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| author | Like Xu <likexu@tencent.com> | 2022-05-19 18:19:13 +0300 |
|---|---|---|
| committer | Peter Zijlstra <peterz@infradead.org> | 2022-06-13 11:15:13 +0300 |
| commit | e60b7cb089f216a26d478f5ad8f811a1de65f382 (patch) | |
| tree | 87f899309ab0194db2db322fb6afebd5e23c0500 /lib/mpi/mpiutil.c | |
| parent | b13baccc3850ca8b8cccbf8ed9912dbaa0fdf7f3 (diff) | |
| download | linux-e60b7cb089f216a26d478f5ad8f811a1de65f382.tar.xz | |
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
Diffstat (limited to 'lib/mpi/mpiutil.c')
0 files changed, 0 insertions, 0 deletions