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perf tools: Allow creation of cgroup without open

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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>
Acked-by: Jiri Olsa <jolsa@redhat.com>
Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Cc: Andi Kleen <ak@linux.intel.com>
Cc: Ian Rogers <irogers@google.com>
Cc: Mark Rutland <mark.rutland@arm.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Stephane Eranian <eranian@google.com>
Link: http://lore.kernel.org/lkml/20200924124455.336326-5-namhyung@kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
This commit is contained in:
Namhyung Kim 2020-09-24 21:44:54 +09:00 committed by Arnaldo Carvalho de Melo
parent b214ba8c42
commit 89fb1ca2ab
3 changed files with 14 additions and 9 deletions
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2
tools/perf/builtin-stat.c
View File

@ -2235,7 +2235,7 @@ 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;
}

19
tools/perf/util/cgroup.c
View File

@ -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;
@ -240,7 +245,7 @@ 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;

2
tools/perf/util/cgroup.h
View File

@ -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);