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| author | Valentin Schneider <vschneid@redhat.com> | 2023-03-07 14:35:53 +0000 |
|---|---|---|
| committer | Peter Zijlstra <peterz@infradead.org> | 2023-03-24 11:01:27 +0100 |
| commit | cc9cb0a71725aa8dd8d8f534a9b562bbf7981f75 (patch) | |
| tree | cfbb5e1471f708af0d9769c1c3e448e52435fcd4 | |
| parent | 56eb0598c7a30c76009a082d3213486d6a013df0 (diff) | |
| download | linux-stable-cc9cb0a71725aa8dd8d8f534a9b562bbf7981f75.tar.gz linux-stable-cc9cb0a71725aa8dd8d8f534a9b562bbf7981f75.tar.bz2 linux-stable-cc9cb0a71725aa8dd8d8f534a9b562bbf7981f75.zip | |
sched, smp: Trace IPIs sent via send_call_function_single_ipi()
send_call_function_single_ipi() is the thing that sends IPIs at the bottom
of smp_call_function*() via either generic_exec_single() or
smp_call_function_many_cond(). Give it an IPI-related tracepoint.
Note that this ends up tracing any IPI sent via __smp_call_single_queue(),
which covers __ttwu_queue_wakelist() and irq_work_queue_on() "for free".
Signed-off-by: Valentin Schneider <vschneid@redhat.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Reviewed-by: Steven Rostedt (Google) <rostedt@goodmis.org>
Acked-by: Ingo Molnar <mingo@kernel.org>
Link: https://lore.kernel.org/r/20230307143558.294354-3-vschneid@redhat.com
| -rw-r--r-- | arch/arm/kernel/smp.c | 1 | ||||
| -rw-r--r-- | arch/arm64/kernel/smp.c | 1 | ||||
| -rw-r--r-- | kernel/sched/core.c | 9 | ||||
| -rw-r--r-- | kernel/smp.c | 2 |
4 files changed, 9 insertions, 4 deletions
diff --git a/arch/arm/kernel/smp.c b/arch/arm/kernel/smp.c index 0b8c25763adc..5edf09237b2f 100644 --- a/arch/arm/kernel/smp.c +++ b/arch/arm/kernel/smp.c @@ -48,7 +48,6 @@ #include <asm/mach/arch.h> #include <asm/mpu.h> -#define CREATE_TRACE_POINTS #include <trace/events/ipi.h> /* diff --git a/arch/arm64/kernel/smp.c b/arch/arm64/kernel/smp.c index 4e8327264255..438c16fc4463 100644 --- a/arch/arm64/kernel/smp.c +++ b/arch/arm64/kernel/smp.c @@ -51,7 +51,6 @@ #include <asm/ptrace.h> #include <asm/virt.h> -#define CREATE_TRACE_POINTS #include <trace/events/ipi.h> DEFINE_PER_CPU_READ_MOSTLY(int, cpu_number); diff --git a/kernel/sched/core.c b/kernel/sched/core.c index 488655f2319f..c26a2cd99ec7 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 +96,8 @@ #include "../../io_uring/io-wq.h" #include "../smpboot.h" +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. @@ -3830,10 +3833,12 @@ void send_call_function_single_ipi(int cpu) { struct rq *rq = cpu_rq(cpu); - if (!set_nr_if_polling(rq->idle)) + if (!set_nr_if_polling(rq->idle)) { + trace_ipi_send_cpumask(cpumask_of(cpu), _RET_IP_, NULL); arch_send_call_function_single_ipi(cpu); - else + } else { trace_sched_wake_idle_without_ipi(cpu); + } } /* diff --git a/kernel/smp.c b/kernel/smp.c index 298ba7570621..770e879a7274 100644 --- a/kernel/smp.c +++ b/kernel/smp.c @@ -26,6 +26,8 @@ #include <linux/sched/debug.h> #include <linux/jump_label.h> +#include <trace/events/ipi.h> + #include "smpboot.h" #include "sched/smp.h" |