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From: Andi Kleen <andi@firstfloor.org>
To: acme@kernel.org
Cc: jolsa@kernel.org, linux-kernel@vger.kernel.org,
	eranian@google.com, namhyung@kernel.org, peterz@infradead.org,
	mingo@kernel.org, Andi Kleen <ak@linux.intel.com>
Subject: [PATCH 1/9] perf, tools: Dont stop PMU parsing on alias parse error
Date: Fri,  7 Aug 2015 18:06:17 -0700	[thread overview]
Message-ID: <1438995985-13631-2-git-send-email-andi@firstfloor.org> (raw)
In-Reply-To: <1438995985-13631-1-git-send-email-andi@firstfloor.org>

From: Andi Kleen <ak@linux.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).

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@linux.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 d4b0e64..ce56354 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;
 
-		ret = perf_pmu__new_alias(head, dir, name, file);
+		perf_pmu__new_alias(head, dir, name, file);
 		fclose(file);
 	}
 
 	closedir(event_dir);
-	return ret;
+	return 0;
 }
 
 /*
-- 
2.4.3


  reply	other threads:[~2015-08-08  1:06 UTC|newest]

Thread overview: 22+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2015-08-08  1:06 Add top down metrics to perf stat Andi Kleen
2015-08-08  1:06 ` Andi Kleen [this message]
2015-08-11 13:07   ` [PATCH 1/9] perf, tools: Dont stop PMU parsing on alias parse error Jiri Olsa
2015-08-11 13:14     ` Andi Kleen
2015-08-11 13:24       ` Jiri Olsa
2015-08-11 13:40         ` Andi Kleen
2015-08-11 14:39           ` Jiri Olsa
2015-08-11 16:59             ` Andi Kleen
2015-08-08  1:06 ` [PATCH 2/9] perf, tools, stat: Support up-scaling of events Andi Kleen
2015-08-11 13:25   ` Jiri Olsa
2015-08-11 13:38     ` Andi Kleen
2015-08-11 13:54       ` Jiri Olsa
2015-08-11 17:00         ` Andi Kleen
2015-08-11 17:13           ` Jiri Olsa
2015-08-11 17:17             ` Andi Kleen
2015-08-08  1:06 ` [PATCH 3/9] perf, tools, stat: Basic support for TopDown in perf stat Andi Kleen
2015-08-08  1:06 ` [PATCH 4/9] perf, tools, stat: Add computation of TopDown formulas Andi Kleen
2015-08-08  1:06 ` [PATCH 5/9] x86, perf: Support sysfs files depending on SMT status Andi Kleen
2015-08-08  1:06 ` [PATCH 6/9] x86, perf: Add Top Down events to Intel Core Andi Kleen
2015-08-08  1:06 ` [PATCH 7/9] x86, perf: Add Top Down events to Intel Atom Andi Kleen
2015-08-08  1:06 ` [PATCH 8/9] perf, tools, stat: Add extra output of counter values with -v Andi Kleen
2015-08-08  1:06 ` [PATCH 9/9] perf, tools, stat: Force --per-core mode for .agg-per-core aliases Andi Kleen

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