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perf mem/c2c: Set PERF_SAMPLE_WEIGHT for LOAD_STORE events 

Bugzilla: https://bugzilla.redhat.com/2177180

upstream
========
commit 4173cc055dc92f199a43775775e54dc7fafd37b6
Author: Ravi Bangoria <ravi.bangoria@amd.com>
Date: Thu Oct 6 21:09:42 2022 +0530

description
===========
Currently perf sets PERF_SAMPLE_WEIGHT flag only for mem load events.
Set it for combined load-store event as well which will enable recording
of load latency by default on arch that does not support independent
mem load event.

Also document missing -W in perf-record man page.

    Signed-off-by: Ravi Bangoria <ravi.bangoria@amd.com>
    Acked-by: Jiri Olsa <jolsa@kernel.org>
    Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
    Cc: Ali Saidi <alisaidi@amazon.com>
    Cc: Ananth Narayan <ananth.narayan@amd.com>
    Cc: Andi Kleen <ak@linux.intel.com>
    Cc: Borislav Petkov <bp@alien8.de>
    Cc: Dave Hansen <dave.hansen@linux.intel.com>
    Cc: H. Peter Anvin <hpa@zytor.com>
    Cc: Ian Rogers <irogers@google.com>
    Cc: Ingo Molnar <mingo@redhat.com>
    Cc: Joe Mario <jmario@redhat.com>
    Cc: Kan Liang <kan.liang@linux.intel.com>
    Cc: Kim Phillips <kim.phillips@amd.com>
    Cc: Leo Yan <leo.yan@linaro.org>
    Cc: Mark Rutland <mark.rutland@arm.com>
    Cc: Namhyung Kim <namhyung@kernel.org>
    Cc: Peter Zijlstra <peterz@infradead.org>
    Cc: Sandipan Das <sandipan.das@amd.com>
    Cc: Santosh Shukla <santosh.shukla@amd.com>
    Cc: Stephane Eranian <eranian@google.com>
    Cc: Thomas Gleixner <tglx@linutronix.de>
    Cc: x86@kernel.org
    Link: https://lore.kernel.org/r/20221006153946.7816-5-ravi.bangoria@amd.com
    Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

Signed-off-by: Michael Petlan <mpetlan@redhat.com>
This commit is contained in:
Michael Petlan 2023-04-21 13:45:14 +02:00
parent 8541868592
commit 58e9de1177
3 changed files with 3 additions and 0 deletions
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1
tools/perf/Documentation/perf-record.txt
View File

@ -411,6 +411,7 @@ is enabled for all the sampling events. The sampled branch type is the same for
The various filters must be specified as a comma separated list: --branch-filter any_ret,u,k
Note that this feature may not be available on all processors.
-W::
--weight::
Enable weightened sampling. An additional weight is recorded per sample and can be
displayed with the weight and local_weight sort keys. This currently works for TSX

1
tools/perf/builtin-c2c.c
View File

@ -3284,6 +3284,7 @@ static int perf_c2c__record(int argc, const char **argv)
*/
if (e->tag) {
e->record = true;
rec_argv[i++] = "-W";
} else {
e = perf_mem_events__ptr(PERF_MEM_EVENTS__LOAD);
e->record = true;

1
tools/perf/builtin-mem.c
View File

@ -122,6 +122,7 @@ static int __cmd_record(int argc, const char **argv, struct perf_mem *mem)
(mem->operation & MEM_OPERATION_LOAD) &&
(mem->operation & MEM_OPERATION_STORE)) {
e->record = true;
rec_argv[i++] = "-W";
} else {
if (mem->operation & MEM_OPERATION_LOAD) {
e = perf_mem_events__ptr(PERF_MEM_EVENTS__LOAD);