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tick/nohz: Call tick_nohz_task_switch() with interrupts disabled 

Call tick_nohz_task_switch() slightly earlier after the context switch
to benefit from disabled IRQs. This way the function doesn't need to
disable them once more.

Signed-off-by: Peter Zijlstra <peterz@infradead.org>
Signed-off-by: Frederic Weisbecker <frederic@kernel.org>
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Link: https://lore.kernel.org/r/20210512232924.150322-10-frederic@kernel.org
This commit is contained in:
Peter Zijlstra 2021-05-13 01:29:23 +02:00 committed by Ingo Molnar
parent a1dfb6311c
commit 0fdcccfafc
2 changed files with 2 additions and 7 deletions
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2
kernel/sched/core.c
View File

@ -4212,6 +4212,7 @@ static struct rq *finish_task_switch(struct task_struct *prev)
vtime_task_switch(prev); vtime_task_switch(prev);
perf_event_task_sched_in(prev, current); perf_event_task_sched_in(prev, current);
finish_task(prev); finish_task(prev);
tick_nohz_task_switch();
finish_lock_switch(rq); finish_lock_switch(rq);
finish_arch_post_lock_switch(); finish_arch_post_lock_switch();
kcov_finish_switch(current); kcov_finish_switch(current);
@ -4257,7 +4258,6 @@ static struct rq *finish_task_switch(struct task_struct *prev)
put_task_struct_rcu_user(prev); put_task_struct_rcu_user(prev);
} }
tick_nohz_task_switch();
return rq; return rq;
} }

7
kernel/time/tick-sched.c
View File

@ -487,13 +487,10 @@ void tick_nohz_dep_clear_signal(struct signal_struct *sig, enum tick_dep_bits bi
*/ */
void __tick_nohz_task_switch(void) void __tick_nohz_task_switch(void)
{ {
unsigned long flags;
struct tick_sched *ts; struct tick_sched *ts;
local_irq_save(flags);
if (!tick_nohz_full_cpu(smp_processor_id())) if (!tick_nohz_full_cpu(smp_processor_id()))
goto out; return;
ts = this_cpu_ptr(&tick_cpu_sched); ts = this_cpu_ptr(&tick_cpu_sched);
@ -502,8 +499,6 @@ void __tick_nohz_task_switch(void)
atomic_read(&current->signal->tick_dep_mask)) atomic_read(&current->signal->tick_dep_mask))
tick_nohz_full_kick(); tick_nohz_full_kick();
} }
out:
local_irq_restore(flags);
} }
/* Get the boot-time nohz CPU list from the kernel parameters. */ /* Get the boot-time nohz CPU list from the kernel parameters. */