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Message-ID: <20151221160857.GA21700@krava.brq.redhat.com>
Date: Mon, 21 Dec 2015 17:08:57 +0100
From: Jiri Olsa <jolsa@...hat.com>
To: Andi Kleen <andi@...stfloor.org>
Cc: acme@...nel.org, peterz@...radead.org, jolsa@...nel.org,
mingo@...nel.org, linux-kernel@...r.kernel.org, eranian@...gle.com,
namhyung@...nel.org, Andi Kleen <ak@...ux.intel.com>
Subject: Re: [PATCH 01/10] perf, tools: Dont stop PMU parsing on alias parse
error
On Tue, Dec 15, 2015 at 04:54:17PM -0800, Andi Kleen wrote:
> From: Andi Kleen <ak@...ux.intel.com>
>
> 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).
I kind of recall seeing similar patch, but looks like
it never made it in
>
> 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.
>
> Signed-off-by: Andi Kleen <ak@...ux.intel.com>
> ---
> tools/perf/util/pmu.c | 10 ++++------
> 1 file changed, 4 insertions(+), 6 deletions(-)
>
> diff --git a/tools/perf/util/pmu.c b/tools/perf/util/pmu.c
> index e4b173d..8a520e9 100644
> --- a/tools/perf/util/pmu.c
> +++ b/tools/perf/util/pmu.c
> @@ -283,13 +283,12 @@ 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;
> @@ -305,17 +304,16 @@ 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;
> + continue;
I think we should emit warning in case of failure to let user know
>
> - ret = perf_pmu__new_alias(head, dir, name, file);
same here
> + perf_pmu__new_alias(head, dir, name, file);
> fclose(file);
> }
>
thanks,
jirka
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