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From:   Ben Hutchings <ben@decadent.org.uk>
To:     linux-kernel@vger.kernel.org, stable@vger.kernel.org
CC:     akpm@linux-foundation.org,
        "Adrian Hunter" <adrian.hunter@intel.com>,
        "Wang Nan" <wangnan0@huawei.com>,
        "Namhyung Kim" <namhyung@kernel.org>,
        "Arnaldo Carvalho de Melo" <acme@redhat.com>,
        "David Ahern" <dsahern@gmail.com>, "Jiri Olsa" <jolsa@kernel.org>
Date:   Sun, 11 Nov 2018 19:49:05 +0000
Message-ID: <lsq.1541965745.423180005@decadent.org.uk>
Subject: [PATCH 3.16 364/366] perf trace: Do not process PERF_RECORD_LOST
 twice
In-Reply-To: <lsq.1541965744.387173642@decadent.org.uk>
Sender: linux-kernel-owner@vger.kernel.org
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3.16.61-rc1 review patch.  If anyone has any objections, please let me know.

------------------

From: Arnaldo Carvalho de Melo <acme@redhat.com>

commit 3ed5ca2efff70e9f589087c2013789572901112d upstream.

We catch this record to provide a visual indication that events are
getting lost, then call the default method to allow extra logging shared
with the other tools to take place.

This extra logging was done twice because we were continuing to the
"default" clause where machine__process_event() will end up calling
machine__process_lost_event() again, fix it.

Cc: Adrian Hunter <adrian.hunter@intel.com>
Cc: David Ahern <dsahern@gmail.com>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Wang Nan <wangnan0@huawei.com>
Link: http://lkml.kernel.org/n/tip-wus2zlhw3qo24ye84ewu4aqw@git.kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>
---
 tools/perf/builtin-trace.c | 1 +
 1 file changed, 1 insertion(+)

--- a/tools/perf/builtin-trace.c
+++ b/tools/perf/builtin-trace.c
@@ -1359,6 +1359,7 @@ static int trace__process_event(struct t
 		color_fprintf(trace->output, PERF_COLOR_RED,
 			      "LOST %" PRIu64 " events!\n", event->lost.lost);
 		ret = machine__process_lost_event(machine, event, sample);
+		break;
 	default:
 		ret = machine__process_event(machine, event, sample);
 		break;