This is a note to let you know that I've just added the patch titled
perf tools: Dont stop PMU parsing on alias parse error
to the 4.4-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
perf-tools-dont-stop-pmu-parsing-on-alias-parse-error.patch
and it can be found in the queue-4.4 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From 940db6dcd3f4659303fdf6befe7416adc4d24118 Mon Sep 17 00:00:00 2001
From: Andi Kleen <ak@xxxxxxxxxxxxxxx>
Date: Wed, 17 Feb 2016 14:44:55 -0800
Subject: perf tools: Dont stop PMU parsing on alias parse error
From: Andi Kleen <ak@xxxxxxxxxxxxxxx>
commit 940db6dcd3f4659303fdf6befe7416adc4d24118 upstream.
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@xxxxxxxxxxxxxxx>
Cc: Jiri Olsa <jolsa@xxxxxxxxxx>
Link: http://lkml.kernel.org/r/1455749095-18358-1-git-send-email-andi@xxxxxxxxxxxxxx
Signed-off-by: Arnaldo Carvalho de Melo <acme@xxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
tools/perf/util/pmu.c | 15 ++++++++-------
1 file changed, 8 insertions(+), 7 deletions(-)
--- a/tools/perf/util/pmu.c
+++ b/tools/perf/util/pmu.c
@@ -283,13 +283,12 @@ static int pmu_aliases_parse(char *dir,
{
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 +304,19 @@ static int pmu_aliases_parse(char *dir,
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;
}
/*
Patches currently in stable-queue which might be from ak@xxxxxxxxxxxxxxx are
queue-4.4/perf-tools-dont-stop-pmu-parsing-on-alias-parse-error.patch
queue-4.4/x86-pci-mark-broadwell-ep-home-agent-pcu-as-having-non-compliant-bars.patch
queue-4.4/pci-disable-io-mem-decoding-for-devices-with-non-compliant-bars.patch
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