---

yaml --- r: 277355 b: refs/heads/master c: 18e6093 h: refs/heads/master i: 277353: 0a1762b 277351: fc9dc04 v: v3
git-mirror · Dec 23, 2011 · a08f2dd · a08f2dd
1 parent 8246163
commit a08f2dd
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Showing 2 changed files with 9 additions and 2 deletions.
diff --git a/[refs] b/[refs]
@@ -1,2 +1,2 @@
 ---
-refs/heads/master: f41612f43be9575e1160460b08c3a760e6e27e1b
+refs/heads/master: 18e6093904abfd51671ff5846c2fdaba9ebbf21b
diff --git a/trunk/tools/perf/builtin-record.c b/trunk/tools/perf/builtin-record.c
@@ -272,8 +272,15 @@ static void perf_record__open(struct perf_record *rec)
 		exit(-1);
 	}
 
-	if (perf_evlist__mmap(evlist, opts->mmap_pages, false) < 0)
+	if (perf_evlist__mmap(evlist, opts->mmap_pages, false) < 0) {
+		if (errno == EPERM)
+			die("Permission error mapping pages.\n"
+			    "Consider increasing "
+			    "/proc/sys/kernel/perf_event_mlock_kb,\n"
+			    "or try again with a smaller value of -m/--mmap_pages.\n"
+			    "(current value: %d)\n", opts->mmap_pages);
 		die("failed to mmap with %d (%s)\n", errno, strerror(errno));
+	}
 
 	if (rec->file_new)
 		session->evlist = evlist;