linux-kernel - [PATCH] perf symbols: Fill in pgoff in mmap synthesized events

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Date:	Sat, 3 Apr 2010 22:53:31 +1100
From:	Anton Blanchard <anton@...ba.org>
To:	David Miller <davem@...emloft.net>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Paul Mackerras <paulus@...ba.org>, Ingo Molnar <mingo@...e.hu>,
	Arnaldo Carvalho de Melo <acme@...hat.com>
Cc:	linux-kernel@...r.kernel.org
Subject: [PATCH] perf symbols: Fill in pgoff in mmap synthesized events


When we synthesize mmap events we need to fill in the pgoff field. 

Signed-off-by: Anton Blanchard <anton@...ba.org>
---

I wasn't able to test this completely since I couldn't find an executable
region with a non 0 offset. We will see it when we start doing data
profiling.

Index: linux.trees.git/tools/perf/util/event.c
===================================================================
--- linux.trees.git.orig/tools/perf/util/event.c	2010-04-01 07:55:13.000000000 +1100
+++ linux.trees.git/tools/perf/util/event.c	2010-04-03 22:45:02.000000000 +1100
@@ -130,6 +130,7 @@ static int event__synthesize_mmap_events
 			continue;
 		pbf += n + 3;
 		if (*pbf == 'x') { /* vm_exec */
+			u64 vm_pgoff;
 			char *execname = strchr(bf, '/');
 
 			/* Catch VDSO */
@@ -139,6 +140,14 @@ static int event__synthesize_mmap_events
 			if (execname == NULL)
 				continue;
 
+			pbf += 3;
+			n = hex2u64(pbf, &vm_pgoff);
+			/* pgoff is in bytes, not pages */
+			if (n >= 0)
+				ev.mmap.pgoff = vm_pgoff << getpagesize();
+			else
+				ev.mmap.pgoff = 0;
+
 			size = strlen(execname);
 			execname[size - 1] = '\0'; /* Remove \n */
 			memcpy(ev.mmap.filename, execname, size);
--
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