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sched/sched: address performance concerns for sched_lock in non-SMP case

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Signed-off-by: Petro Karashchenko <petro.karashchenko@gmail.com>
This commit is contained in:
Petro Karashchenko 2023-04-19 00:09:03 +03:00 committed by Xiang Xiao
parent e3ca288087
commit 7911a25774
2 changed files with 34 additions and 25 deletions
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21
sched/sched/sched_lock.c
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@ -236,17 +236,12 @@ int sched_lock(void)
if (rtcb != NULL && !up_interrupt_context())
{
FAR struct tcb_s *ptcb;
irqstate_t flags;
/* Catch attempts to increment the lockcount beyond the range of the
* integer type.
*/
DEBUGASSERT(rtcb->lockcount < MAX_LOCK_COUNT);
flags = enter_critical_section();
/* A counter is used to support locking. This allows nested lock
* operations on this thread (on any CPU)
*/
@ -269,22 +264,6 @@ int sched_lock(void)
#endif
}
#endif
/* Move any tasks in the ready-to-run list to the pending task list
* where they will not be available to run until the scheduler is
* unlocked and nxsched_merge_pending() is called. So ready-to-run
* will consist only from the currently runnig task and the idle task.
*/
for (ptcb = rtcb->flink; ptcb && ptcb->flink; ptcb = rtcb->flink)
{
dq_rem((FAR dq_entry_t *)ptcb, &g_readytorun);
nxsched_add_prioritized(ptcb, &g_pendingtasks);
ptcb->task_state = TSTATE_TASK_PENDING;
}
leave_critical_section(flags);
}
return OK;

30
sched/sched/sched_setpriority.c
View File

@ -142,6 +142,35 @@ static inline void nxsched_running_setpriority(FAR struct tcb_s *tcb,
{
FAR struct tcb_s *rtcb = this_task();
if (rtcb->lockcount > 0)
{
/* Move all tasks with the higher priority from the ready-to-run
* list to the pending list.
*/
do
{
bool check = nxsched_remove_readytorun(nxttcb, false);
DEBUGASSERT(check == false);
UNUSED(check);
nxsched_add_prioritized(nxttcb, &g_pendingtasks);
nxttcb->task_state = TSTATE_TASK_PENDING;
#ifdef CONFIG_SMP
nxttcb = nxsched_nexttcb(tcb);
#else
nxttcb = tcb->flink;
#endif
}
while (sched_priority < nxttcb->sched_priority);
/* Change the task priority */
tcb->sched_priority = (uint8_t)sched_priority;
}
else
{
/* A context switch will occur. */
if (nxsched_reprioritize_rtr(tcb, sched_priority))
@ -149,6 +178,7 @@ static inline void nxsched_running_setpriority(FAR struct tcb_s *tcb,
up_switch_context(this_task(), rtcb);
}
}
}
/* Otherwise, we can just change priority since it has no effect */