From 89fb1ca2abb7fba6587a5768cfee9f89daf9be6f Mon Sep 17 00:00:00 2001 From: Namhyung Kim Date: Thu, 24 Sep 2020 21:44:54 +0900 Subject: perf tools: Allow creation of cgroup without open 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 Acked-by: Jiri Olsa Cc: Alexander Shishkin Cc: Andi Kleen Cc: Ian Rogers Cc: Mark Rutland Cc: Peter Zijlstra Cc: Stephane Eranian Link: http://lore.kernel.org/lkml/20200924124455.336326-5-namhyung@kernel.org Signed-off-by: Arnaldo Carvalho de Melo --- tools/perf/util/cgroup.c | 19 ++++++++++++------- tools/perf/util/cgroup.h | 2 +- 2 files changed, 13 insertions(+), 8 deletions(-) (limited to 'tools/perf/util') diff --git a/tools/perf/util/cgroup.c b/tools/perf/util/cgroup.c index 6e64c908fa71..b81324a13a2b 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; @@ -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; 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); -- cgit v1.2.3-59-g8ed1b