perf record: Synthesize cgroup events only if needed

[uclinux-h8/linux.git] / tools / perf / util / synthetic-events.c

diff --git a/tools/perf/util/synthetic-events.c b/tools/perf/util/synthetic-events.c
index 8a23391..d9c6243 100644 (file)
--- a/tools/perf/util/synthetic-events.c
+++ b/tools/perf/util/synthetic-events.c
@@ -563,6 +563,9 @@ int perf_event__synthesize_cgroups(struct perf_tool *tool,
        char cgrp_root[PATH_MAX];
        size_t mount_len;  /* length of mount point in the path */
 
+       if (!tool || !tool->cgroup_events)
+               return 0;
+
        if (cgroupfs_find_mountpoint(cgrp_root, PATH_MAX, "perf_event") < 0) {
                pr_debug("cannot find cgroup mount point\n");
                return -1;