linux-kernel - [tip:perf/core] perf evlist: Add a debug print if event buffer mmap fails

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Message-ID: <tip-026359658aecd348bc5c4a136a26f204b169103b@git.kernel.org>
Date:	Mon, 4 Nov 2013 12:20:52 -0800
From:	tip-bot for Adrian Hunter <tipbot@...or.com>
To:	linux-tip-commits@...r.kernel.org
Cc:	acme@...hat.com, linux-kernel@...r.kernel.org, eranian@...gle.com,
	paulus@...ba.org, mingo@...hat.com, hpa@...or.com,
	mingo@...nel.org, a.p.zijlstra@...llo.nl, efault@....de,
	namhyung@...il.com, jolsa@...hat.com, fweisbec@...il.com,
	adrian.hunter@...el.com, dsahern@...il.com, tglx@...utronix.de
Subject: [tip:perf/core] perf evlist:
  Add a debug print if event buffer mmap fails

Commit-ID:  026359658aecd348bc5c4a136a26f204b169103b
Gitweb:     http://git.kernel.org/tip/026359658aecd348bc5c4a136a26f204b169103b
Author:     Adrian Hunter <adrian.hunter@...el.com>
AuthorDate: Fri, 1 Nov 2013 15:51:33 +0200
Committer:  Arnaldo Carvalho de Melo <acme@...hat.com>
CommitDate: Mon, 4 Nov 2013 12:21:41 -0300

perf evlist: Add a debug print if event buffer mmap fails

Add a debug print if mmap of the perf event ring buffer fails.

Signed-off-by: Adrian Hunter <adrian.hunter@...el.com>
Cc: David Ahern <dsahern@...il.com>
Cc: Frederic Weisbecker <fweisbec@...il.com>
Cc: Ingo Molnar <mingo@...hat.com>
Cc: Jiri Olsa <jolsa@...hat.com>
Cc: Mike Galbraith <efault@....de>
Cc: Namhyung Kim <namhyung@...il.com>
Cc: Paul Mackerras <paulus@...ba.org>
Cc: Peter Zijlstra <a.p.zijlstra@...llo.nl>
Cc: Stephane Eranian <eranian@...gle.com>
Link: http://lkml.kernel.org/r/1383313899-15987-6-git-send-email-adrian.hunter@intel.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@...hat.com>
---
 tools/perf/util/evlist.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/tools/perf/util/evlist.c b/tools/perf/util/evlist.c
index 0582f67..1c173cc 100644
--- a/tools/perf/util/evlist.c
+++ b/tools/perf/util/evlist.c
@@ -607,6 +607,8 @@ static int __perf_evlist__mmap(struct perf_evlist *evlist,
 	evlist->mmap[idx].base = mmap(NULL, evlist->mmap_len, prot,
 				      MAP_SHARED, fd, 0);
 	if (evlist->mmap[idx].base == MAP_FAILED) {
+		pr_debug2("failed to mmap perf event ring buffer, error %d\n",
+			  errno);
 		evlist->mmap[idx].base = NULL;
 		return -1;
 	}
--
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