linux-kernel - [tip:perf/core] perf symbols: Filter samples with unresolved symbol when "--symbols" option is used

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Message-ID: <tip-1500b93b61fc70a1176871b64f1c8ae3bd4da9dd@git.kernel.org>
Date:	Wed, 19 Sep 2012 08:21:21 -0700
From:	tip-bot for Feng Tang <feng.tang@...el.com>
To:	linux-tip-commits@...r.kernel.org
Cc:	acme@...hat.com, linux-kernel@...r.kernel.org, hpa@...or.com,
	mingo@...nel.org, andi@...stfloor.org, a.p.zijlstra@...llo.nl,
	namhyung@...nel.org, dsahern@...il.com, tglx@...utronix.de,
	feng.tang@...el.com, mingo@...e.hu
Subject: [tip:perf/core] perf symbols:
  Filter samples with unresolved symbol when "--symbols" option is used

Commit-ID:  1500b93b61fc70a1176871b64f1c8ae3bd4da9dd
Gitweb:     http://git.kernel.org/tip/1500b93b61fc70a1176871b64f1c8ae3bd4da9dd
Author:     Feng Tang <feng.tang@...el.com>
AuthorDate: Fri, 7 Sep 2012 16:42:23 +0800
Committer:  Arnaldo Carvalho de Melo <acme@...hat.com>
CommitDate: Mon, 17 Sep 2012 13:10:57 -0300

perf symbols: Filter samples with unresolved symbol when "--symbols" option is used

Report/top commands support to only handle specific symbols with
"--symbols" option, but current code will keep those samples whose
symbol can't be resolved, which should actually be filtered.

If we run following commands:
$perf record -a tree
$perf report --symbols intel_idle -n
the output will be:

Without the patch:
==================
    46.27%        156     sshd  [unknown]
    26.05%         48  swapper  [kernel.kallsyms]
    17.26%         38     tree  libc-2.12.1.so
     7.69%         17     tree  tree
     2.73%          6     tree  ld-2.12.1.so

With the patch:
===============
   100.00%         48  swapper  [kernel.kallsyms]

Signed-off-by: Feng Tang <feng.tang@...el.com>
Cc: Andi Kleen <andi@...stfloor.org>
Cc: David Ahern <dsahern@...il.com>
Cc: Ingo Molnar <mingo@...e.hu>
Cc: Namhyung Kim <namhyung@...nel.org>
Cc: Peter Zijlstra <a.p.zijlstra@...llo.nl>
Link: http://lkml.kernel.org/r/1347007349-3102-2-git-send-email-feng.tang@intel.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@...hat.com>
---
 tools/perf/util/event.c |    5 +++--
 1 files changed, 3 insertions(+), 2 deletions(-)

diff --git a/tools/perf/util/event.c b/tools/perf/util/event.c
index 8202f5c..6715b19 100644
--- a/tools/perf/util/event.c
+++ b/tools/perf/util/event.c
@@ -904,8 +904,9 @@ int perf_event__preprocess_sample(const union perf_event *event,
 		al->sym = map__find_symbol(al->map, al->addr, filter);
 	}
 
-	if (symbol_conf.sym_list && al->sym &&
-	    !strlist__has_entry(symbol_conf.sym_list, al->sym->name))
+	if (symbol_conf.sym_list &&
+		(!al->sym || !strlist__has_entry(symbol_conf.sym_list,
+						al->sym->name)))
 		goto out_filtered;
 
 	return 0;
--
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