linux-kernel - [PATCH v2 2/4] perf tests: make objdump disassemble zero blocks

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Date:	Wed,  2 Sep 2015 10:19:15 +0200
From:	Jan Stancek <jstancek@...hat.com>
To:	linux-kernel@...r.kernel.org
Cc:	acme@...nel.org, jolsa@...nel.org, adrian.hunter@...el.com,
	dsahern@...il.com, cjashfor@...ux.vnet.ibm.com, fweisbec@...il.com,
	mingo@...nel.org, namhyung@...nel.org, paulus@...ba.org,
	a.p.zijlstra@...llo.nl, jstancek@...hat.com
Subject: [PATCH v2 2/4] perf tests: make objdump disassemble zero blocks

Add -z parameter to avoid skipping zero blocks:

 ffffffff816704fe <sysret_check+0x4b>:
 ffffffff816704fe:  7b 34         jnp ffffffff81670534 <sysret_signal+0x1c>
       ...
 ffffffff81670501 <sysret_careful>:
 ffffffff81670501:  0f ba e2 03   bt  $0x3,%edx
 ffffffff81670505:  73 11         jae ffffffff81670518 <sysret_signal>

Signed-off-by: Jan Stancek <jstancek@...hat.com>
Cc: Arnaldo Carvalho de Melo <acme@...nel.org>
Cc: Jiri Olsa <jolsa@...nel.org>
Cc: Adrian Hunter <adrian.hunter@...el.com>
Cc: David Ahern <dsahern@...il.com>
Cc: Corey Ashford <cjashfor@...ux.vnet.ibm.com>
Cc: Frederic Weisbecker <fweisbec@...il.com>
Cc: Ingo Molnar <mingo@...nel.org>
Cc: Namhyung Kim <namhyung@...nel.org>
Cc: Paul Mackerras <paulus@...ba.org>
Cc: Peter Zijlstra <a.p.zijlstra@...llo.nl>
---
 tools/perf/tests/code-reading.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/tools/perf/tests/code-reading.c b/tools/perf/tests/code-reading.c
index 38ee90bc2228..375ba30e4ed0 100644
--- a/tools/perf/tests/code-reading.c
+++ b/tools/perf/tests/code-reading.c
@@ -128,7 +128,8 @@ static int read_via_objdump(const char *filename, u64 addr, void *buf,
 	FILE *f;
 	int ret;
 
-	fmt = "%s -d --start-address=0x%"PRIx64" --stop-address=0x%"PRIx64" %s";
+	fmt = "%s -z -d --start-address=0x%"PRIx64\
+		" --stop-address=0x%"PRIx64" %s";
 	ret = snprintf(cmd, sizeof(cmd), fmt, "objdump", addr, addr + len,
 		       filename);
 	if (ret <= 0 || (size_t)ret >= sizeof(cmd))
-- 
1.8.3.1

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