linux-kernel - [RFC PATCH v10 6/8] perf stat: Add command line option for enabling tpebs recording

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Date: Wed, 29 May 2024 02:43:22 -0400
From: weilin.wang@...el.com
To: weilin.wang@...el.com,
	Namhyung Kim <namhyung@...nel.org>,
	Ian Rogers <irogers@...gle.com>,
	Arnaldo Carvalho de Melo <acme@...nel.org>,
	Peter Zijlstra <peterz@...radead.org>,
	Ingo Molnar <mingo@...hat.com>,
	Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
	Jiri Olsa <jolsa@...nel.org>,
	Adrian Hunter <adrian.hunter@...el.com>,
	Kan Liang <kan.liang@...ux.intel.com>
Cc: linux-perf-users@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	Perry Taylor <perry.taylor@...el.com>,
	Samantha Alt <samantha.alt@...el.com>,
	Caleb Biggers <caleb.biggers@...el.com>
Subject: [RFC PATCH v10 6/8] perf stat: Add command line option for enabling tpebs recording

From: Weilin Wang <weilin.wang@...el.com>

With this command line option, tpebs recording is turned off in perf stat on
default. It will only be turned on when this option is given in perf stat
command.

Exampe with --enable-tpebs-recording:

perf stat -M tma_dtlb_store -a --enable-tpebs-recording sleep 1

[ perf record: Woken up 1 times to write data ]
[ perf record: Captured and wrote 0.000 MB - ]

 Performance counter stats for 'system wide':

       181,047,168      cpu_core/TOPDOWN.SLOTS/          #      0.6 %  tma_dtlb_store
         3,195,608      cpu_core/topdown-retiring/
        40,156,649      cpu_core/topdown-mem-bound/
         3,550,925      cpu_core/topdown-bad-spec/
       117,571,818      cpu_core/topdown-fe-bound/
        57,118,087      cpu_core/topdown-be-bound/
            69,179      cpu_core/EXE_ACTIVITY.BOUND_ON_STORES/
             4,582      cpu_core/MEM_INST_RETIRED.STLB_HIT_STORES/
        30,183,104      cpu_core/CPU_CLK_UNHALTED.DISTRIBUTED/
        30,556,790      cpu_core/CPU_CLK_UNHALTED.THREAD/
           168,486      cpu_core/DTLB_STORE_MISSES.WALK_ACTIVE/
                 0      MEM_INST_RETIRED.STLB_HIT_STORES:R

       1.003105924 seconds time elapsed

Exampe without --enable-tpebs-recording:

perf stat -M tma_dtlb_store -a sleep 1

 Performance counter stats for 'system wide':

       181,047,168      cpu_core/TOPDOWN.SLOTS/          #      0.6 %  tma_dtlb_store
         3,195,608      cpu_core/topdown-retiring/
        40,156,649      cpu_core/topdown-mem-bound/
         3,550,925      cpu_core/topdown-bad-spec/
       117,571,818      cpu_core/topdown-fe-bound/
        57,118,087      cpu_core/topdown-be-bound/
            69,179      cpu_core/EXE_ACTIVITY.BOUND_ON_STORES/
             4,582      cpu_core/MEM_INST_RETIRED.STLB_HIT_STORES/
        30,183,104      cpu_core/CPU_CLK_UNHALTED.DISTRIBUTED/
        30,556,790      cpu_core/CPU_CLK_UNHALTED.THREAD/
           168,486      cpu_core/DTLB_STORE_MISSES.WALK_ACTIVE/
                 0      MEM_INST_RETIRED.STLB_HIT_STORES:R

       1.003105924 seconds time elapsed

Signed-off-by: Weilin Wang <weilin.wang@...el.com>
---
 tools/perf/builtin-stat.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/tools/perf/builtin-stat.c b/tools/perf/builtin-stat.c
index b09cb2c6e9c2..4530e4caa417 100644
--- a/tools/perf/builtin-stat.c
+++ b/tools/perf/builtin-stat.c
@@ -1237,6 +1237,8 @@ static struct option stat_options[] = {
 		       "disable adding events for the metric threshold calculation"),
 	OPT_BOOLEAN(0, "topdown", &topdown_run,
 			"measure top-down statistics"),
+	OPT_BOOLEAN(0, "enable-tpebs-recording", &tpebs_recording,
+			"enable recording for tpebs when retire_latency required"),
 	OPT_UINTEGER(0, "td-level", &stat_config.topdown_level,
 			"Set the metrics level for the top-down statistics (0: max level)"),
 	OPT_BOOLEAN(0, "smi-cost", &smi_cost,
-- 
2.43.0