Messages in this thread Patch in this message | | | Date | Mon, 29 Aug 2022 12:10:03 +0200 | From | Peter Zijlstra <> | Subject | [PATCH v2 4/9] 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> --- arch/x86/events/core.c | 9 +++++---- 1 file changed, 5 insertions(+), 4 deletions(-)
--- a/arch/x86/events/core.c +++ b/arch/x86/events/core.c @@ -72,8 +72,9 @@ DEFINE_STATIC_CALL_NULL(x86_pmu_add, *x 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); @@ -1391,8 +1392,7 @@ int x86_perf_event_set_period(struct per 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); @@ -2017,6 +2017,7 @@ static void x86_pmu_static_call_update(v 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);
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