linux-kernel - [tip:perf/urgent] perf probe: Add '--demangle'/'--no-demangle'

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Message-ID: <tip-35e17b2450e09968f9702d4048c228199af171bc@git.kernel.org>
Date:	Thu, 14 Nov 2013 23:25:45 -0800
From:	tip-bot for Azat Khuzhin <tipbot@...or.com>
To:	linux-tip-commits@...r.kernel.org
Cc:	acme@...hat.com, linux-kernel@...r.kernel.org, paulus@...ba.org,
	mingo@...hat.com, hpa@...or.com, mingo@...nel.org,
	a.p.zijlstra@...llo.nl, a3at.mail@...il.com, tglx@...utronix.de
Subject: [tip:perf/urgent] perf probe: Add '--demangle'/'--no-demangle'

Commit-ID:  35e17b2450e09968f9702d4048c228199af171bc
Gitweb:     http://git.kernel.org/tip/35e17b2450e09968f9702d4048c228199af171bc
Author:     Azat Khuzhin <a3at.mail@...il.com>
AuthorDate: Mon, 28 Oct 2013 12:04:24 +0400
Committer:  Arnaldo Carvalho de Melo <acme@...hat.com>
CommitDate: Thu, 14 Nov 2013 16:06:28 -0300

perf probe: Add '--demangle'/'--no-demangle'

You can't pass demangled name into "perf probe", because of special chars:
./perf probe -f -x /tmp/a.out 'foo(int)'
Semantic error :There is non-digit char in line number.

And you can't even pass without demangling (because it search symbol in
DSO with demangle=true):
./perf probe -f -x /tmp/a.out _Z3fooi
no symbols found in /tmp/a.out, maybe install a debug package?

However:
nm /tmp/a.out | grep foo
000000000040056d T _Z3fooi

After this patch, using the next command:
./perf probe -f --no-demangle -x /tmp/a.out _Z3fooi

probe will be successfully added.

Signed-off-by: Azat Khuzhin <a3at.mail@...il.com>
Cc: Ingo Molnar <mingo@...hat.com>
Cc: Paul Mackerras <paulus@...ba.org>
Cc: Peter Zijlstra <a.p.zijlstra@...llo.nl>
Link: http://lkml.kernel.org/r/1382947464-31266-1-git-send-email-a3at.mail@gmail.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@...hat.com>
---
 tools/perf/builtin-probe.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/tools/perf/builtin-probe.c b/tools/perf/builtin-probe.c
index 89acc17..6ea9e85 100644
--- a/tools/perf/builtin-probe.c
+++ b/tools/perf/builtin-probe.c
@@ -325,6 +325,8 @@ int cmd_probe(int argc, const char **argv, const char *prefix __maybe_unused)
 		     opt_set_filter),
 	OPT_CALLBACK('x', "exec", NULL, "executable|path",
 			"target executable name or path", opt_set_target),
+	OPT_BOOLEAN(0, "demangle", &symbol_conf.demangle,
+		    "Disable symbol demangling"),
 	OPT_END()
 	};
 	int ret;
--
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