[PATCH V8 03/12] perf/x86/intel: Do not enable large PEBS for events with aux actions or aux sampling

Adrian Hunter
2024-06-28T06:51:51Z

Events with aux actions or aux sampling expect the PMI to coincide with the
event, which does not happen for large PEBS, so do not enable large PEBS in
that case.

Signed-off-by: Adrian Hunter <adrian.hunter@intel.com>
Reviewed-by: Andi Kleen <ak@linux.intel.com>
---
arch/x86/events/intel/core.c | 10 ++++++++--
1 file changed, 8 insertions(+), 2 deletions(-)

diff --git a/arch/x86/events/intel/core.c b/arch/x86/events/intel/core.c
index 0e835dc134a5..7bc3762af271 100644
--- a/arch/x86/events/intel/core.c
+++ b/arch/x86/events/intel/core.c
@@ -3886,6 +3886,12 @@ static inline bool intel_pmu_has_cap(struct perf_event *event, int idx)
return test_bit(idx, (unsigned long *)&intel_cap->capabilities);
}

+static inline bool has_aux_action(struct perf_event *event)
+{
+ return event->attr.aux_pause || event->attr.aux_resume ||
+ event->attr.aux_sample_size;
+}
+
static int intel_pmu_hw_config(struct perf_event *event)
{
int ret = x86_pmu_hw_config(event);
@@ -3903,8 +3909,8 @@ static int intel_pmu_hw_config(struct perf_event *event)

if (!(event->attr.freq || (event->attr.wakeup_events && !event->attr.watermark))) {
event->hw.flags |= PERF_X86_EVENT_AUTO_RELOAD;
- if (!(event->attr.sample_type &
- ~intel_pmu_large_pebs_flags(event))) {
+ if (!(event->attr.sample_type & ~intel_pmu_large_pebs_flags(event)) &&
+ !has_aux_action(event)) {
event->hw.flags |= PERF_X86_EVENT_LARGE_PEBS;
event->attach_state |= PERF_ATTACH_SCHED_CB;
}
--
2.34.1