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Subject[PATCH 11/54] perf cgroup: Add evlist__findnew_cgroup()
Date
From: Arnaldo Carvalho de Melo <acme@redhat.com>

Similar to machine__findnew_thread(), etc, i.e. try to find, get a
refcount if found and return it, otherwise return a new cgroup object.

Cc: Adrian Hunter <adrian.hunter@intel.com>
Cc: David Ahern <dsahern@gmail.com>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Stephane Eranian <eranian@google.com>
Cc: Wang Nan <wangnan0@huawei.com>
Link: https://lkml.kernel.org/n/tip-im1omevlihhyneiic4nl3g24@git.kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
---
tools/perf/util/cgroup.c | 17 ++++++++++-------
tools/perf/util/cgroup.h | 4 ++++
2 files changed, 14 insertions(+), 7 deletions(-)

diff --git a/tools/perf/util/cgroup.c b/tools/perf/util/cgroup.c
index 26a837037797..6fd33ffc2488 100644
--- a/tools/perf/util/cgroup.c
+++ b/tools/perf/util/cgroup.c
@@ -128,18 +128,21 @@ static struct cgroup *cgroup__new(char *name)
return NULL;
}

+struct cgroup *evlist__findnew_cgroup(struct perf_evlist *evlist, char *name)
+{
+ struct cgroup *cgroup = evlist__find_cgroup(evlist, name);
+
+ return cgroup ?: cgroup__new(name);
+}
+
static int add_cgroup(struct perf_evlist *evlist, char *str)
{
struct perf_evsel *counter;
- struct cgroup *cgrp = evlist__find_cgroup(evlist, str);
+ struct cgroup *cgrp = evlist__findnew_cgroup(evlist, str);
int n;

- if (!cgrp) {
- cgrp = cgroup__new(str);
- if (!cgrp)
- return -1;
- }
-
+ if (!cgrp)
+ return -1;
/*
* find corresponding event
* if add cgroup N, then need to find event N
diff --git a/tools/perf/util/cgroup.h b/tools/perf/util/cgroup.h
index 34a6c11543dc..0e377e6340dd 100644
--- a/tools/perf/util/cgroup.h
+++ b/tools/perf/util/cgroup.h
@@ -18,6 +18,10 @@ extern int nr_cgroups; /* number of explicit cgroups defined */
struct cgroup *cgroup__get(struct cgroup *cgroup);
void cgroup__put(struct cgroup *cgroup);

+struct perf_evlist;
+
+struct cgroup *evlist__findnew_cgroup(struct perf_evlist *evlist, char *name);
+
int parse_cgroups(const struct option *opt, const char *str, int unset);

#endif /* __CGROUP_H__ */
--
2.14.3
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