_preemption_model : schedule_respects_preemption_model
arr_seq sched
H_jobs_must_arrive_to_execute : jobs_must_arrive_to_execute sched
H_completed_jobs_dont_execute : completed_jobs_dont_execute sched
H6 : FP_policy Task
H_priority_is_reflexive : reflexive_priorities
H_priority_is_transitive : transitive_priorities
H_sequential_tasks : sequential_tasks arr_seq sched
H_work_conserving : work_conserving arr_seq sched
H_respects_policy : respects_policy_at_preemption_point arr_seq sched
rbf := task_request_bound_function : Task -> duration -> nat
task_rbf := rbf tsk : duration -> nat
total_hep_rbf := total_hep_request_bound_function_FP ts tsk
: duration -> nat
total_ohep_rbf := total_ohep_request_bound_function_FP ts tsk
: duration -> nat
blocking_bound := \max_(tsk_other <- ts | ~~ hep_task tsk_other tsk)
(task_max_nonpreemptive_segment tsk_other - ε) : nat
L : duration
H_L_positive : 0 < L
H_fixed_point : L = blocking_bound + total_hep_rbf L
is_in_search_space := bounded_pi.is_in_search_space tsk L : nat -> bool
R : nat
H_R_is_maximum : forall A : duration,
is_in_search_space A ->
exists F : duration,
A + F =
blocking_bound +
(task_rbf (A + ε) - (task_last_nonpr_segment tsk - ε)) +
total_ohep_rbf (A + F) /\
F + (task_last_nonpr_segment tsk - ε) <= R
response_time_bounded_by := task_response_time_bound arr_seq sched
: Task -> duration -> Prop
MLP : valid_limited_preemptions_job_model arr_seq
BEG : task_beginning_of_execution_in_preemption_points ts
END : task_end_of_execution_in_preemption_points ts
INCR : nondecreasing_task_preemption_points ts
HYP1 : consistent_job_segment_count arr_seq
HYP2 : job_respects_segment_lengths arr_seq
HYP3 : task_segments_are_nonempty ts
BEGj : beginning_of_execution_in_preemption_points arr_seq
ENDj : end_of_execution_in_preemption_points arr_seq
POSt : 0 < task_cost tsk
============================
forall A : duration,
bounded_pi.is_in_search_space tsk L A ->
exists F : duration,
A + F =
bounded_nps.blocking_bound ts tsk +
(task_request_bound_function tsk (A + ε) -
(task_cost tsk - task_rtct tsk)) +
total_ohep_request_bound_function_FP ts tsk (A + F) /\
F + (task_cost tsk - task_rtct tsk) <= R
----------------------------------------------------------------------------- *)
intros A SP.
(* ----------------------------------[ coqtop ]---------------------------------
1 subgoal (ID 397)
Task : TaskType
H : TaskCost Task
Job : JobType
H0 : JobTask Job Task
H1 : JobArrival Job
H2 : JobCost Job
arr_seq : arrival_sequence Job
H_arrival_times_are_consistent : consistent_arrival_times arr_seq
H_arr_seq_is_a_set : arrival_sequence_uniq arr_seq
ts : seq Task
H_all_jobs_from_taskset : all_jobs_from_taskset arr_seq ts
H_valid_job_cost : arrivals_have_valid_job_costs arr_seq
H3 : JobPreemptionPoints Job
H4 : TaskPreemptionPoints Task
H_valid_model_with_fixed_preemption_points : valid_fixed_preemption_points_model
arr_seq ts
H5 : MaxArrivals Task
H_valid_arrival_curve : valid_taskset_arrival_curve ts max_arrivals
H_is_arrival_curve : taskset_respects_max_arrivals arr_seq ts
tsk : Task
H_tsk_in_ts : tsk \in ts
sched : schedule (processor_state Job)
H_jobs_come_from_arrival_sequence : jobs_come_from_arrival_sequence sched
arr_seq
H_schedule_respects_preemption_model : schedule_respects_preemption_model
arr_seq sched
H_jobs_must_arrive_to_execute : jobs_must_arrive_to_execute sched
H_completed_jobs_dont_execute : completed_jobs_dont_execute sched
H6 : FP_policy Task
H_priority_is_reflexive : reflexive_priorities
H_priority_is_transitive : transitive_priorities
H_sequential_tasks : sequential_tasks arr_seq sched
H_work_conserving : work_conserving arr_seq sched
H_respects_policy : respects_policy_at_preemption_point arr_seq sched
rbf := task_request_bound_function : Task -> duration -> nat
task_rbf := rbf tsk : duration -> nat
total_hep_rbf := total_hep_request_bound_function_FP ts tsk
: duration -> nat
total_ohep_rbf := total_ohep_request_bound_function_FP ts tsk
: duration -> nat
blocking_bound := \max_(tsk_other <- ts | ~~ hep_task tsk_other tsk)
(task_max_nonpreemptive_segment tsk_other - ε) : nat
L : duration
H_L_positive : 0 < L
H_fixed_point : L = blocking_bound + total_hep_rbf L
is_in_search_space := bounded_pi.is_in_search_space tsk L : nat -> bool
R : nat
H_R_is_maximum : forall A : duration,
is_in_search_space A ->
exists F : duration,
A + F =
blocking_bound +
(task_rbf (A + ε) - (task_last_nonpr_segment tsk - ε)) +
total_ohep_rbf (A + F) /\
F + (task_last_nonpr_segment tsk - ε) <= R
response_time_bounded_by := task_response_time_bound arr_seq sched
: Task -> duration -> Prop
MLP : valid_limited_preemptions_job_model arr_seq
BEG : task_beginning_of_execution_in_preemption_points ts
END : task_end_of_execution_in_preemption_points ts
INCR : nondecreasing_task_preemption_points ts
HYP1 : consistent_job_segment_count arr_seq
HYP2 : job_respects_segment_lengths arr_seq
HYP3 : task_segments_are_nonempty ts
BEGj : beginning_of_execution_in_preemption_points arr_seq
ENDj : end_of_execution_in_preemption_points arr_seq
POSt : 0 < task_cost tsk
A : duration
SP : bounded_pi.is_in_search_space tsk L A
============================
exists F : duration,
A + F =
bounded_nps.blocking_bound ts tsk +
(task_request_bound_function tsk (A + ε) -
(task_cost tsk - task_rtct tsk)) +
total_ohep_request_bound_function_FP ts tsk (A + F) /\
F + (task_cost tsk - task_rtct tsk) <= R
----------------------------------------------------------------------------- *)
destruct (H_R_is_maximum _ SP) as[FF [EQ1 EQ2]].
(* ----------------------------------[ coqtop ]---------------------------------
1 subgoal (ID 409)
Task : TaskType
H : TaskCost Task
Job : JobType
H0 : JobTask Job Task
H1 : JobArrival Job
H2 : JobCost Job
arr_seq : arrival_sequence Job
H_arrival_times_are_consistent : consistent_arrival_times arr_seq
H_arr_seq_is_a_set : arrival_sequence_uniq arr_seq
ts : seq Task
H_all_jobs_from_taskset : all_jobs_from_taskset arr_seq ts
H_valid_job_cost : arrivals_have_valid_job_costs arr_seq
H3 : JobPreemptionPoints Job
H4 : TaskPreemptionPoints Task
H_valid_model_with_fixed_preemption_points : valid_fixed_preemption_points_model
arr_seq ts
H5 : MaxArrivals Task
H_valid_arrival_curve : valid_taskset_arrival_curve ts max_arrivals
H_is_arrival_curve : taskset_respects_max_arrivals arr_seq ts
tsk : Task
H_tsk_in_ts : tsk \in ts
sched : schedule (processor_state Job)
H_jobs_come_from_arrival_sequence : jobs_come_from_arrival_sequence sched
arr_seq
H_schedule_respects_preemption_model : schedule_respects_preemption_model
arr_seq sched
H_jobs_must_arrive_to_execute : jobs_must_arrive_to_execute sched
H_completed_jobs_dont_execute : completed_jobs_dont_execute sched
H6 : FP_policy Task
H_priority_is_reflexive : reflexive_priorities
H_priority_is_transitive : transitive_priorities
H_sequential_tasks : sequential_tasks arr_seq sched
H_work_conserving : work_conserving arr_seq sched
H_respects_policy : respects_policy_at_preemption_point arr_seq sched
rbf := task_request_bound_function : Task -> duration -> nat
task_rbf := rbf tsk : duration -> nat
total_hep_rbf := total_hep_request_bound_function_FP ts tsk
: duration -> nat
total_ohep_rbf := total_ohep_request_bound_function_FP ts tsk
: duration -> nat
blocking_bound := \max_(tsk_other <- ts | ~~ hep_task tsk_other tsk)
(task_max_nonpreemptive_segment tsk_other - ε) : nat
L : duration
H_L_positive : 0 < L
H_fixed_point : L = blocking_bound + total_hep_rbf L
is_in_search_space := bounded_pi.is_in_search_space tsk L : nat -> bool
R : nat
H_R_is_maximum : forall A : duration,
is_in_search_space A ->
exists F : duration,
A + F =
blocking_bound +
(task_rbf (A + ε) - (task_last_nonpr_segment tsk - ε)) +
total_ohep_rbf (A + F) /\
F + (task_last_nonpr_segment tsk - ε) <= R
response_time_bounded_by := task_response_time_bound arr_seq sched
: Task -> duration -> Prop
MLP : valid_limited_preemptions_job_model arr_seq
BEG : task_beginning_of_execution_in_preemption_points ts
END : task_end_of_execution_in_preemption_points ts
INCR : nondecreasing_task_preemption_points ts
HYP1 : consistent_job_segment_count arr_seq
HYP2 : job_respects_segment_lengths arr_seq
HYP3 : task_segments_are_nonempty ts
BEGj : beginning_of_execution_in_preemption_points arr_seq
ENDj : end_of_execution_in_preemption_points arr_seq
POSt : 0 < task_cost tsk
A : duration
SP : bounded_pi.is_in_search_space tsk L A
FF : duration
EQ1 : A + FF =
blocking_bound +
(task_rbf (A + ε) - (task_last_nonpr_segment tsk - ε)) +
total_ohep_rbf (A + FF)
EQ2 : FF + (task_last_nonpr_segment tsk - ε) <= R
============================
exists F : duration,
A + F =
bounded_nps.blocking_bound ts tsk +
(task_request_bound_function tsk (A + ε) -
(task_cost tsk - task_rtct tsk)) +
total_ohep_request_bound_function_FP ts tsk (A + F) /\
F + (task_cost tsk - task_rtct tsk) <= R
----------------------------------------------------------------------------- *)
∃ FF; rewrite subKn; first by done.
(* ----------------------------------[ coqtop ]---------------------------------
1 subgoal (ID 417)
Task : TaskType
H : TaskCost Task
Job : JobType
H0 : JobTask Job Task
H1 : JobArrival Job
H2 : JobCost Job
arr_seq : arrival_sequence Job
H_arrival_times_are_consistent : consistent_arrival_times arr_seq
H_arr_seq_is_a_set : arrival_sequence_uniq arr_seq
ts : seq Task
H_all_jobs_from_taskset : all_jobs_from_taskset arr_seq ts
H_valid_job_cost : arrivals_have_valid_job_costs arr_seq
H3 : JobPreemptionPoints Job
H4 : TaskPreemptionPoints Task
H_valid_model_with_fixed_preemption_points : valid_fixed_preemption_points_model
arr_seq ts
H5 : MaxArrivals Task
H_valid_arrival_curve : valid_taskset_arrival_curve ts max_arrivals
H_is_arrival_curve : taskset_respects_max_arrivals arr_seq ts
tsk : Task
H_tsk_in_ts : tsk \in ts
sched : schedule (processor_state Job)
H_jobs_come_from_arrival_sequence : jobs_come_from_arrival_sequence sched
arr_seq
H_schedule_respects_preemption_model : schedule_respects_preemption_model
arr_seq sched
H_jobs_must_arrive_to_execute : jobs_must_arrive_to_execute sched
H_completed_jobs_dont_execute : completed_jobs_dont_execute sched
H6 : FP_policy Task
H_priority_is_reflexive : reflexive_priorities
H_priority_is_transitive : transitive_priorities
H_sequential_tasks : sequential_tasks arr_seq sched
H_work_conserving : work_conserving arr_seq sched
H_respects_policy : respects_policy_at_preemption_point arr_seq sched
rbf := task_request_bound_function : Task -> duration -> nat
task_rbf := rbf tsk : duration -> nat
total_hep_rbf := total_hep_request_bound_function_FP ts tsk
: duration -> nat
total_ohep_rbf := total_ohep_request_bound_function_FP ts tsk
: duration -> nat
blocking_bound := \max_(tsk_other <- ts | ~~ hep_task tsk_other tsk)
(task_max_nonpreemptive_segment tsk_other - ε) : nat
L : duration
H_L_positive : 0 < L
H_fixed_point : L = blocking_bound + total_hep_rbf L
is_in_search_space := bounded_pi.is_in_search_space tsk L : nat -> bool
R : nat
H_R_is_maximum : forall A : duration,
is_in_search_space A ->
exists F : duration,
A + F =
blocking_bound +
(task_rbf (A + ε) - (task_last_nonpr_segment tsk - ε)) +
total_ohep_rbf (A + F) /\
F + (task_last_nonpr_segment tsk - ε) <= R
response_time_bounded_by := task_response_time_bound arr_seq sched
: Task -> duration -> Prop
MLP : valid_limited_preemptions_job_model arr_seq
BEG : task_beginning_of_execution_in_preemption_points ts
END : task_end_of_execution_in_preemption_points ts
INCR : nondecreasing_task_preemption_points ts
HYP1 : consistent_job_segment_count arr_seq
HYP2 : job_respects_segment_lengths arr_seq
HYP3 : task_segments_are_nonempty ts
BEGj : beginning_of_execution_in_preemption_points arr_seq
ENDj : end_of_execution_in_preemption_points arr_seq
POSt : 0 < task_cost tsk
A : duration
SP : bounded_pi.is_in_search_space tsk L A
FF : duration
EQ1 : A + FF =
blocking_bound +
(task_rbf (A + ε) - (task_last_nonpr_segment tsk - ε)) +
total_ohep_rbf (A + FF)
EQ2 : FF + (task_last_nonpr_segment tsk - ε) <= R
============================
task_last_nonpr_segment tsk - ε <= task_cost tsk
----------------------------------------------------------------------------- *)
rewrite /task_last_nonpr_segment -(leq_add2r 1) subn1 !addn1 prednK; last first.
(* ----------------------------------[ coqtop ]---------------------------------
2 subgoals (ID 468)
Task : TaskType
H : TaskCost Task
Job : JobType
H0 : JobTask Job Task
H1 : JobArrival Job
H2 : JobCost Job
arr_seq : arrival_sequence Job
H_arrival_times_are_consistent : consistent_arrival_times arr_seq
H_arr_seq_is_a_set : arrival_sequence_uniq arr_seq
ts : seq Task
H_all_jobs_from_taskset : all_jobs_from_taskset arr_seq ts
H_valid_job_cost : arrivals_have_valid_job_costs arr_seq
H3 : JobPreemptionPoints Job
H4 : TaskPreemptionPoints Task
H_valid_model_with_fixed_preemption_points : valid_fixed_preemption_points_model
arr_seq ts
H5 : MaxArrivals Task
H_valid_arrival_curve : valid_taskset_arrival_curve ts max_arrivals
H_is_arrival_curve : taskset_respects_max_arrivals arr_seq ts
tsk : Task
H_tsk_in_ts : tsk \in ts
sched : schedule (processor_state Job)
H_jobs_come_from_arrival_sequence : jobs_come_from_arrival_sequence sched
arr_seq
H_schedule_respects_preemption_model : schedule_respects_preemption_model
arr_seq sched
H_jobs_must_arrive_to_execute : jobs_must_arrive_to_execute sched
H_completed_jobs_dont_execute : completed_jobs_dont_execute sched
H6 : FP_policy Task
H_priority_is_reflexive : reflexive_priorities
H_priority_is_transitive : transitive_priorities
H_sequential_tasks : sequential_tasks arr_seq sched
H_work_conserving : work_conserving arr_seq sched
H_respects_policy : respects_policy_at_preemption_point arr_seq sched
rbf := task_request_bound_function : Task -> duration -> nat
task_rbf := rbf tsk : duration -> nat
total_hep_rbf := total_hep_request_bound_function_FP ts tsk
: duration -> nat
total_ohep_rbf := total_ohep_request_bound_function_FP ts tsk
: duration -> nat
blocking_bound := \max_(tsk_other <- ts | ~~ hep_task tsk_other tsk)
(task_max_nonpreemptive_segment tsk_other - ε) : nat
L : duration
H_L_positive : 0 < L
H_fixed_point : L = blocking_bound + total_hep_rbf L
is_in_search_space := bounded_pi.is_in_search_space tsk L : nat -> bool
R : nat
H_R_is_maximum : forall A : duration,
is_in_search_space A ->
exists F : duration,
A + F =
blocking_bound +
(task_rbf (A + ε) - (task_last_nonpr_segment tsk - ε)) +
total_ohep_rbf (A + F) /\
F + (task_last_nonpr_segment tsk - ε) <= R
response_time_bounded_by := task_response_time_bound arr_seq sched
: Task -> duration -> Prop
MLP : valid_limited_preemptions_job_model arr_seq
BEG : task_beginning_of_execution_in_preemption_points ts
END : task_end_of_execution_in_preemption_points ts
INCR : nondecreasing_task_preemption_points ts
HYP1 : consistent_job_segment_count arr_seq
HYP2 : job_respects_segment_lengths arr_seq
HYP3 : task_segments_are_nonempty ts
BEGj : beginning_of_execution_in_preemption_points arr_seq
ENDj : end_of_execution_in_preemption_points arr_seq
POSt : 0 < task_cost tsk
A : duration
SP : bounded_pi.is_in_search_space tsk L A
FF : duration
EQ1 : A + FF =
blocking_bound +
(task_rbf (A + ε) - (task_last_nonpr_segment tsk - ε)) +
total_ohep_rbf (A + FF)
EQ2 : FF + (task_last_nonpr_segment tsk - ε) <= R
============================
0 < last0 (distances (task_preemption_points tsk))
subgoal 2 (ID 467) is:
last0 (distances (task_preemption_points tsk)) <= (task_cost tsk).+1
----------------------------------------------------------------------------- *)
- rewrite /last0 -nth_last.
(* ----------------------------------[ coqtop ]---------------------------------
2 subgoals (ID 474)
Task : TaskType
H : TaskCost Task
Job : JobType
H0 : JobTask Job Task
H1 : JobArrival Job
H2 : JobCost Job
arr_seq : arrival_sequence Job
H_arrival_times_are_consistent : consistent_arrival_times arr_seq
H_arr_seq_is_a_set : arrival_sequence_uniq arr_seq
ts : seq Task
H_all_jobs_from_taskset : all_jobs_from_taskset arr_seq ts
H_valid_job_cost : arrivals_have_valid_job_costs arr_seq
H3 : JobPreemptionPoints Job
H4 : TaskPreemptionPoints Task
H_valid_model_with_fixed_preemption_points : valid_fixed_preemption_points_model
arr_seq ts
H5 : MaxArrivals Task
H_valid_arrival_curve : valid_taskset_arrival_curve ts max_arrivals
H_is_arrival_curve : taskset_respects_max_arrivals arr_seq ts
tsk : Task
H_tsk_in_ts : tsk \in ts
sched : schedule (processor_state Job)
H_jobs_come_from_arrival_sequence : jobs_come_from_arrival_sequence sched
arr_seq
H_schedule_respects_preemption_model : schedule_respects_preemption_model
arr_seq sched
H_jobs_must_arrive_to_execute : jobs_must_arrive_to_execute sched
H_completed_jobs_dont_execute : completed_jobs_dont_execute sched
H6 : FP_policy Task
H_priority_is_reflexive : reflexive_priorities
H_priority_is_transitive : transitive_priorities
H_sequential_tasks : sequential_tasks arr_seq sched
H_work_conserving : work_conserving arr_seq sched
H_respects_policy : respects_policy_at_preemption_point arr_seq sched
rbf := task_request_bound_function : Task -> duration -> nat
task_rbf := rbf tsk : duration -> nat
total_hep_rbf := total_hep_request_bound_function_FP ts tsk
: duration -> nat
total_ohep_rbf := total_ohep_request_bound_function_FP ts tsk
: duration -> nat
blocking_bound := \max_(tsk_other <- ts | ~~ hep_task tsk_other tsk)
(task_max_nonpreemptive_segment tsk_other - ε) : nat
L : duration
H_L_positive : 0 < L
H_fixed_point : L = blocking_bound + total_hep_rbf L
is_in_search_space := bounded_pi.is_in_search_space tsk L : nat -> bool
R : nat
H_R_is_maximum : forall A : duration,
is_in_search_space A ->
exists F : duration,
A + F =
blocking_bound +
(task_rbf (A + ε) - (task_last_nonpr_segment tsk - ε)) +
total_ohep_rbf (A + F) /\
F + (task_last_nonpr_segment tsk - ε) <= R
response_time_bounded_by := task_response_time_bound arr_seq sched
: Task -> duration -> Prop
MLP : valid_limited_preemptions_job_model arr_seq
BEG : task_beginning_of_execution_in_preemption_points ts
END : task_end_of_execution_in_preemption_points ts
INCR : nondecreasing_task_preemption_points ts
HYP1 : consistent_job_segment_count arr_seq
HYP2 : job_respects_segment_lengths arr_seq
HYP3 : task_segments_are_nonempty ts
BEGj : beginning_of_execution_in_preemption_points arr_seq
ENDj : end_of_execution_in_preemption_points arr_seq
POSt : 0 < task_cost tsk
A : duration
SP : bounded_pi.is_in_search_space tsk L A
FF : duration
EQ1 : A + FF =
blocking_bound +
(task_rbf (A + ε) - (task_last_nonpr_segment tsk - ε)) +
total_ohep_rbf (A + FF)
EQ2 : FF + (task_last_nonpr_segment tsk - ε) <= R
============================
0 <
nth 0 (distances (task_preemption_points tsk))
(size (distances (task_preemption_points tsk))).-1
subgoal 2 (ID 467) is:
last0 (distances (task_preemption_points tsk)) <= (task_cost tsk).+1
----------------------------------------------------------------------------- *)
apply HYP3; try by done.
(* ----------------------------------[ coqtop ]---------------------------------
2 subgoals (ID 476)
Task : TaskType
H : TaskCost Task
Job : JobType
H0 : JobTask Job Task
H1 : JobArrival Job
H2 : JobCost Job
arr_seq : arrival_sequence Job
H_arrival_times_are_consistent : consistent_arrival_times arr_seq
H_arr_seq_is_a_set : arrival_sequence_uniq arr_seq
ts : seq Task
H_all_jobs_from_taskset : all_jobs_from_taskset arr_seq ts
H_valid_job_cost : arrivals_have_valid_job_costs arr_seq
H3 : JobPreemptionPoints Job
H4 : TaskPreemptionPoints Task
H_valid_model_with_fixed_preemption_points : valid_fixed_preemption_points_model
arr_seq ts
H5 : MaxArrivals Task
H_valid_arrival_curve : valid_taskset_arrival_curve ts max_arrivals
H_is_arrival_curve : taskset_respects_max_arrivals arr_seq ts
tsk : Task
H_tsk_in_ts : tsk \in ts
sched : schedule (processor_state Job)
H_jobs_come_from_arrival_sequence : jobs_come_from_arrival_sequence sched
arr_seq
H_schedule_respects_preemption_model : schedule_respects_preemption_model
arr_seq sched
H_jobs_must_arrive_to_execute : jobs_must_arrive_to_execute sched
H_completed_jobs_dont_execute : completed_jobs_dont_execute sched
H6 : FP_policy Task
H_priority_is_reflexive : reflexive_priorities
H_priority_is_transitive : transitive_priorities
H_sequential_tasks : sequential_tasks arr_seq sched
H_work_conserving : work_conserving arr_seq sched
H_respects_policy : respects_policy_at_preemption_point arr_seq sched
rbf := task_request_bound_function : Task -> duration -> nat
task_rbf := rbf tsk : duration -> nat
total_hep_rbf := total_hep_request_bound_function_FP ts tsk
: duration -> nat
total_ohep_rbf := total_ohep_request_bound_function_FP ts tsk
: duration -> nat
blocking_bound := \max_(tsk_other <- ts | ~~ hep_task tsk_other tsk)
(task_max_nonpreemptive_segment tsk_other - ε) : nat
L : duration
H_L_positive : 0 < L
H_fixed_point : L = blocking_bound + total_hep_rbf L
is_in_search_space := bounded_pi.is_in_search_space tsk L : nat -> bool
R : nat
H_R_is_maximum : forall A : duration,
is_in_search_space A ->
exists F : duration,
A + F =
blocking_bound +
(task_rbf (A + ε) - (task_last_nonpr_segment tsk - ε)) +
total_ohep_rbf (A + F) /\
F + (task_last_nonpr_segment tsk - ε) <= R
response_time_bounded_by := task_response_time_bound arr_seq sched
: Task -> duration -> Prop
MLP : valid_limited_preemptions_job_model arr_seq
BEG : task_beginning_of_execution_in_preemption_points ts
END : task_end_of_execution_in_preemption_points ts
INCR : nondecreasing_task_preemption_points ts
HYP1 : consistent_job_segment_count arr_seq
HYP2 : job_respects_segment_lengths arr_seq
HYP3 : task_segments_are_nonempty ts
BEGj : beginning_of_execution_in_preemption_points arr_seq
ENDj : end_of_execution_in_preemption_points arr_seq
POSt : 0 < task_cost tsk
A : duration
SP : bounded_pi.is_in_search_space tsk L A
FF : duration
EQ1 : A + FF =
blocking_bound +
(task_rbf (A + ε) - (task_last_nonpr_segment tsk - ε)) +
total_ohep_rbf (A + FF)
EQ2 : FF + (task_last_nonpr_segment tsk - ε) <= R
============================
(size (distances (task_preemption_points tsk))).-1 <
size (distances (task_preemption_points tsk))
subgoal 2 (ID 467) is:
last0 (distances (task_preemption_points tsk)) <= (task_cost tsk).+1
----------------------------------------------------------------------------- *)
rewrite -(ltn_add2r 1) !addn1 prednK //.
(* ----------------------------------[ coqtop ]---------------------------------
2 subgoals (ID 513)
Task : TaskType
H : TaskCost Task
Job : JobType
H0 : JobTask Job Task
H1 : JobArrival Job
H2 : JobCost Job
arr_seq : arrival_sequence Job
H_arrival_times_are_consistent : consistent_arrival_times arr_seq
H_arr_seq_is_a_set : arrival_sequence_uniq arr_seq
ts : seq Task
H_all_jobs_from_taskset : all_jobs_from_taskset arr_seq ts
H_valid_job_cost : arrivals_have_valid_job_costs arr_seq
H3 : JobPreemptionPoints Job
H4 : TaskPreemptionPoints Task
H_valid_model_with_fixed_preemption_points : valid_fixed_preemption_points_model
arr_seq ts
H5 : MaxArrivals Task
H_valid_arrival_curve : valid_taskset_arrival_curve ts max_arrivals
H_is_arrival_curve : taskset_respects_max_arrivals arr_seq ts
tsk : Task
H_tsk_in_ts : tsk \in ts
sched : schedule (processor_state Job)
H_jobs_come_from_arrival_sequence : jobs_come_from_arrival_sequence sched
arr_seq
H_schedule_respects_preemption_model : schedule_respects_preemption_model
arr_seq sched
H_jobs_must_arrive_to_execute : jobs_must_arrive_to_execute sched
H_completed_jobs_dont_execute : completed_jobs_dont_execute sched
H6 : FP_policy Task
H_priority_is_reflexive : reflexive_priorities
H_priority_is_transitive : transitive_priorities
H_sequential_tasks : sequential_tasks arr_seq sched
H_work_conserving : work_conserving arr_seq sched
H_respects_policy : respects_policy_at_preemption_point arr_seq sched
rbf := task_request_bound_function : Task -> duration -> nat
task_rbf := rbf tsk : duration -> nat
total_hep_rbf := total_hep_request_bound_function_FP ts tsk
: duration -> nat
total_ohep_rbf := total_ohep_request_bound_function_FP ts tsk
: duration -> nat
blocking_bound := \max_(tsk_other <- ts | ~~ hep_task tsk_other tsk)
(task_max_nonpreemptive_segment tsk_other - ε) : nat
L : duration
H_L_positive : 0 < L
H_fixed_point : L = blocking_bound + total_hep_rbf L
is_in_search_space := bounded_pi.is_in_search_space tsk L : nat -> bool
R : nat
H_R_is_maximum : forall A : duration,
is_in_search_space A ->
exists F : duration,
A + F =
blocking_bound +
(task_rbf (A + ε) - (task_last_nonpr_segment tsk - ε)) +
total_ohep_rbf (A + F) /\
F + (task_last_nonpr_segment tsk - ε) <= R
response_time_bounded_by := task_response_time_bound arr_seq sched
: Task -> duration -> Prop
MLP : valid_limited_preemptions_job_model arr_seq
BEG : task_beginning_of_execution_in_preemption_points ts
END : task_end_of_execution_in_preemption_points ts
INCR : nondecreasing_task_preemption_points ts
HYP1 : consistent_job_segment_count arr_seq
HYP2 : job_respects_segment_lengths arr_seq
HYP3 : task_segments_are_nonempty ts
BEGj : beginning_of_execution_in_preemption_points arr_seq
ENDj : end_of_execution_in_preemption_points arr_seq
POSt : 0 < task_cost tsk
A : duration
SP : bounded_pi.is_in_search_space tsk L A
FF : duration
EQ1 : A + FF =
blocking_bound +
(task_rbf (A + ε) - (task_last_nonpr_segment tsk - ε)) +
total_ohep_rbf (A + FF)
EQ2 : FF + (task_last_nonpr_segment tsk - ε) <= R
============================
0 < size (distances (task_preemption_points tsk))
subgoal 2 (ID 467) is:
last0 (distances (task_preemption_points tsk)) <= (task_cost tsk).+1
----------------------------------------------------------------------------- *)
move: (number_of_preemption_points_in_task_at_least_two
_ _ H_valid_model_with_fixed_preemption_points _ H_tsk_in_ts POSt) ⇒ Fact2.
(* ----------------------------------[ coqtop ]---------------------------------
2 subgoals (ID 549)
Task : TaskType
H : TaskCost Task
Job : JobType
H0 : JobTask Job Task
H1 : JobArrival Job
H2 : JobCost Job
arr_seq : arrival_sequence Job
H_arrival_times_are_consistent : consistent_arrival_times arr_seq
H_arr_seq_is_a_set : arrival_sequence_uniq arr_seq
ts : seq Task
H_all_jobs_from_taskset : all_jobs_from_taskset arr_seq ts
H_valid_job_cost : arrivals_have_valid_job_costs arr_seq
H3 : JobPreemptionPoints Job
H4 : TaskPreemptionPoints Task
H_valid_model_with_fixed_preemption_points : valid_fixed_preemption_points_model
arr_seq ts
H5 : MaxArrivals Task
H_valid_arrival_curve : valid_taskset_arrival_curve ts max_arrivals
H_is_arrival_curve : taskset_respects_max_arrivals arr_seq ts
tsk : Task
H_tsk_in_ts : tsk \in ts
sched : schedule (processor_state Job)
H_jobs_come_from_arrival_sequence : jobs_come_from_arrival_sequence sched
arr_seq
H_schedule_respects_preemption_model : schedule_respects_preemption_model
arr_seq sched
H_jobs_must_arrive_to_execute : jobs_must_arrive_to_execute sched
H_completed_jobs_dont_execute : completed_jobs_dont_execute sched
H6 : FP_policy Task
H_priority_is_reflexive : reflexive_priorities
H_priority_is_transitive : transitive_priorities
H_sequential_tasks : sequential_tasks arr_seq sched
H_work_conserving : work_conserving arr_seq sched
H_respects_policy : respects_policy_at_preemption_point arr_seq sched
rbf := task_request_bound_function : Task -> duration -> nat
task_rbf := rbf tsk : duration -> nat
total_hep_rbf := total_hep_request_bound_function_FP ts tsk
: duration -> nat
total_ohep_rbf := total_ohep_request_bound_function_FP ts tsk
: duration -> nat
blocking_bound := \max_(tsk_other <- ts | ~~ hep_task tsk_other tsk)
(task_max_nonpreemptive_segment tsk_other - ε) : nat
L : duration
H_L_positive : 0 < L
H_fixed_point : L = blocking_bound + total_hep_rbf L
is_in_search_space := bounded_pi.is_in_search_space tsk L : nat -> bool
R : nat
H_R_is_maximum : forall A : duration,
is_in_search_space A ->
exists F : duration,
A + F =
blocking_bound +
(task_rbf (A + ε) - (task_last_nonpr_segment tsk - ε)) +
total_ohep_rbf (A + F) /\
F + (task_last_nonpr_segment tsk - ε) <= R
response_time_bounded_by := task_response_time_bound arr_seq sched
: Task -> duration -> Prop
MLP : valid_limited_preemptions_job_model arr_seq
BEG : task_beginning_of_execution_in_preemption_points ts
END : task_end_of_execution_in_preemption_points ts
INCR : nondecreasing_task_preemption_points ts
HYP1 : consistent_job_segment_count arr_seq
HYP2 : job_respects_segment_lengths arr_seq
HYP3 : task_segments_are_nonempty ts
BEGj : beginning_of_execution_in_preemption_points arr_seq
ENDj : end_of_execution_in_preemption_points arr_seq
POSt : 0 < task_cost tsk
A : duration
SP : bounded_pi.is_in_search_space tsk L A
FF : duration
EQ1 : A + FF =
blocking_bound +
(task_rbf (A + ε) - (task_last_nonpr_segment tsk - ε)) +
total_ohep_rbf (A + FF)
EQ2 : FF + (task_last_nonpr_segment tsk - ε) <= R
Fact2 : 1 < size (task_preemption_points tsk)
============================
0 < size (distances (task_preemption_points tsk))
subgoal 2 (ID 467) is:
last0 (distances (task_preemption_points tsk)) <= (task_cost tsk).+1
----------------------------------------------------------------------------- *)
move: (Fact2) ⇒ Fact3.
(* ----------------------------------[ coqtop ]---------------------------------
2 subgoals (ID 551)
Task : TaskType
H : TaskCost Task
Job : JobType
H0 : JobTask Job Task
H1 : JobArrival Job
H2 : JobCost Job
arr_seq : arrival_sequence Job
H_arrival_times_are_consistent : consistent_arrival_times arr_seq
H_arr_seq_is_a_set : arrival_sequence_uniq arr_seq
ts : seq Task
H_all_jobs_from_taskset : all_jobs_from_taskset arr_seq ts
H_valid_job_cost : arrivals_have_valid_job_costs arr_seq
H3 : JobPreemptionPoints Job
H4 : TaskPreemptionPoints Task
H_valid_model_with_fixed_preemption_points : valid_fixed_preemption_points_model
arr_seq ts
H5 : MaxArrivals Task
H_valid_arrival_curve : valid_taskset_arrival_curve ts max_arrivals
H_is_arrival_curve : taskset_respects_max_arrivals arr_seq ts
tsk : Task
H_tsk_in_ts : tsk \in ts
sched : schedule (processor_state Job)
H_jobs_come_from_arrival_sequence : jobs_come_from_arrival_sequence sched
arr_seq
H_schedule_respects_preemption_model : schedule_respects_preemption_model
arr_seq sched
H_jobs_must_arrive_to_execute : jobs_must_arrive_to_execute sched
H_completed_jobs_dont_execute : completed_jobs_dont_execute sched
H6 : FP_policy Task
H_priority_is_reflexive : reflexive_priorities
H_priority_is_transitive : transitive_priorities
H_sequential_tasks : sequential_tasks arr_seq sched
H_work_conserving : work_conserving arr_seq sched
H_respects_policy : respects_policy_at_preemption_point arr_seq sched
rbf := task_request_bound_function : Task -> duration -> nat
task_rbf := rbf tsk : duration -> nat
total_hep_rbf := total_hep_request_bound_function_FP ts tsk
: duration -> nat
total_ohep_rbf := total_ohep_request_bound_function_FP ts tsk
: duration -> nat
blocking_bound := \max_(tsk_other <- ts | ~~ hep_task tsk_other tsk)
(task_max_nonpreemptive_segment tsk_other - ε) : nat
L : duration
H_L_positive : 0 < L
H_fixed_point : L = blocking_bound + total_hep_rbf L
is_in_search_space := bounded_pi.is_in_search_space tsk L : nat -> bool
R : nat
H_R_is_maximum : forall A : duration,
is_in_search_space A ->
exists F : duration,
A + F =
blocking_bound +
(task_rbf (A + ε) - (task_last_nonpr_segment tsk - ε)) +
total_ohep_rbf (A + F) /\
F + (task_last_nonpr_segment tsk - ε) <= R
response_time_bounded_by := task_response_time_bound arr_seq sched
: Task -> duration -> Prop
MLP : valid_limited_preemptions_job_model arr_seq
BEG : task_beginning_of_execution_in_preemption_points ts
END : task_end_of_execution_in_preemption_points ts
INCR : nondecreasing_task_preemption_points ts
HYP1 : consistent_job_segment_count arr_seq
HYP2 : job_respects_segment_lengths arr_seq
HYP3 : task_segments_are_nonempty ts
BEGj : beginning_of_execution_in_preemption_points arr_seq
ENDj : end_of_execution_in_preemption_points arr_seq
POSt : 0 < task_cost tsk
A : duration
SP : bounded_pi.is_in_search_space tsk L A
FF : duration
EQ1 : A + FF =
blocking_bound +
(task_rbf (A + ε) - (task_last_nonpr_segment tsk - ε)) +
total_ohep_rbf (A + FF)
EQ2 : FF + (task_last_nonpr_segment tsk - ε) <= R
Fact2, Fact3 : 1 < size (task_preemption_points tsk)
============================
0 < size (distances (task_preemption_points tsk))
subgoal 2 (ID 467) is:
last0 (distances (task_preemption_points tsk)) <= (task_cost tsk).+1
----------------------------------------------------------------------------- *)
by rewrite size_of_seq_of_distances // addn1 ltnS // in Fact2.
(* ----------------------------------[ coqtop ]---------------------------------
1 subgoal (ID 467)
Task : TaskType
H : TaskCost Task
Job : JobType
H0 : JobTask Job Task
H1 : JobArrival Job
H2 : JobCost Job
arr_seq : arrival_sequence Job
H_arrival_times_are_consistent : consistent_arrival_times arr_seq
H_arr_seq_is_a_set : arrival_sequence_uniq arr_seq
ts : seq Task
H_all_jobs_from_taskset : all_jobs_from_taskset arr_seq ts
H_valid_job_cost : arrivals_have_valid_job_costs arr_seq
H3 : JobPreemptionPoints Job
H4 : TaskPreemptionPoints Task
H_valid_model_with_fixed_preemption_points : valid_fixed_preemption_points_model
arr_seq ts
H5 : MaxArrivals Task
H_valid_arrival_curve : valid_taskset_arrival_curve ts max_arrivals
H_is_arrival_curve : taskset_respects_max_arrivals arr_seq ts
tsk : Task
H_tsk_in_ts : tsk \in ts
sched : schedule (processor_state Job)
H_jobs_come_from_arrival_sequence : jobs_come_from_arrival_sequence sched
arr_seq
H_schedule_respects_preemption_model : schedule_respects_preemption_model
arr_seq sched
H_jobs_must_arrive_to_execute : jobs_must_arrive_to_execute sched
H_completed_jobs_dont_execute : completed_jobs_dont_execute sched
H6 : FP_policy Task
H_priority_is_reflexive : reflexive_priorities
H_priority_is_transitive : transitive_priorities
H_sequential_tasks : sequential_tasks arr_seq sched
H_work_conserving : work_conserving arr_seq sched
H_respects_policy : respects_policy_at_preemption_point arr_seq sched
rbf := task_request_bound_function : Task -> duration -> nat
task_rbf := rbf tsk : duration -> nat
total_hep_rbf := total_hep_request_bound_function_FP ts tsk
: duration -> nat
total_ohep_rbf := total_ohep_request_bound_function_FP ts tsk
: duration -> nat
blocking_bound := \max_(tsk_other <- ts | ~~ hep_task tsk_other tsk)
(task_max_nonpreemptive_segment tsk_other - ε) : nat
L : duration
H_L_positive : 0 < L
H_fixed_point : L = blocking_bound + total_hep_rbf L
is_in_search_space := bounded_pi.is_in_search_space tsk L : nat -> bool
R : nat
H_R_is_maximum : forall A : duration,
is_in_search_space A ->
exists F : duration,
A + F =
blocking_bound +
(task_rbf (A + ε) - (task_last_nonpr_segment tsk - ε)) +
total_ohep_rbf (A + F) /\
F + (task_last_nonpr_segment tsk - ε) <= R
response_time_bounded_by := task_response_time_bound arr_seq sched
: Task -> duration -> Prop
MLP : valid_limited_preemptions_job_model arr_seq
BEG : task_beginning_of_execution_in_preemption_points ts
END : task_end_of_execution_in_preemption_points ts
INCR : nondecreasing_task_preemption_points ts
HYP1 : consistent_job_segment_count arr_seq
HYP2 : job_respects_segment_lengths arr_seq
HYP3 : task_segments_are_nonempty ts
BEGj : beginning_of_execution_in_preemption_points arr_seq
ENDj : end_of_execution_in_preemption_points arr_seq
POSt : 0 < task_cost tsk
A : duration
SP : bounded_pi.is_in_search_space tsk L A
FF : duration
EQ1 : A + FF =
blocking_bound +
(task_rbf (A + ε) - (task_last_nonpr_segment tsk - ε)) +
total_ohep_rbf (A + FF)
EQ2 : FF + (task_last_nonpr_segment tsk - ε) <= R
============================
last0 (distances (task_preemption_points tsk)) <= (task_cost tsk).+1
----------------------------------------------------------------------------- *)
- apply leq_trans with (task_max_nonpreemptive_segment tsk).
(* ----------------------------------[ coqtop ]---------------------------------
2 subgoals (ID 595)
Task : TaskType
H : TaskCost Task
Job : JobType
H0 : JobTask Job Task
H1 : JobArrival Job
H2 : JobCost Job
arr_seq : arrival_sequence Job
H_arrival_times_are_consistent : consistent_arrival_times arr_seq
H_arr_seq_is_a_set : arrival_sequence_uniq arr_seq
ts : seq Task
H_all_jobs_from_taskset : all_jobs_from_taskset arr_seq ts
H_valid_job_cost : arrivals_have_valid_job_costs arr_seq
H3 : JobPreemptionPoints Job
H4 : TaskPreemptionPoints Task
H_valid_model_with_fixed_preemption_points : valid_fixed_preemption_points_model
arr_seq ts
H5 : MaxArrivals Task
H_valid_arrival_curve : valid_taskset_arrival_curve ts max_arrivals
H_is_arrival_curve : taskset_respects_max_arrivals arr_seq ts
tsk : Task
H_tsk_in_ts : tsk \in ts
sched : schedule (processor_state Job)
H_jobs_come_from_arrival_sequence : jobs_come_from_arrival_sequence sched
arr_seq
H_schedule_respects_preemption_model : schedule_respects_preemption_model
arr_seq sched
H_jobs_must_arrive_to_execute : jobs_must_arrive_to_execute sched
H_completed_jobs_dont_execute : completed_jobs_dont_execute sched
H6 : FP_policy Task
H_priority_is_reflexive : reflexive_priorities
H_priority_is_transitive : transitive_priorities
H_sequential_tasks : sequential_tasks arr_seq sched
H_work_conserving : work_conserving arr_seq sched
H_respects_policy : respects_policy_at_preemption_point arr_seq sched
rbf := task_request_bound_function : Task -> duration -> nat
task_rbf := rbf tsk : duration -> nat
total_hep_rbf := total_hep_request_bound_function_FP ts tsk
: duration -> nat
total_ohep_rbf := total_ohep_request_bound_function_FP ts tsk
: duration -> nat
blocking_bound := \max_(tsk_other <- ts | ~~ hep_task tsk_other tsk)
(task_max_nonpreemptive_segment tsk_other - ε) : nat
L : duration
H_L_positive : 0 < L
H_fixed_point : L = blocking_bound + total_hep_rbf L
is_in_search_space := bounded_pi.is_in_search_space tsk L : nat -> bool
R : nat
H_R_is_maximum : forall A : duration,
is_in_search_space A ->
exists F : duration,
A + F =
blocking_bound +
(task_rbf (A + ε) - (task_last_nonpr_segment tsk - ε)) +
total_ohep_rbf (A + F) /\
F + (task_last_nonpr_segment tsk - ε) <= R
response_time_bounded_by := task_response_time_bound arr_seq sched
: Task -> duration -> Prop
MLP : valid_limited_preemptions_job_model arr_seq
BEG : task_beginning_of_execution_in_preemption_points ts
END : task_end_of_execution_in_preemption_points ts
INCR : nondecreasing_task_preemption_points ts
HYP1 : consistent_job_segment_count arr_seq
HYP2 : job_respects_segment_lengths arr_seq
HYP3 : task_segments_are_nonempty ts
BEGj : beginning_of_execution_in_preemption_points arr_seq
ENDj : end_of_execution_in_preemption_points arr_seq
POSt : 0 < task_cost tsk
A : duration
SP : bounded_pi.is_in_search_space tsk L A
FF : duration
EQ1 : A + FF =
blocking_bound +
(task_rbf (A + ε) - (task_last_nonpr_segment tsk - ε)) +
total_ohep_rbf (A + FF)
EQ2 : FF + (task_last_nonpr_segment tsk - ε) <= R
============================
last0 (distances (task_preemption_points tsk)) <=
task_max_nonpreemptive_segment tsk
subgoal 2 (ID 596) is:
task_max_nonpreemptive_segment tsk <= (task_cost tsk).+1
----------------------------------------------------------------------------- *)
+ by apply last_of_seq_le_max_of_seq.
(* ----------------------------------[ coqtop ]---------------------------------
1 subgoal (ID 596)
Task : TaskType
H : TaskCost Task
Job : JobType
H0 : JobTask Job Task
H1 : JobArrival Job
H2 : JobCost Job
arr_seq : arrival_sequence Job
H_arrival_times_are_consistent : consistent_arrival_times arr_seq
H_arr_seq_is_a_set : arrival_sequence_uniq arr_seq
ts : seq Task
H_all_jobs_from_taskset : all_jobs_from_taskset arr_seq ts
H_valid_job_cost : arrivals_have_valid_job_costs arr_seq
H3 : JobPreemptionPoints Job
H4 : TaskPreemptionPoints Task
H_valid_model_with_fixed_preemption_points : valid_fixed_preemption_points_model
arr_seq ts
H5 : MaxArrivals Task
H_valid_arrival_curve : valid_taskset_arrival_curve ts max_arrivals
H_is_arrival_curve : taskset_respects_max_arrivals arr_seq ts
tsk : Task
H_tsk_in_ts : tsk \in ts
sched : schedule (processor_state Job)
H_jobs_come_from_arrival_sequence : jobs_come_from_arrival_sequence sched
arr_seq
H_schedule_respects_preemption_model : schedule_respects_preemption_model
arr_seq sched
H_jobs_must_arrive_to_execute : jobs_must_arrive_to_execute sched
H_completed_jobs_dont_execute : completed_jobs_dont_execute sched
H6 : FP_policy Task
H_priority_is_reflexive : reflexive_priorities
H_priority_is_transitive : transitive_priorities
H_sequential_tasks : sequential_tasks arr_seq sched
H_work_conserving : work_conserving arr_seq sched
H_respects_policy : respects_policy_at_preemption_point arr_seq sched
rbf := task_request_bound_function : Task -> duration -> nat
task_rbf := rbf tsk : duration -> nat
total_hep_rbf := total_hep_request_bound_function_FP ts tsk
: duration -> nat
total_ohep_rbf := total_ohep_request_bound_function_FP ts tsk
: duration -> nat
blocking_bound := \max_(tsk_other <- ts | ~~ hep_task tsk_other tsk)
(task_max_nonpreemptive_segment tsk_other - ε) : nat
L : duration
H_L_positive : 0 < L
H_fixed_point : L = blocking_bound + total_hep_rbf L
is_in_search_space := bounded_pi.is_in_search_space tsk L : nat -> bool
R : nat
H_R_is_maximum : forall A : duration,
is_in_search_space A ->
exists F : duration,
A + F =
blocking_bound +
(task_rbf (A + ε) - (task_last_nonpr_segment tsk - ε)) +
total_ohep_rbf (A + F) /\
F + (task_last_nonpr_segment tsk - ε) <= R
response_time_bounded_by := task_response_time_bound arr_seq sched
: Task -> duration -> Prop
MLP : valid_limited_preemptions_job_model arr_seq
BEG : task_beginning_of_execution_in_preemption_points ts
END : task_end_of_execution_in_preemption_points ts
INCR : nondecreasing_task_preemption_points ts
HYP1 : consistent_job_segment_count arr_seq
HYP2 : job_respects_segment_lengths arr_seq
HYP3 : task_segments_are_nonempty ts
BEGj : beginning_of_execution_in_preemption_points arr_seq
ENDj : end_of_execution_in_preemption_points arr_seq
POSt : 0 < task_cost tsk
A : duration
SP : bounded_pi.is_in_search_space tsk L A
FF : duration
EQ1 : A + FF =
blocking_bound +
(task_rbf (A + ε) - (task_last_nonpr_segment tsk - ε)) +
total_ohep_rbf (A + FF)
EQ2 : FF + (task_last_nonpr_segment tsk - ε) <= R
============================
task_max_nonpreemptive_segment tsk <= (task_cost tsk).+1
----------------------------------------------------------------------------- *)
+ rewrite -END; last by done.
(* ----------------------------------[ coqtop ]---------------------------------
1 subgoal (ID 602)
Task : TaskType
H : TaskCost Task
Job : JobType
H0 : JobTask Job Task
H1 : JobArrival Job
H2 : JobCost Job
arr_seq : arrival_sequence Job
H_arrival_times_are_consistent : consistent_arrival_times arr_seq
H_arr_seq_is_a_set : arrival_sequence_uniq arr_seq
ts : seq Task
H_all_jobs_from_taskset : all_jobs_from_taskset arr_seq ts
H_valid_job_cost : arrivals_have_valid_job_costs arr_seq
H3 : JobPreemptionPoints Job
H4 : TaskPreemptionPoints Task
H_valid_model_with_fixed_preemption_points : valid_fixed_preemption_points_model
arr_seq ts
H5 : MaxArrivals Task
H_valid_arrival_curve : valid_taskset_arrival_curve ts max_arrivals
H_is_arrival_curve : taskset_respects_max_arrivals arr_seq ts
tsk : Task
H_tsk_in_ts : tsk \in ts
sched : schedule (processor_state Job)
H_jobs_come_from_arrival_sequence : jobs_come_from_arrival_sequence sched
arr_seq
H_schedule_respects_preemption_model : schedule_respects_preemption_model
arr_seq sched
H_jobs_must_arrive_to_execute : jobs_must_arrive_to_execute sched
H_completed_jobs_dont_execute : completed_jobs_dont_execute sched
H6 : FP_policy Task
H_priority_is_reflexive : reflexive_priorities
H_priority_is_transitive : transitive_priorities
H_sequential_tasks : sequential_tasks arr_seq sched
H_work_conserving : work_conserving arr_seq sched
H_respects_policy : respects_policy_at_preemption_point arr_seq sched
rbf := task_request_bound_function : Task -> duration -> nat
task_rbf := rbf tsk : duration -> nat
total_hep_rbf := total_hep_request_bound_function_FP ts tsk
: duration -> nat
total_ohep_rbf := total_ohep_request_bound_function_FP ts tsk
: duration -> nat
blocking_bound := \max_(tsk_other <- ts | ~~ hep_task tsk_other tsk)
(task_max_nonpreemptive_segment tsk_other - ε) : nat
L : duration
H_L_positive : 0 < L
H_fixed_point : L = blocking_bound + total_hep_rbf L
is_in_search_space := bounded_pi.is_in_search_space tsk L : nat -> bool
R : nat
H_R_is_maximum : forall A : duration,
is_in_search_space A ->
exists F : duration,
A + F =
blocking_bound +
(task_rbf (A + ε) - (task_last_nonpr_segment tsk - ε)) +
total_ohep_rbf (A + F) /\
F + (task_last_nonpr_segment tsk - ε) <= R
response_time_bounded_by := task_response_time_bound arr_seq sched
: Task -> duration -> Prop
MLP : valid_limited_preemptions_job_model arr_seq
BEG : task_beginning_of_execution_in_preemption_points ts
END : task_end_of_execution_in_preemption_points ts
INCR : nondecreasing_task_preemption_points ts
HYP1 : consistent_job_segment_count arr_seq
HYP2 : job_respects_segment_lengths arr_seq
HYP3 : task_segments_are_nonempty ts
BEGj : beginning_of_execution_in_preemption_points arr_seq
ENDj : end_of_execution_in_preemption_points arr_seq
POSt : 0 < task_cost tsk
A : duration
SP : bounded_pi.is_in_search_space tsk L A
FF : duration
EQ1 : A + FF =
blocking_bound +
(task_rbf (A + ε) - (task_last_nonpr_segment tsk - ε)) +
total_ohep_rbf (A + FF)
EQ2 : FF + (task_last_nonpr_segment tsk - ε) <= R
============================
task_max_nonpreemptive_segment tsk <=
(last0 (task_preemption_points tsk)).+1
----------------------------------------------------------------------------- *)
apply ltnW; rewrite ltnS; try done.
(* ----------------------------------[ coqtop ]---------------------------------
1 subgoal (ID 608)
Task : TaskType
H : TaskCost Task
Job : JobType
H0 : JobTask Job Task
H1 : JobArrival Job
H2 : JobCost Job
arr_seq : arrival_sequence Job
H_arrival_times_are_consistent : consistent_arrival_times arr_seq
H_arr_seq_is_a_set : arrival_sequence_uniq arr_seq
ts : seq Task
H_all_jobs_from_taskset : all_jobs_from_taskset arr_seq ts
H_valid_job_cost : arrivals_have_valid_job_costs arr_seq
H3 : JobPreemptionPoints Job
H4 : TaskPreemptionPoints Task
H_valid_model_with_fixed_preemption_points : valid_fixed_preemption_points_model
arr_seq ts
H5 : MaxArrivals Task
H_valid_arrival_curve : valid_taskset_arrival_curve ts max_arrivals
H_is_arrival_curve : taskset_respects_max_arrivals arr_seq ts
tsk : Task
H_tsk_in_ts : tsk \in ts
sched : schedule (processor_state Job)
H_jobs_come_from_arrival_sequence : jobs_come_from_arrival_sequence sched
arr_seq
H_schedule_respects_preemption_model : schedule_respects_preemption_model
arr_seq sched
H_jobs_must_arrive_to_execute : jobs_must_arrive_to_execute sched
H_completed_jobs_dont_execute : completed_jobs_dont_execute sched
H6 : FP_policy Task
H_priority_is_reflexive : reflexive_priorities
H_priority_is_transitive : transitive_priorities
H_sequential_tasks : sequential_tasks arr_seq sched
H_work_conserving : work_conserving arr_seq sched
H_respects_policy : respects_policy_at_preemption_point arr_seq sched
rbf := task_request_bound_function : Task -> duration -> nat
task_rbf := rbf tsk : duration -> nat
total_hep_rbf := total_hep_request_bound_function_FP ts tsk
: duration -> nat
total_ohep_rbf := total_ohep_request_bound_function_FP ts tsk
: duration -> nat
blocking_bound := \max_(tsk_other <- ts | ~~ hep_task tsk_other tsk)
(task_max_nonpreemptive_segment tsk_other - ε) : nat
L : duration
H_L_positive : 0 < L
H_fixed_point : L = blocking_bound + total_hep_rbf L
is_in_search_space := bounded_pi.is_in_search_space tsk L : nat -> bool
R : nat
H_R_is_maximum : forall A : duration,
is_in_search_space A ->
exists F : duration,
A + F =
blocking_bound +
(task_rbf (A + ε) - (task_last_nonpr_segment tsk - ε)) +
total_ohep_rbf (A + F) /\
F + (task_last_nonpr_segment tsk - ε) <= R
response_time_bounded_by := task_response_time_bound arr_seq sched
: Task -> duration -> Prop
MLP : valid_limited_preemptions_job_model arr_seq
BEG : task_beginning_of_execution_in_preemption_points ts
END : task_end_of_execution_in_preemption_points ts
INCR : nondecreasing_task_preemption_points ts
HYP1 : consistent_job_segment_count arr_seq
HYP2 : job_respects_segment_lengths arr_seq
HYP3 : task_segments_are_nonempty ts
BEGj : beginning_of_execution_in_preemption_points arr_seq
ENDj : end_of_execution_in_preemption_points arr_seq
POSt : 0 < task_cost tsk
A : duration
SP : bounded_pi.is_in_search_space tsk L A
FF : duration
EQ1 : A + FF =
blocking_bound +
(task_rbf (A + ε) - (task_last_nonpr_segment tsk - ε)) +
total_ohep_rbf (A + FF)
EQ2 : FF + (task_last_nonpr_segment tsk - ε) <= R
============================
task_max_nonpreemptive_segment tsk <= last0 (task_preemption_points tsk)
----------------------------------------------------------------------------- *)
by apply max_distance_in_seq_le_last_element_of_seq; eauto 2.
(* ----------------------------------[ coqtop ]---------------------------------
No more subgoals.
----------------------------------------------------------------------------- *)
Qed.
End RTAforFixedPreemptionPointsModelwithArrivalCurves.