linux-kernel - [RFC PATCH v10 1/8] perf parse-events: Add a retirement latency modifier

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Date: Wed, 29 May 2024 02:43:17 -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 1/8] perf parse-events: Add a retirement latency modifier

From: Ian Rogers <irogers@...gle.com>

Retirement latency is a separate sampled count used on newer Intel
CPUs.

Signed-off-by: Ian Rogers <irogers@...gle.com>
Signed-off-by: Weilin Wang <weilin.wang@...el.com>
---
 tools/perf/util/evsel.h        | 1 +
 tools/perf/util/parse-events.c | 2 ++
 tools/perf/util/parse-events.h | 1 +
 tools/perf/util/parse-events.l | 3 ++-
 4 files changed, 6 insertions(+), 1 deletion(-)

diff --git a/tools/perf/util/evsel.h b/tools/perf/util/evsel.h
index 43f6fd1dcb4d..bd8e84954e34 100644
--- a/tools/perf/util/evsel.h
+++ b/tools/perf/util/evsel.h
@@ -98,6 +98,7 @@ struct evsel {
 		bool			bpf_counter;
 		bool			use_config_name;
 		bool			skippable;
+		bool			retire_lat;
 		int			bpf_fd;
 		struct bpf_object	*bpf_obj;
 		struct list_head	config_terms;
diff --git a/tools/perf/util/parse-events.c b/tools/perf/util/parse-events.c
index 0f308b4db2b9..9c2a76ec8c99 100644
--- a/tools/perf/util/parse-events.c
+++ b/tools/perf/util/parse-events.c
@@ -1818,6 +1818,8 @@ static int parse_events__modifier_list(struct parse_events_state *parse_state,
 			evsel->weak_group = true;
 		if (mod.bpf)
 			evsel->bpf_counter = true;
+		if (mod.retire_lat)
+			evsel->retire_lat = true;
 	}
 	return 0;
 }
diff --git a/tools/perf/util/parse-events.h b/tools/perf/util/parse-events.h
index 5695308efab9..eb94d1247dae 100644
--- a/tools/perf/util/parse-events.h
+++ b/tools/perf/util/parse-events.h
@@ -201,6 +201,7 @@ struct parse_events_modifier {
 	bool hypervisor : 1;	/* 'h' */
 	bool guest : 1;		/* 'G' */
 	bool host : 1;		/* 'H' */
+	bool retire_lat : 1;	/* 'R' */
 };
 
 int parse_events__modifier_event(struct parse_events_state *parse_state, void *loc,
diff --git a/tools/perf/util/parse-events.l b/tools/perf/util/parse-events.l
index 08ea2d845dc3..85015f080240 100644
--- a/tools/perf/util/parse-events.l
+++ b/tools/perf/util/parse-events.l
@@ -209,6 +209,7 @@ static int modifiers(struct parse_events_state *parse_state, yyscan_t scanner)
 		CASE('W', weak);
 		CASE('e', exclusive);
 		CASE('b', bpf);
+		CASE('R', retire_lat);
 		default:
 			return PE_ERROR;
 		}
@@ -250,7 +251,7 @@ drv_cfg_term	[a-zA-Z0-9_\.]+(=[a-zA-Z0-9_*?\.:]+)?
  * If you add a modifier you need to update check_modifier().
  * Also, the letters in modifier_event must not be in modifier_bp.
  */
-modifier_event	[ukhpPGHSDIWeb]{1,15}
+modifier_event	[ukhpPGHSDIWebR]{1,16}
 modifier_bp	[rwx]{1,3}
 lc_type 	(L1-dcache|l1-d|l1d|L1-data|L1-icache|l1-i|l1i|L1-instruction|LLC|L2|dTLB|d-tlb|Data-TLB|iTLB|i-tlb|Instruction-TLB|branch|branches|bpu|btb|bpc|node)
 lc_op_result	(load|loads|read|store|stores|write|prefetch|prefetches|speculative-read|speculative-load|refs|Reference|ops|access|misses|miss)
-- 
2.43.0