linux-kernel - [PATCH] perf tools: Fix reading of perf.data file header

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Date:	Thu, 06 Aug 2009 20:57:41 +0200
From:	Peter Zijlstra <a.p.zijlstra@...llo.nl>
To:	Brice Goglin <Brice.Goglin@...ia.fr>
Cc:	Ingo Molnar <mingo@...e.hu>, paulus@...ba.org,
	LKML <linux-kernel@...r.kernel.org>
Subject: [PATCH] perf tools: Fix reading of perf.data file header

On Thu, 2009-08-06 at 19:48 +0200, Brice Goglin wrote:
> Peter Zijlstra wrote:
> > On Thu, 2009-08-06 at 18:59 +0200, Brice Goglin wrote:
> >
> >   
> >> I can easily sort them by thread id, but I don't know how to match my 4
> >> events with each group of 4 line.
> >>
> >> Maybe perf report earned some better way to show per-thread statistics
> >> in the meantime?
> >>     
> >
> > Nah, it needs some love..
> >
> > The below might be a starting point, it compiles, didn't check the
> > result. builtin-stat might be a nice place to look for more bits..
> >   
> 
> Thanks, now I get for each thread:
> 
> 0x8fc0 [0x30]: PERF_EVENT_READ: 6268 6268 FAIL 209113
> 0x9698 [0x30]: PERF_EVENT_READ: 6268 6268 FAIL 307215
> 0x9cf8 [0x30]: PERF_EVENT_READ: 6268 6268 FAIL 9203221
> 0x8bb8 [0x30]: PERF_EVENT_READ: 6268 6268 raw 0x1000001e0 494628
> 
> Looks like it fails to stringified my raw events except the first one.

---
Subject: perf tools: Fix reading of perf.data file header

A silly mistake made us re-read the first attribute for every attribute.

Signed-off-by: Peter Zijlstra <a.p.zijlstra@...llo.nl>
---
diff --git a/tools/perf/util/header.c b/tools/perf/util/header.c
index 450384b..95a44bc 100644
--- a/tools/perf/util/header.c
+++ b/tools/perf/util/header.c
@@ -213,9 +213,10 @@ struct perf_header *perf_header__read(int fd)
 
 	for (i = 0; i < nr_attrs; i++) {
 		struct perf_header_attr *attr;
-		off_t tmp = lseek(fd, 0, SEEK_CUR);
+		off_t tmp;
 
 		do_read(fd, &f_attr, sizeof(f_attr));
+		tmp = lseek(fd, 0, SEEK_CUR);
 
 		attr = perf_header_attr__new(&f_attr.attr);
 


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