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perf cgroup: Add evlist__findnew_cgroup()

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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>
This commit is contained in:
Arnaldo Carvalho de Melo 2018-03-06 15:27:08 -03:00
parent 4b5ea3bd67
commit 69239ec81d
2 changed files with 14 additions and 7 deletions
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13
tools/perf/util/cgroup.c
View File

@ -128,18 +128,21 @@ out_err:
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;
}
/*
* find corresponding event
* if add cgroup N, then need to find event N

4
tools/perf/util/cgroup.h
View File

@ -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__ */