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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/core.c | |
| parent | afaa653c564da38c0b34c4baba31e88c46a8764c (diff) | |
| download | linux-b2a02fc43a1f40ef4eb2fb2b06357382608d4d84.tar.bz2 | |
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/core.c')
| -rw-r--r-- | kernel/sched/core.c | 10 |
1 files changed, 10 insertions, 0 deletions
diff --git a/kernel/sched/core.c b/kernel/sched/core.c index 2cacc1e44a84..fa0d4990618e 100644 --- a/kernel/sched/core.c +++ b/kernel/sched/core.c @@ -2296,6 +2296,16 @@ static void wake_csd_func(void *info) sched_ttwu_pending(); } +void send_call_function_single_ipi(int cpu) +{ + struct rq *rq = cpu_rq(cpu); + + if (!set_nr_if_polling(rq->idle)) + arch_send_call_function_single_ipi(cpu); + else + trace_sched_wake_idle_without_ipi(cpu); +} + /* * Queue a task on the target CPUs wake_list and wake the CPU via IPI if * necessary. The wakee CPU on receipt of the IPI will queue the task |