diff options
Diffstat (limited to 'kernel/sched')
| -rw-r--r-- | kernel/sched/core.c | 22 | ||||
| -rw-r--r-- | kernel/sched/smp.h | 2 |
2 files changed, 17 insertions, 7 deletions
diff --git a/kernel/sched/core.c b/kernel/sched/core.c index 54c75af24899..944c3ae39861 100644 --- a/kernel/sched/core.c +++ b/kernel/sched/core.c @@ -80,6 +80,7 @@ #define CREATE_TRACE_POINTS #include <linux/sched/rseq_api.h> #include <trace/events/sched.h> +#include <trace/events/ipi.h> #undef CREATE_TRACE_POINTS #include "sched.h" @@ -95,6 +96,9 @@ #include "../../io_uring/io-wq.h" #include "../smpboot.h" +EXPORT_TRACEPOINT_SYMBOL_GPL(ipi_send_cpu); +EXPORT_TRACEPOINT_SYMBOL_GPL(ipi_send_cpumask); + /* * Export tracepoints that act as a bare tracehook (ie: have no trace event * associated with them) to allow external modules to probe them. @@ -3848,14 +3852,20 @@ void sched_ttwu_pending(void *arg) rq_unlock_irqrestore(rq, &rf); } -void send_call_function_single_ipi(int cpu) +/* + * Prepare the scene for sending an IPI for a remote smp_call + * + * Returns true if the caller can proceed with sending the IPI. + * Returns false otherwise. + */ +bool call_function_single_prep_ipi(int cpu) { - struct rq *rq = cpu_rq(cpu); - - if (!set_nr_if_polling(rq->idle)) - arch_send_call_function_single_ipi(cpu); - else + if (set_nr_if_polling(cpu_rq(cpu)->idle)) { trace_sched_wake_idle_without_ipi(cpu); + return false; + } + + return true; } /* diff --git a/kernel/sched/smp.h b/kernel/sched/smp.h index 2eb23dd0f285..21ac44428bb0 100644 --- a/kernel/sched/smp.h +++ b/kernel/sched/smp.h @@ -6,7 +6,7 @@ extern void sched_ttwu_pending(void *arg); -extern void send_call_function_single_ipi(int cpu); +extern bool call_function_single_prep_ipi(int cpu); #ifdef CONFIG_SMP extern void flush_smp_call_function_queue(void); |