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From: Namhyung Kim <namhyung@kernel.org>
To: Arnaldo Carvalho de Melo <acme@kernel.org>, Jiri Olsa <jolsa@redhat.com>
Cc: Ingo Molnar <mingo@kernel.org>,
	Peter Zijlstra <a.p.zijlstra@chello.nl>,
	Mark Rutland <mark.rutland@arm.com>,
	Alexander Shishkin <alexander.shishkin@linux.intel.com>,
	LKML <linux-kernel@vger.kernel.org>,
	Stephane Eranian <eranian@google.com>,
	Andi Kleen <ak@linux.intel.com>, Ian Rogers <irogers@google.com>
Subject: [PATCH 4/5] perf tools: Allow creation of cgroup without open
Date: Wed, 23 Sep 2020 10:59:44 +0900	[thread overview]
Message-ID: <20200923015945.47535-5-namhyung@kernel.org> (raw)
In-Reply-To: <20200923015945.47535-1-namhyung@kernel.org>

This is a preparation for a test case of expanding events for multiple
cgroups.  Instead of using real system cgroup, the test will use fake
cgroups so it needs a way to have them without a open file descriptor.

Signed-off-by: Namhyung Kim <namhyung@kernel.org>
---
 tools/perf/builtin-stat.c |  2 +-
 tools/perf/util/cgroup.c  | 19 ++++++++++++-------
 tools/perf/util/cgroup.h  |  2 +-
 3 files changed, 14 insertions(+), 9 deletions(-)

diff --git a/tools/perf/builtin-stat.c b/tools/perf/builtin-stat.c
index 66a33d97192d..d9d5de6f3108 100644
--- a/tools/perf/builtin-stat.c
+++ b/tools/perf/builtin-stat.c
@@ -2256,7 +2256,7 @@ int cmd_stat(int argc, const char **argv)
 		}
 
 		if (evlist__expand_cgroup(evsel_list, stat_config.cgroup_list,
-					  &stat_config.metric_events) < 0)
+					  &stat_config.metric_events, true) < 0)
 			goto out;
 	}
 
diff --git a/tools/perf/util/cgroup.c b/tools/perf/util/cgroup.c
index dcd18ef268a1..d82f4cad762c 100644
--- a/tools/perf/util/cgroup.c
+++ b/tools/perf/util/cgroup.c
@@ -51,7 +51,7 @@ static struct cgroup *evlist__find_cgroup(struct evlist *evlist, const char *str
 	return NULL;
 }
 
-static struct cgroup *cgroup__new(const char *name)
+static struct cgroup *cgroup__new(const char *name, bool do_open)
 {
 	struct cgroup *cgroup = zalloc(sizeof(*cgroup));
 
@@ -61,9 +61,14 @@ static struct cgroup *cgroup__new(const char *name)
 		cgroup->name = strdup(name);
 		if (!cgroup->name)
 			goto out_err;
-		cgroup->fd = open_cgroup(name);
-		if (cgroup->fd == -1)
-			goto out_free_name;
+
+		if (do_open) {
+			cgroup->fd = open_cgroup(name);
+			if (cgroup->fd == -1)
+				goto out_free_name;
+		} else {
+			cgroup->fd = -1;
+		}
 	}
 
 	return cgroup;
@@ -79,7 +84,7 @@ struct cgroup *evlist__findnew_cgroup(struct evlist *evlist, const char *name)
 {
 	struct cgroup *cgroup = evlist__find_cgroup(evlist, name);
 
-	return cgroup ?: cgroup__new(name);
+	return cgroup ?: cgroup__new(name, true);
 }
 
 static int add_cgroup(struct evlist *evlist, const char *str)
@@ -197,7 +202,7 @@ int parse_cgroups(const struct option *opt, const char *str,
 }
 
 int evlist__expand_cgroup(struct evlist *evlist, const char *str,
-			  struct rblist *metric_events)
+			  struct rblist *metric_events, bool open_cgroup)
 {
 	struct evlist *orig_list, *tmp_list;
 	struct evsel *pos, *evsel, *leader;
@@ -235,7 +240,7 @@ int evlist__expand_cgroup(struct evlist *evlist, const char *str,
 			if (!name)
 				goto out_err;
 
-			cgrp = cgroup__new(name);
+			cgrp = cgroup__new(name, open_cgroup);
 			free(name);
 			if (cgrp == NULL)
 				goto out_err;
diff --git a/tools/perf/util/cgroup.h b/tools/perf/util/cgroup.h
index eea6df8ee373..162906f3412a 100644
--- a/tools/perf/util/cgroup.h
+++ b/tools/perf/util/cgroup.h
@@ -26,7 +26,7 @@ struct rblist;
 
 struct cgroup *evlist__findnew_cgroup(struct evlist *evlist, const char *name);
 int evlist__expand_cgroup(struct evlist *evlist, const char *cgroups,
-			  struct rblist *metric_events);
+			  struct rblist *metric_events, bool open_cgroup);
 
 void evlist__set_default_cgroup(struct evlist *evlist, struct cgroup *cgroup);
 
-- 
2.28.0.681.g6f77f65b4e-goog


  parent reply	other threads:[~2020-09-23  2:00 UTC|newest]

Thread overview: 12+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-09-23  1:59 [PATCHSET v4 0/5] perf stat: Expand events for each cgroup Namhyung Kim
2020-09-23  1:59 ` [PATCH 1/5] perf evsel: Add evsel__clone() function Namhyung Kim
2020-09-23  1:59 ` [PATCH 2/5] perf stat: Add --for-each-cgroup option Namhyung Kim
2020-09-23  1:59 ` [PATCH 3/5] perf tools: Copy metric events properly when expand cgroups Namhyung Kim
2020-09-23 10:22   ` Jiri Olsa
2020-09-24  3:12     ` Namhyung Kim
2020-09-23  1:59 ` Namhyung Kim [this message]
2020-09-23  1:59 ` [PATCH 5/5] perf test: Add expand cgroup event test Namhyung Kim
2020-09-23 22:36   ` Ian Rogers
2020-09-24  6:35     ` Namhyung Kim
  -- strict thread matches above, loose matches on Subject: below --
2020-09-24 12:44 [PATCHSET v5 0/5] perf stat: Expand events for each cgroup Namhyung Kim
2020-09-24 12:44 ` [PATCH 4/5] perf tools: Allow creation of cgroup without open Namhyung Kim
2020-09-21  9:46 [PATCHSET v3 0/5] perf stat: Expand events for each cgroup Namhyung Kim
2020-09-21  9:46 ` [PATCH 4/5] perf tools: Allow creation of cgroup without open Namhyung Kim

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