linux-kernel - [tip:perf/core] perf top: Fix unresolved comm when -s comm is used

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Message-ID: <tip-4b37af595742977f1bdd8c0fd0f3e6e55b36e7b7@git.kernel.org>
Date:	Sat, 3 Oct 2015 00:48:59 -0700
From:	tip-bot for Namhyung Kim <tipbot@...or.com>
To:	linux-tip-commits@...r.kernel.org
Cc:	hpa@...or.com, mingo@...nel.org, namhyung@...nel.org,
	a.p.zijlstra@...llo.nl, acme@...hat.com, jolsa@...hat.com,
	linux-kernel@...r.kernel.org, dsahern@...il.com, tglx@...utronix.de
Subject: [tip:perf/core] perf top:
  Fix unresolved comm when -s comm is used

Commit-ID:  4b37af595742977f1bdd8c0fd0f3e6e55b36e7b7
Gitweb:     http://git.kernel.org/tip/4b37af595742977f1bdd8c0fd0f3e6e55b36e7b7
Author:     Namhyung Kim <namhyung@...nel.org>
AuthorDate: Wed, 30 Sep 2015 10:45:25 +0900
Committer:  Arnaldo Carvalho de Melo <acme@...hat.com>
CommitDate: Thu, 1 Oct 2015 09:54:33 -0300

perf top: Fix unresolved comm when -s comm is used

The perf top uses 'dso,symbol' sort keys by default so it overlooked a
problem in task's comm resolving.  When the sort key contains 'comm',
some task's comm is not shown properly.  This is because the
perf_top__mmap_read_idx() checks the cpumode value improperly.

The cpumode value of non-sample events are 0 (PERF_RECORD_MISC_CPUMODE_
UNKNOWN) so the events will be ignored by the switch statement.  This patch
allows it for non-sample events.

Signed-off-by: Namhyung Kim <namhyung@...nel.org>
Cc: David Ahern <dsahern@...il.com>
Cc: Jiri Olsa <jolsa@...hat.com>
Cc: Peter Zijlstra <a.p.zijlstra@...llo.nl>
Link: http://lkml.kernel.org/r/1443577526-3240-2-git-send-email-namhyung@kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@...hat.com>
---
 tools/perf/builtin-top.c | 7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

diff --git a/tools/perf/builtin-top.c b/tools/perf/builtin-top.c
index 38d4d6c..ae4c642 100644
--- a/tools/perf/builtin-top.c
+++ b/tools/perf/builtin-top.c
@@ -857,9 +857,12 @@ static void perf_top__mmap_read_idx(struct perf_top *top, int idx)
 			 * TODO: we don't process guest user from host side
 			 * except simple counting.
 			 */
-			/* Fall thru */
-		default:
 			goto next_event;
+		default:
+			if (event->header.type == PERF_RECORD_SAMPLE)
+				goto next_event;
+			machine = &session->machines.host;
+			break;
 		}
 
 
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