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perf tools: Dont stop PMU parsing on alias parse error 

When an error happens during alias parsing currently the complete
parsing of all attributes of the PMU is stopped. This is breaks old perf
on a newer kernel that may have not-yet-know alias attributes (such as
.scale or .per-pkg).

Continue when some attribute is unparseable.

This is IMHO a stable candidate and should be backported to older
versions to avoid problems with newer kernels.

v2: Print warnings when something goes wrong.
v3: Change warning to debug output

Signed-off-by: Andi Kleen <ak@linux.intel.com>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: stable@vger.kernel.org # v3.6+
Link: http://lkml.kernel.org/r/1455749095-18358-1-git-send-email-andi@firstfloor.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
This commit is contained in:
Andi Kleen 2016-02-17 14:44:55 -08:00 committed by Arnaldo Carvalho de Melo
parent ff7b191583
commit 940db6dcd3
1 changed files with 8 additions and 7 deletions
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15
tools/perf/util/pmu.c
View File

@ -284,13 +284,12 @@ static int pmu_aliases_parse(char *dir, struct list_head *head)
{
struct dirent *evt_ent;
DIR *event_dir;
int ret = 0;
event_dir = opendir(dir);
if (!event_dir)
return -EINVAL;
while (!ret && (evt_ent = readdir(event_dir))) {
while ((evt_ent = readdir(event_dir))) {
char path[PATH_MAX];
char *name = evt_ent->d_name;
FILE *file;
@ -306,17 +305,19 @@ static int pmu_aliases_parse(char *dir, struct list_head *head)
snprintf(path, PATH_MAX, "%s/%s", dir, name);
ret = -EINVAL;
file = fopen(path, "r");
if (!file)
break;
if (!file) {
pr_debug("Cannot open %s\n", path);
continue;
}
ret = perf_pmu__new_alias(head, dir, name, file);
if (perf_pmu__new_alias(head, dir, name, file) < 0)
pr_debug("Cannot set up %s\n", name);
fclose(file);
}
closedir(event_dir);
return ret;
return 0;
}
/*