linux-kernel - Re: [PATCH] perf top: Use evsel's cpus to replace user_requested

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Date: Fri, 15 Dec 2023 15:26:46 -0300
From: Arnaldo Carvalho de Melo <acme@...nel.org>
To: "Liang, Kan" <kan.liang@...ux.intel.com>
Cc: Mark Rutland <mark.rutland@....com>, Ian Rogers <irogers@...gle.com>,
	Namhyung Kim <namhyung@...nel.org>, maz@...nel.org,
	marcan@...can.st, linux-kernel@...r.kernel.org,
	linux-perf-users@...r.kernel.org
Subject: Re: [PATCH] perf top: Use evsel's cpus to replace user_requested_cpus

Em Fri, Dec 15, 2023 at 12:59:22PM -0500, Liang, Kan escreveu:
> On 2023-12-15 10:36 a.m., Arnaldo Carvalho de Melo wrote:
> 
> #perf report --header-only | grep event
> # event : name = cpu_atom/cycles:P/, , id = { 7360, 7361, 7362, 7363,
> 7364, 7365, 7366, 7367, 7368, 7369 }, type = 0 (PERF_TYPE_HARDWARE),
> size = 136, config = 0xa00000000, { sample_period, sample_freq } = 3000,
> sample_type = IP|TID|TIME|PERIOD|IDENTIFIER, read_format = ID|LOST,
> disabled = 1, inherit = 1, freq = 1, enable_on_exec = 1, precise_ip = 3,
> sample_id_all = 1
> # event : name = cpu_core/cycles:P/, , id = { 7370, 7371, 7372, 7373,
> 7374, 7375, 7376, 7377, 7378, 7379, 7380, 7381 }, type = 0
> (PERF_TYPE_HARDWARE), size = 136, config = 0x400000000, { sample_period,
> sample_freq } = 3000, sample_type = IP|TID|TIME|PERIOD|IDENTIFIER,
> read_format = ID|LOST, disabled = 1, inherit = 1, freq = 1,
> enable_on_exec = 1, precise_ip = 3, sample_id_all = 1
> 
> I think we should move all the modifiers after the "/". The below patch
> can fix it.
> 
> https://lore.kernel.org/lkml/20231215175455.1300261-1-kan.liang@linux.intel.com/

Right, I implemented it in a slightly different way, but end result
should be the same:

>From 5dd1b7ab1ba69ebb8e070923dcc214b7b489ffc2 Mon Sep 17 00:00:00 2001
From: Arnaldo Carvalho de Melo <acme@...hat.com>
Date: Fri, 15 Dec 2023 15:23:30 -0300
Subject: [PATCH 1/1] perf evlist: Move event attributes to after the / when
 uniquefying using the PMU name

Signed-off-by: Arnaldo Carvalho de Melo <acme@...hat.com>
---
 tools/perf/util/evlist.c | 14 +++++++++++---
 1 file changed, 11 insertions(+), 3 deletions(-)

diff --git a/tools/perf/util/evlist.c b/tools/perf/util/evlist.c
index 6f0892803c2249af..3a9505c99490b372 100644
--- a/tools/perf/util/evlist.c
+++ b/tools/perf/util/evlist.c
@@ -2522,7 +2522,7 @@ void evlist__warn_user_requested_cpus(struct evlist *evlist, const char *cpu_lis
 void evlist__uniquify_name(struct evlist *evlist)
 {
 	struct evsel *pos;
-	char *new_name;
+	char *new_name, *attributes;
 	int ret;
 
 	if (perf_pmus__num_core_pmus() == 1)
@@ -2535,8 +2535,16 @@ void evlist__uniquify_name(struct evlist *evlist)
 		if (strchr(pos->name, '/'))
 			continue;
 
-		ret = asprintf(&new_name, "%s/%s/",
-			       pos->pmu_name, pos->name);
+		attributes = strchr(pos->name, ':');
+		if (attributes)
+			*attributes = '\0';
+
+		ret = asprintf(&new_name, "%s/%s/%s",
+			       pos->pmu_name, pos->name, attributes ? attributes + 1 : "");
+
+		if (attributes)
+			*attributes = ':';
+
 		if (ret) {
 			free(pos->name);
 			pos->name = new_name;
-- 
2.43.0