x86/events/intel/ds: Enable large PEBS for PERF_SAMPLE_WEIGHT_TYPE
authorLike Xu <likexu@tencent.com>
Thu, 19 May 2022 15:19:13 +0000 (23:19 +0800)
committerPeter Zijlstra <peterz@infradead.org>
Mon, 13 Jun 2022 08:15:13 +0000 (10:15 +0200)
commite60b7cb089f216a26d478f5ad8f811a1de65f382
tree87f899309ab0194db2db322fb6afebd5e23c0500
parentb13baccc3850ca8b8cccbf8ed9912dbaa0fdf7f3
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
arch/x86/events/perf_event.h