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authorArnaldo Carvalho de Melo <acme@redhat.com>2018-03-06 21:53:22 +0300
committerArnaldo Carvalho de Melo <acme@redhat.com>2018-03-07 16:22:26 +0300
commit3b5692864da3a8dec95d8c757147f436d19f8ff7 (patch)
tree03172f4f90dbfe5145a6196d84edbba33557fd1b /tools/perf/util/cgroup.c
parent483322dda03a7ad807e82f9c25fac315a4eee1c5 (diff)
downloadlinux-3b5692864da3a8dec95d8c757147f436d19f8ff7.tar.xz
perf cgroup: Make the cgroup name be const char *
The usual thing is for a constructor to allocate space for its members, not to require that the caller pass a pre-allocated 'name' and then, at its destructor, to free something not allocated by it. Fix it by making cgroup__new() to receive a const char pointer, then allocate cgroup->name that then can continue to be freed at cgroup__delete(), balancing the alloc/free operations inside the cgroup struct methods. This eases calling evlist__findnew_cgroup() from the custom 'perf trace' cgroup parser, that will only call parse_cgroups() when the '-G cgroup' is passed on the command line after '-e event' entries, when it'll behave just like 'perf stat' and 'perf record', i.e. the previous parse_cgroup() users that mandate that -G only can come after a -e. 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-4leugnuyqi10t98990o3xi1t@git.kernel.org Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Diffstat (limited to 'tools/perf/util/cgroup.c')
-rw-r--r--tools/perf/util/cgroup.c24
1 files changed, 14 insertions, 10 deletions
diff --git a/tools/perf/util/cgroup.c b/tools/perf/util/cgroup.c
index d8cd0e601c56..78408f5c4bad 100644
--- a/tools/perf/util/cgroup.c
+++ b/tools/perf/util/cgroup.c
@@ -71,7 +71,7 @@ cgroupfs_find_mountpoint(char *buf, size_t maxlen)
return -1;
}
-static int open_cgroup(char *name)
+static int open_cgroup(const char *name)
{
char path[PATH_MAX + 1];
char mnt[PATH_MAX + 1];
@@ -90,7 +90,7 @@ static int open_cgroup(char *name)
return fd;
}
-static struct cgroup *evlist__find_cgroup(struct perf_evlist *evlist, char *str)
+static struct cgroup *evlist__find_cgroup(struct perf_evlist *evlist, const char *str)
{
struct perf_evsel *counter;
struct cgroup *cgrp = NULL;
@@ -109,33 +109,38 @@ static struct cgroup *evlist__find_cgroup(struct perf_evlist *evlist, char *str)
return cgrp;
}
-static struct cgroup *cgroup__new(char *name)
+static struct cgroup *cgroup__new(const char *name)
{
struct cgroup *cgroup = zalloc(sizeof(*cgroup));
if (cgroup != NULL) {
- cgroup->name = name;
refcount_set(&cgroup->refcnt, 1);
+ cgroup->name = strdup(name);
+ if (!cgroup->name)
+ goto out_err;
cgroup->fd = open_cgroup(name);
if (cgroup->fd == -1)
- goto out_err;
+ goto out_free_name;
}
return cgroup;
+
+out_free_name:
+ free(cgroup->name);
out_err:
free(cgroup);
return NULL;
}
-struct cgroup *evlist__findnew_cgroup(struct perf_evlist *evlist, char *name)
+struct cgroup *evlist__findnew_cgroup(struct perf_evlist *evlist, const 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)
+static int add_cgroup(struct perf_evlist *evlist, const char *str)
{
struct perf_evsel *counter;
struct cgroup *cgrp = evlist__findnew_cgroup(evlist, str);
@@ -222,10 +227,9 @@ int parse_cgroups(const struct option *opt, const char *str,
if (!s)
return -1;
ret = add_cgroup(evlist, s);
- if (ret) {
- free(s);
+ free(s);
+ if (ret)
return -1;
- }
}
/* nr_cgroups is increased een for empty cgroups */
nr_cgroups++;