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| author | Kan Liang <kan.liang@linux.intel.com> | 2023-10-25 23:16:20 +0300 |
|---|---|---|
| committer | Peter Zijlstra <peterz@infradead.org> | 2023-10-27 16:05:09 +0300 |
| commit | 85846b27072defc7ab3dcee7ff36563a040079dc (patch) | |
| tree | 287c12b68fe5e265b16b874576af953d44c0a57f /arch/x86/events/perf_event_flags.h | |
| parent | 571d91dcadfa3cef499010b4eddb9b58b0da4d24 (diff) | |
| download | linux-85846b27072defc7ab3dcee7ff36563a040079dc.tar.xz | |
perf/x86: Add PERF_X86_EVENT_NEEDS_BRANCH_STACK flag
Currently, branch_sample_type !=0 is used to check whether a branch
stack setup is required. But it doesn't check the sample type,
unnecessary branch stack setup may be done for a counting event. E.g.,
perf record -e "{branch-instructions,branch-misses}:S" -j any
Also, the event only with the new PERF_SAMPLE_BRANCH_COUNTERS branch
sample type may not require a branch stack setup either.
Add a new flag NEEDS_BRANCH_STACK to indicate whether the event requires
a branch stack setup. Replace the needs_branch_stack() by checking the
new flag.
The counting event check is implemented here. The later patch will take
the new PERF_SAMPLE_BRANCH_COUNTERS into account.
Signed-off-by: Kan Liang <kan.liang@linux.intel.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Link: https://lkml.kernel.org/r/20231025201626.3000228-2-kan.liang@linux.intel.com
Diffstat (limited to 'arch/x86/events/perf_event_flags.h')
| -rw-r--r-- | arch/x86/events/perf_event_flags.h | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/arch/x86/events/perf_event_flags.h b/arch/x86/events/perf_event_flags.h index 1dc19b9b4426..a1685981c520 100644 --- a/arch/x86/events/perf_event_flags.h +++ b/arch/x86/events/perf_event_flags.h @@ -20,3 +20,4 @@ PERF_ARCH(TOPDOWN, 0x04000) /* Count Topdown slots/metrics events */ PERF_ARCH(PEBS_STLAT, 0x08000) /* st+stlat data address sampling */ PERF_ARCH(AMD_BRS, 0x10000) /* AMD Branch Sampling */ PERF_ARCH(PEBS_LAT_HYBRID, 0x20000) /* ld and st lat for hybrid */ +PERF_ARCH(NEEDS_BRANCH_STACK, 0x40000) /* require branch stack setup */ |