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perf/x86: Add a x86_pmu::limit_period static_call

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Avoid a branch and indirect call.

Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Link: https://lkml.kernel.org/r/20220829101321.640658334@infradead.org
This commit is contained in:
Peter Zijlstra 2022-05-10 21:28:18 +02:00
parent 28f0f3c44b
commit 08b3068fab
1 changed files with 5 additions and 4 deletions
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9
arch/x86/events/core.c
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@ -72,8 +72,9 @@ DEFINE_STATIC_CALL_NULL(x86_pmu_add, *x86_pmu.add);
DEFINE_STATIC_CALL_NULL(x86_pmu_del, *x86_pmu.del);
DEFINE_STATIC_CALL_NULL(x86_pmu_read, *x86_pmu.read);
DEFINE_STATIC_CALL_NULL(x86_pmu_set_period, *x86_pmu.set_period);
DEFINE_STATIC_CALL_NULL(x86_pmu_update, *x86_pmu.update);
DEFINE_STATIC_CALL_NULL(x86_pmu_set_period, *x86_pmu.set_period);
DEFINE_STATIC_CALL_NULL(x86_pmu_update, *x86_pmu.update);
DEFINE_STATIC_CALL_NULL(x86_pmu_limit_period, *x86_pmu.limit_period);
DEFINE_STATIC_CALL_NULL(x86_pmu_schedule_events, *x86_pmu.schedule_events);
DEFINE_STATIC_CALL_NULL(x86_pmu_get_event_constraints, *x86_pmu.get_event_constraints);
@ -1396,8 +1397,7 @@ int x86_perf_event_set_period(struct perf_event *event)
if (left > x86_pmu.max_period)
left = x86_pmu.max_period;
if (x86_pmu.limit_period)
x86_pmu.limit_period(event, &left);
static_call_cond(x86_pmu_limit_period)(event, &left);
this_cpu_write(pmc_prev_left[idx], left);
@ -2024,6 +2024,7 @@ static void x86_pmu_static_call_update(void)
static_call_update(x86_pmu_set_period, x86_pmu.set_period);
static_call_update(x86_pmu_update, x86_pmu.update);
static_call_update(x86_pmu_limit_period, x86_pmu.limit_period);
static_call_update(x86_pmu_schedule_events, x86_pmu.schedule_events);
static_call_update(x86_pmu_get_event_constraints, x86_pmu.get_event_constraints);