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authorNamhyung Kim <namhyung@kernel.org>2015-12-11 11:56:54 +0900
committerArnaldo Carvalho de Melo <acme@redhat.com>2015-12-11 08:34:49 -0300
commit151ee834cc946fa159ee406c62b4d5ce1ebd7115 (patch)
tree6fb57dae8b814f4553b62936eccb3edda8468248 /tools/perf/builtin-top.c
parent64226bcf64629996948dc03c38594f00511bfc2b (diff)
perf top: Access hists->lock only if needed
The perf_top__record_precise_ip() releases and regrabs the he->hists->lock because it can sleep if there's an error. But it should be done conditionally as it slows down the fast path. Signed-off-by: Namhyung Kim <namhyung@kernel.org> Cc: David Ahern <dsahern@gmail.com> Cc: Jiri Olsa <jolsa@redhat.com> Cc: Peter Zijlstra <a.p.zijlstra@chello.nl> Link: http://lkml.kernel.org/r/1449802616-16170-2-git-send-email-namhyung@kernel.org Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Diffstat (limited to 'tools/perf/builtin-top.c')
-rw-r--r--tools/perf/builtin-top.c28
1 files changed, 15 insertions, 13 deletions
diff --git a/tools/perf/builtin-top.c b/tools/perf/builtin-top.c
index 3b0978e5578a..586798acf7db 100644
--- a/tools/perf/builtin-top.c
+++ b/tools/perf/builtin-top.c
@@ -194,21 +194,23 @@ static void perf_top__record_precise_ip(struct perf_top *top,
pthread_mutex_unlock(&notes->lock);
- /*
- * This function is now called with he->hists->lock held.
- * Release it before going to sleep.
- */
- pthread_mutex_unlock(&he->hists->lock);
+ if (unlikely(err)) {
+ /*
+ * This function is now called with he->hists->lock held.
+ * Release it before going to sleep.
+ */
+ pthread_mutex_unlock(&he->hists->lock);
+
+ if (err == -ERANGE && !he->ms.map->erange_warned)
+ ui__warn_map_erange(he->ms.map, sym, ip);
+ else if (err == -ENOMEM) {
+ pr_err("Not enough memory for annotating '%s' symbol!\n",
+ sym->name);
+ sleep(1);
+ }
- if (err == -ERANGE && !he->ms.map->erange_warned)
- ui__warn_map_erange(he->ms.map, sym, ip);
- else if (err == -ENOMEM) {
- pr_err("Not enough memory for annotating '%s' symbol!\n",
- sym->name);
- sleep(1);
+ pthread_mutex_lock(&he->hists->lock);
}
-
- pthread_mutex_lock(&he->hists->lock);
}
static void perf_top__show_details(struct perf_top *top)