[PATCH] Adding an error message to indicate perf_event cgroupsubsys not mounted.

[Will Auld]

Adding an error message to indicate that there is no mounted perf_event
cgroup while using -G or --cgroup options with perf.

Signed-off-by: Will Auld <will.auld@xxxxxxxxx>
---
 tools/perf/util/cgroup.c |    4 +++-
 1 files changed, 3 insertions(+), 1 deletions(-)

diff --git a/tools/perf/util/cgroup.c b/tools/perf/util/cgroup.c
index 96bbda1..4126beb 100644
--- a/tools/perf/util/cgroup.c
+++ b/tools/perf/util/cgroup.c
@@ -44,8 +44,10 @@ cgroupfs_find_mountpoint(char *buf, size_t maxlen)
 			break;
 	}
 	fclose(fp);
-	if (!found)
+	if (!found) {
+		error("No cgroup mounted with \'perf_event\' type");
 		return -1;
+	}
 
 	if (strlen(mountpoint) < maxlen) {
 		strcpy(buf, mountpoint);
-- 
1.7.1



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