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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
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@ -48,7 +48,6 @@
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#include <asm/mach/arch.h>
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#include <asm/mpu.h>
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#define CREATE_TRACE_POINTS
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#include <trace/events/ipi.h>
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/*
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@ -51,7 +51,6 @@
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#include <asm/ptrace.h>
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#include <asm/virt.h>
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#define CREATE_TRACE_POINTS
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#include <trace/events/ipi.h>
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DEFINE_PER_CPU_READ_MOSTLY(int, cpu_number);
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@ -80,6 +80,7 @@
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#define CREATE_TRACE_POINTS
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#include <linux/sched/rseq_api.h>
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#include <trace/events/sched.h>
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#include <trace/events/ipi.h>
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#undef CREATE_TRACE_POINTS
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#include "sched.h"
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@ -95,6 +96,8 @@
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#include "../../io_uring/io-wq.h"
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#include "../smpboot.h"
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EXPORT_TRACEPOINT_SYMBOL_GPL(ipi_send_cpumask);
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/*
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* Export tracepoints that act as a bare tracehook (ie: have no trace event
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* associated with them) to allow external modules to probe them.
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@ -3830,10 +3833,12 @@ void send_call_function_single_ipi(int cpu)
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{
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struct rq *rq = cpu_rq(cpu);
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if (!set_nr_if_polling(rq->idle))
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if (!set_nr_if_polling(rq->idle)) {
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trace_ipi_send_cpumask(cpumask_of(cpu), _RET_IP_, NULL);
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arch_send_call_function_single_ipi(cpu);
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else
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} else {
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trace_sched_wake_idle_without_ipi(cpu);
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}
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}
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/*
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@ -26,6 +26,8 @@
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#include <linux/sched/debug.h>
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#include <linux/jump_label.h>
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#include <trace/events/ipi.h>
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#include "smpboot.h"
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#include "sched/smp.h"
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