linux-kernel - Re: [GIT PULL] perf fixes

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Date:	Mon, 28 Oct 2013 10:34:30 +0100
From:	Markus Trippelsdorf <markus@...ppelsdorf.de>
To:	Ingo Molnar <mingo@...nel.org>
Cc:	Linus Torvalds <torvalds@...ux-foundation.org>,
	linux-kernel@...r.kernel.org,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Arnaldo Carvalho de Melo <acme@...radead.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Stephane Eranian <eranian@...gle.com>
Subject: Re: [GIT PULL] perf fixes

On 2013.10.28 at 10:02 +0100, ------------------------------ Markus Trippelsdorf wrote:
> On 2013.10.28 at 09:28 +0100, Markus Trippelsdorf wrote:
> > On 2013.10.26 at 14:24 +0200, Ingo Molnar wrote:
> > >  - Reversal of the new 'MMAP2' extended mmap record ABI, introduced 
> > >    in this merge window. (Patches were proposed to fix it but it was
> > >    all a bit late and we felt it's safer to just delay the ABI one
> > >    more kernel release and do it right.)
> > 
> > commit 3090ffb5a2515990182f3f55b0688a7817325488
> > Author: Stephane Eranian <eranian@...gle.com>
> > Date:   Thu Oct 17 19:32:15 2013 +0200
> > 
> >     perf: Disable PERF_RECORD_MMAP2 support
> > 
> > The commit above breaks "perf top" on my system, because it causes only
> > [kernel] symbols to show up in the list. When I revert the commit I get
> > the usual mixture of userspace and kernel symbols in the list.

The following patch fixes the issue:

diff --git a/tools/perf/util/event.c b/tools/perf/util/event.c
index 63df031fc9c7..811f3950654d 100644
--- a/tools/perf/util/event.c
+++ b/tools/perf/util/event.c
@@ -199,7 +199,6 @@ static int perf_event__synthesize_mmap_events(struct perf_tool *tool,
 		char execname[PATH_MAX];
 		char anonstr[] = "//anon";
 		size_t size;
-		ssize_t n;
 
 		if (fgets(bf, sizeof(bf), fp) == NULL)
 			break;
@@ -208,14 +207,11 @@ static int perf_event__synthesize_mmap_events(struct perf_tool *tool,
 		strcpy(execname, "");
 
 		/* 00400000-0040c000 r-xp 00000000 fd:01 41038  /bin/cat */
-		n = sscanf(bf, "%"PRIx64"-%"PRIx64" %s %"PRIx64" %*x:%*x %*u %s\n",
+		sscanf(bf, "%"PRIx64"-%"PRIx64" %s %"PRIx64" %*x:%*x %*u %s\n",
 		       &event->mmap.start, &event->mmap.len, prot,
 		       &event->mmap.pgoff,
 		       execname);
 
-		if (n != 8)
-			continue;
-
 		if (prot[2] != 'x')
 			continue;
 
-- 
Markus
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