linux-kernel - Re: [PATCH 1/9] perf, tools: Dont stop PMU parsing on alias parse error

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Date:	Tue, 11 Aug 2015 16:39:17 +0200
From:	Jiri Olsa <jolsa@...hat.com>
To:	Andi Kleen <ak@...ux.intel.com>
Cc:	Andi Kleen <andi@...stfloor.org>, acme@...nel.org,
	jolsa@...nel.org, linux-kernel@...r.kernel.org, eranian@...gle.com,
	namhyung@...nel.org, peterz@...radead.org, mingo@...nel.org
Subject: Re: [PATCH 1/9] perf, tools: Dont stop PMU parsing on alias parse
 error

On Tue, Aug 11, 2015 at 06:40:27AM -0700, Andi Kleen wrote:
> On Tue, Aug 11, 2015 at 03:24:27PM +0200, Jiri Olsa wrote:
> > On Tue, Aug 11, 2015 at 06:14:57AM -0700, Andi Kleen wrote:
> > > > Which attribute parsing is failing for you?
> > > 
> > > The new .agg-per-core attribute I added later in the series.
> > > I think it will happen to any not-yet-known attribute.
> > 
> > alias can contain only terms defined in formats directory,
> > and the *.XXX attributes parsing does not return error code
> > 
> > can't see the failure, please get some example
> 
> Apply the kernel patch that adds several .agg-per-core attributes
> Then try to use any cpu/.../ event
> 
> % perf stat -e cpu/event=0x3c/ true
> invalid or unsupported event: 'cpu/event=0x3c/'
> 
> because the PMU parsing bailed out.

ugh right, the new attribute wont be recognized..

how about recognizing attribute based on the '.' prefix being
existing file rather than the suffix like in the attached patch

jirka


---
diff --git a/tools/perf/util/pmu.c b/tools/perf/util/pmu.c
index d4b0e6454bc6..937ecc35a60e 100644
--- a/tools/perf/util/pmu.c
+++ b/tools/perf/util/pmu.c
@@ -258,21 +258,23 @@ static int perf_pmu__new_alias(struct list_head *list, char *dir, char *name, FI
 	return __perf_pmu__new_alias(list, dir, name, NULL, buf);
 }
 
-static inline bool pmu_alias_info_file(char *name)
+static inline bool pmu_alias_attr_file(char *dir, char *name)
 {
-	size_t len;
-
-	len = strlen(name);
-	if (len > 5 && !strcmp(name + len - 5, ".unit"))
-		return true;
-	if (len > 6 && !strcmp(name + len - 6, ".scale"))
-		return true;
-	if (len > 8 && !strcmp(name + len - 8, ".per-pkg"))
-		return true;
-	if (len > 9 && !strcmp(name + len - 9, ".snapshot"))
-		return true;
+	bool ret = false;
+	struct stat st;
+	char *path, *s;
 
-	return false;
+	if (asprintf(&path, "%s/%s", dir, name) == -1)
+		return false;
+
+	s = strrchr(path, '.');
+	if (s) {
+		*s = 0;
+		ret = !stat(path, &st);
+	}
+
+	free(path);
+	return ret;
 }
 
 /*
@@ -300,7 +302,7 @@ static int pmu_aliases_parse(char *dir, struct list_head *head)
 		/*
 		 * skip info files parsed in perf_pmu__new_alias()
 		 */
-		if (pmu_alias_info_file(name))
+		if (pmu_alias_attr_file(dir, name))
 			continue;
 
 		snprintf(path, PATH_MAX, "%s/%s", dir, name);
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/