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trace: Add trace_ipi_send_cpu()

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Because copying cpumasks around when targeting a single CPU is a bit
daft...

Tested-and-reviewed-by: Valentin Schneider <vschneid@redhat.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Link: https://lkml.kernel.org/r/20230322103004.GA571242%40hirez.programming.kicks-ass.net
This commit is contained in:
Peter Zijlstra 2023-03-22 11:28:36 +01:00
parent 68f4ff04db
commit 68e2d17c9e
5 changed files with 30 additions and 9 deletions
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6
include/linux/smp.h
View file

@ -130,9 +130,9 @@ extern void arch_smp_send_reschedule(int cpu);
* scheduler_ipi() is inline so can't be passed as callback reason, but the
* callsite IP should be sufficient for root-causing IPIs sent from here.
*/
#define smp_send_reschedule(cpu) ({ \
trace_ipi_send_cpumask(cpumask_of(cpu), _RET_IP_, NULL); \
arch_smp_send_reschedule(cpu); \
#define smp_send_reschedule(cpu) ({ \
trace_ipi_send_cpu(cpu, _RET_IP_, NULL); \
arch_smp_send_reschedule(cpu); \
})
/*

22
include/trace/events/ipi.h
View file

@ -35,6 +35,28 @@ TRACE_EVENT(ipi_raise,
TP_printk("target_mask=%s (%s)", __get_bitmask(target_cpus), __entry->reason)
);
TRACE_EVENT(ipi_send_cpu,
TP_PROTO(const unsigned int cpu, unsigned long callsite, void *callback),
TP_ARGS(cpu, callsite, callback),
TP_STRUCT__entry(
__field(unsigned int, cpu)
__field(void *, callsite)
__field(void *, callback)
),
TP_fast_assign(
__entry->cpu = cpu;
__entry->callsite = (void *)callsite;
__entry->callback = callback;
),
TP_printk("cpu=%u callsite=%pS callback=%pS",
__entry->cpu, __entry->callsite, __entry->callback)
);
TRACE_EVENT(ipi_send_cpumask,
TP_PROTO(const struct cpumask *cpumask, unsigned long callsite, void *callback),

6
kernel/irq_work.c
View file

@ -78,10 +78,8 @@ void __weak arch_irq_work_raise(void)
static __always_inline void irq_work_raise(struct irq_work *work)
{
if (trace_ipi_send_cpumask_enabled() && arch_irq_work_has_interrupt())
trace_ipi_send_cpumask(cpumask_of(smp_processor_id()),
_RET_IP_,
work->func);
if (trace_ipi_send_cpu_enabled() && arch_irq_work_has_interrupt())
trace_ipi_send_cpu(smp_processor_id(), _RET_IP_, work->func);
arch_irq_work_raise();
}

1
kernel/sched/core.c
View file

@ -96,6 +96,7 @@
#include "../../io_uring/io-wq.h"
#include "../smpboot.h"
EXPORT_TRACEPOINT_SYMBOL_GPL(ipi_send_cpu);
EXPORT_TRACEPOINT_SYMBOL_GPL(ipi_send_cpumask);
/*

4
kernel/smp.c
View file

@ -107,7 +107,7 @@ static __always_inline void
send_call_function_single_ipi(int cpu, smp_call_func_t func)
{
if (call_function_single_prep_ipi(cpu)) {
trace_ipi_send_cpumask(cpumask_of(cpu), _RET_IP_, func);
trace_ipi_send_cpu(cpu, _RET_IP_, func);
arch_send_call_function_single_ipi(cpu);
}
}
@ -346,7 +346,7 @@ void __smp_call_single_queue(int cpu, struct llist_node *node)
* even if we haven't sent the smp_call IPI yet (e.g. the stopper
* executes migration_cpu_stop() on the remote CPU).
*/
if (trace_ipi_send_cpumask_enabled()) {
if (trace_ipi_send_cpu_enabled()) {
call_single_data_t *csd;
smp_call_func_t func;