linux-kernel - [PATCH] perf tools: Adjust symbols in VDSO

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Message-ID: <web-7508803@mx2.tbricks.com>
Date:	Fri, 11 Apr 2014 18:25:27 +0400
From:	"Vladimir Nikulichev" <nvs@...icks.com>
To:	Jiri Olsa <jolsa@...hat.com>
Cc:	Namhyung Kim <namhyung@...nel.org>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Paul Mackerras <paulus@...ba.org>,
	Ingo Molnar <mingo@...hat.com>,
	Arnaldo Carvalho de Melo <acme@...nel.org>,
	"linux-perf-users@...r.kernel.org" <linux-perf-users@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: [PATCH] perf tools: Adjust symbols in VDSO

perf tools: Adjust symbols in VDSO

pert-report doesn't resolve function names in VDSO:

$ perf report --stdio -g flat,0.0,15,callee --sort pid
...
             8.76%
                0x7fff6b1fe861
                __gettimeofday
                ACE_OS::gettimeofday()
...

In this case symbol values should be adjusted the same way as for 
executables,
relocatable objects and prelinked libraries.

After fix:

$ perf report --stdio -g flat,0.0,15,callee --sort pid
...
             8.76%
                __vdso_gettimeofday
                __gettimeofday
                ACE_OS::gettimeofday()

Signed-off-by: Vladimir Nikulichev <nvs@...icks.com>

diff --git a/tools/perf/util/symbol-elf.c 
b/tools/perf/util/symbol-elf.c
index 3b7dbf5..6864661 100644
--- a/tools/perf/util/symbol-elf.c
+++ b/tools/perf/util/symbol-elf.c
@@ -6,6 +6,7 @@
#include <inttypes.h>

#include "symbol.h"
+#include "vdso.h"
#include <symbol/kallsyms.h>
#include "debug.h"

@@ -618,6 +619,7 @@ int symsrc__init(struct symsrc *ss, struct dso 
*dso, const char *name,
		GElf_Shdr shdr;
		ss->adjust_symbols = (ehdr.e_type == ET_EXEC ||
				ehdr.e_type == ET_REL ||
+				is_vdso_map(dso->short_name) ||
				elf_section_by_name(elf, &ehdr, &shdr,
						     ".gnu.prelink_undo",
						     NULL) != NULL);
--
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