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| author | Like Xu <likexu@tencent.com> | 2022-05-19 23:19:13 +0800 |
|---|---|---|
| committer | Peter Zijlstra <peterz@infradead.org> | 2022-06-13 10:15:13 +0200 |
| commit | e60b7cb089f216a26d478f5ad8f811a1de65f382 (patch) | |
| tree | 87f899309ab0194db2db322fb6afebd5e23c0500 | |
| parent | b13baccc3850ca8b8cccbf8ed9912dbaa0fdf7f3 (diff) | |
| download | linux-e60b7cb089f216a26d478f5ad8f811a1de65f382.tar.bz2 | |
x86/events/intel/ds: Enable large PEBS for PERF_SAMPLE_WEIGHT_TYPE
All the information required by the PERF_SAMPLE_WEIGHT is
available in the pebs record. Thus large PEBS could be enabled
for PERF_SAMPLE_WEIGHT sample type to save PMIs overhead until
other non-compatible flags such as PERF_SAMPLE_DATA_PAGE_SIZE
(due to lack of munmap tracking) stop it.
To cover new weight extension, add PERF_SAMPLE_WEIGHT_TYPE
to the guardian LARGE_PEBS_FLAGS.
Tested it with:
$ perf mem record -c 1000 workload
Before: Captured and wrote 0.126 MB perf.data (958 samples) [958 PMIs]
After: Captured and wrote 0.313 MB perf.data (4859 samples) [3 PMIs]
Reported-by: Yongchao Duan <yongduan@tencent.com>
Signed-off-by: Like Xu <likexu@tencent.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Link: https://lkml.kernel.org/r/20220519151913.80545-1-likexu@tencent.com
| -rw-r--r-- | arch/x86/events/perf_event.h | 3 |
1 files changed, 2 insertions, 1 deletions
diff --git a/arch/x86/events/perf_event.h b/arch/x86/events/perf_event.h index 21a5482bcf84..1ca6200ca135 100644 --- a/arch/x86/events/perf_event.h +++ b/arch/x86/events/perf_event.h @@ -136,7 +136,8 @@ struct amd_nb { PERF_SAMPLE_DATA_SRC | PERF_SAMPLE_IDENTIFIER | \ PERF_SAMPLE_TRANSACTION | PERF_SAMPLE_PHYS_ADDR | \ PERF_SAMPLE_REGS_INTR | PERF_SAMPLE_REGS_USER | \ - PERF_SAMPLE_PERIOD | PERF_SAMPLE_CODE_PAGE_SIZE) + PERF_SAMPLE_PERIOD | PERF_SAMPLE_CODE_PAGE_SIZE | \ + PERF_SAMPLE_WEIGHT_TYPE) #define PEBS_GP_REGS \ ((1ULL << PERF_REG_X86_AX) | \ |