From 59fa0224cfea31dde596e29555de94c961b139f9 Mon Sep 17 00:00:00 2001 From: Shaohua Li Date: Mon, 9 May 2016 17:22:15 -0700 Subject: blk-throttle: don't parse cgroup path if trace isn't enabled if trace isn't enabled, parsing cgroup path just wastes cpu Signed-off-by: Shaohua Li Signed-off-by: Jens Axboe --- block/blk-throttle.c | 5 ++--- 1 file changed, 2 insertions(+), 3 deletions(-) (limited to 'block') diff --git a/block/blk-throttle.c b/block/blk-throttle.c index 2149a1ddbacf..47a3e540631a 100644 --- a/block/blk-throttle.c +++ b/block/blk-throttle.c @@ -211,15 +211,14 @@ static struct throtl_data *sq_to_td(struct throtl_service_queue *sq) * * The messages are prefixed with "throtl BLKG_NAME" if @sq belongs to a * throtl_grp; otherwise, just "throtl". - * - * TODO: this should be made a function and name formatting should happen - * after testing whether blktrace is enabled. */ #define throtl_log(sq, fmt, args...) do { \ struct throtl_grp *__tg = sq_to_tg((sq)); \ struct throtl_data *__td = sq_to_td((sq)); \ \ (void)__td; \ + if (likely(!blk_trace_note_message_enabled(__td->queue))) \ + break; \ if ((__tg)) { \ char __pbuf[128]; \ \ -- cgit v1.2.3-59-g8ed1b