The following commit has been merged into the perf/core branch of tip:
Commit-ID: e60b7cb089f216a26d478f5ad8f811a1de65f382
Gitweb: https://git.kernel.org/tip/e60b7cb089f216a26d478f5ad8f811a1de65f382
Author: Like Xu <likexu@xxxxxxxxxxx>
AuthorDate: Thu, 19 May 2022 23:19:13 +08:00
Committer: Peter Zijlstra <peterz@xxxxxxxxxxxxx>
CommitterDate: Mon, 13 Jun 2022 10:15:13 +02:00
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@xxxxxxxxxxx>
Signed-off-by: Like Xu <likexu@xxxxxxxxxxx>
Signed-off-by: Peter Zijlstra (Intel) <peterz@xxxxxxxxxxxxx>
Link: https://lkml.kernel.org/r/20220519151913.80545-1-likexu@xxxxxxxxxxx
---
arch/x86/events/perf_event.h | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)
diff --git a/arch/x86/events/perf_event.h b/arch/x86/events/perf_event.h
index 21a5482..1ca6200 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) | \
|