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blk-stat: fix blk_stat_sum() if all samples are batched

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We need to flush the batch _before_ we check the number of samples,
otherwise we'll miss all of the batched samples.

Fixes: cf43e6b ("block: add scalable completion tracking of requests")
Signed-off-by: Omar Sandoval <osandov@fb.com>
Signed-off-by: Jens Axboe <axboe@fb.com>
This commit is contained in:
Omar Sandoval 2017-03-16 09:46:14 -06:00 • committed by Jens Axboe
parent 69eea5a4ab
commit efd4b81abb
1 changed files with 2 additions and 2 deletions
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4
block/blk-stat.c
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@ -30,11 +30,11 @@ static void blk_stat_flush_batch(struct blk_rq_stat *stat)
static void blk_stat_sum(struct blk_rq_stat *dst, struct blk_rq_stat *src) static void blk_stat_sum(struct blk_rq_stat *dst, struct blk_rq_stat *src)
{ {
blk_stat_flush_batch(src);
if (!src->nr_samples) if (!src->nr_samples)
return; return;
blk_stat_flush_batch(src);
dst->min = min(dst->min, src->min); dst->min = min(dst->min, src->min);
dst->max = max(dst->max, src->max); dst->max = max(dst->max, src->max);