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perf cgroup: Introduce cgroup__get() 

The refcount operation counterpart to cgroup__put(), use it when reusing
a cgroup.

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-14ynvrl7y2cz8gyuy5q5v41g@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 10:18:40 -03:00
parent a53b646030
commit fc9ffb9cf0
2 changed files with 11 additions and 6 deletions
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16
tools/perf/util/cgroup.c
View File

@ -99,15 +99,12 @@ static int add_cgroup(struct perf_evlist *evlist, char *str)
* check if cgrp is already defined, if so we reuse it
*/
evlist__for_each_entry(evlist, counter) {
cgrp = counter->cgrp;
if (!cgrp)
if (!counter->cgrp)
continue;
if (!strcmp(cgrp->name, str)) {
refcount_inc(&cgrp->refcnt);
if (!strcmp(counter->cgrp->name, str)) {
cgrp = cgroup__get(counter->cgrp);
break;
}
cgrp = NULL;
}
if (!cgrp) {
@ -157,6 +154,13 @@ void cgroup__put(struct cgroup *cgrp)
}
}
struct cgroup *cgroup__get(struct cgroup *cgroup)
{
if (cgroup)
refcount_inc(&cgroup->refcnt);
return cgroup;
}
int parse_cgroups(const struct option *opt, const char *str,
int unset __maybe_unused)
{

1
tools/perf/util/cgroup.h
View File

@ -15,6 +15,7 @@ struct cgroup {
extern int nr_cgroups; /* number of explicit cgroups defined */
struct cgroup *cgroup__get(struct cgroup *cgroup);
void cgroup__put(struct cgroup *cgroup);
int parse_cgroups(const struct option *opt, const char *str, int unset);