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| author |   Peter Zijlstra <peterz@infradead.org> | 2020-05-26 18:11:01 +0200 |
|---|---|---|
| committer |   Ingo Molnar <mingo@kernel.org> | 2020-05-28 10:54:15 +0200 |
| commit | b2a02fc43a1f40ef4eb2fb2b06357382608d4d84 (patch) | |
| tree | beedd3ab17cd9da7d49948aff6e1d82fe535dc81 /kernel/sched/idle.c | |
| parent | smp: Move irq_work_run() out of flush_smp_call_function_queue() (diff) | |
| download | linux-dev-b2a02fc43a1f40ef4eb2fb2b06357382608d4d84.tar.xz linux-dev-b2a02fc43a1f40ef4eb2fb2b06357382608d4d84.zip | |
smp: Optimize send_call_function_single_ipi()
Just like the ttwu_queue_remote() IPI, make use of _TIF_POLLING_NRFLAG
to avoid sending IPIs to idle CPUs.
[ mingo: Fix UP build bug. ]
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Link: https://lore.kernel.org/r/20200526161907.953304789@infradead.org
Diffstat (limited to 'kernel/sched/idle.c')
| -rw-r--r-- | kernel/sched/idle.c | 5 |
1 files changed, 5 insertions, 0 deletions
diff --git a/kernel/sched/idle.c b/kernel/sched/idle.c index b743bf38f08f..387fd75ee6f7 100644 --- a/kernel/sched/idle.c +++ b/kernel/sched/idle.c @@ -289,6 +289,11 @@ static void do_idle(void) */ smp_mb__after_atomic(); + /* + * RCU relies on this call to be done outside of an RCU read-side + * critical section. + */ + flush_smp_call_function_from_idle(); sched_ttwu_pending(); schedule_idle(); |