From b2a02fc43a1f40ef4eb2fb2b06357382608d4d84 Mon Sep 17 00:00:00 2001 From: Peter Zijlstra Date: Tue, 26 May 2020 18:11:01 +0200 Subject: 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) Signed-off-by: Ingo Molnar Link: https://lore.kernel.org/r/20200526161907.953304789@infradead.org --- kernel/sched/core.c | 10 ++++++++++ kernel/sched/idle.c | 5 +++++ kernel/sched/sched.h | 7 ++++--- 3 files changed, 19 insertions(+), 3 deletions(-) (limited to 'kernel/sched') 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 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(); diff --git a/kernel/sched/sched.h b/kernel/sched/sched.h index 3c163cb5493f..75b062999c43 100644 --- a/kernel/sched/sched.h +++ b/kernel/sched/sched.h @@ -1506,11 +1506,12 @@ static inline void unregister_sched_domain_sysctl(void) } #endif -#else +extern void flush_smp_call_function_from_idle(void); +#else /* !CONFIG_SMP: */ +static inline void flush_smp_call_function_from_idle(void) { } static inline void sched_ttwu_pending(void) { } - -#endif /* CONFIG_SMP */ +#endif #include "stats.h" #include "autogroup.h" -- cgit v1.2.3