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| author | Shaohua Li <shli@fb.com> | 2016-05-09 17:22:15 -0700 |
|---|---|---|
| committer | Jens Axboe <axboe@fb.com> | 2016-05-10 08:41:37 -0600 |
| commit | 59fa0224cfea31dde596e29555de94c961b139f9 (patch) | |
| tree | 4d0812a3b897bc9f1ad1ca45bd156141b5c8b946 /block | |
| parent | 8d1547e08dda8848f01185b3fd6bb946b68de99f (diff) | |
| download | linux-stable-59fa0224cfea31dde596e29555de94c961b139f9.tar.gz linux-stable-59fa0224cfea31dde596e29555de94c961b139f9.tar.bz2 linux-stable-59fa0224cfea31dde596e29555de94c961b139f9.zip | |
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 <shli@fb.com>
Signed-off-by: Jens Axboe <axboe@fb.com>
Diffstat (limited to 'block')
| -rw-r--r-- | block/blk-throttle.c | 5 |
1 files changed, 2 insertions, 3 deletions
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]; \ \ |