aboutsummaryrefslogtreecommitdiff
path: root/block
diff options
context:
space:
mode:
authorJens Axboe <axboe@fb.com>2016-12-09 13:08:35 -0700
committerJens Axboe <axboe@fb.com>2016-12-09 13:08:35 -0700
commit7cd54aa8438947602cf68eda1db327822b9b8e6b (patch)
tree42c0d2935f29a7644425146bd2ea08f436d70e8e /block
parentc8e52ba5e2d6df5acaaeedda20d74f4ec3adcc82 (diff)
downloadlinux-stericsson-7cd54aa8438947602cf68eda1db327822b9b8e6b.tar.gz
blk-stat: fix a few cases of missing batch flushing
Everytime we need to read ->nr_samples, we should have flushed the batch first. The non-mq read path also needs to flush the batch. Signed-off-by: Jens Axboe <axboe@fb.com>
Diffstat (limited to 'block')
-rw-r--r--block/blk-stat.c8
1 files changed, 8 insertions, 0 deletions
diff --git a/block/blk-stat.c b/block/blk-stat.c
index 4d0118568727..9b43efb8933f 100644
--- a/block/blk-stat.c
+++ b/block/blk-stat.c
@@ -64,6 +64,9 @@ static void blk_mq_stat_get(struct request_queue *q, struct blk_rq_stat *dst)
queue_for_each_hw_ctx(q, hctx, i) {
hctx_for_each_ctx(hctx, ctx, j) {
+ blk_stat_flush_batch(&ctx->stat[BLK_STAT_READ]);
+ blk_stat_flush_batch(&ctx->stat[BLK_STAT_WRITE]);
+
if (!ctx->stat[BLK_STAT_READ].nr_samples &&
!ctx->stat[BLK_STAT_WRITE].nr_samples)
continue;
@@ -111,6 +114,8 @@ void blk_queue_stat_get(struct request_queue *q, struct blk_rq_stat *dst)
if (q->mq_ops)
blk_mq_stat_get(q, dst);
else {
+ blk_stat_flush_batch(&q->rq_stats[BLK_STAT_READ]);
+ blk_stat_flush_batch(&q->rq_stats[BLK_STAT_WRITE]);
memcpy(&dst[BLK_STAT_READ], &q->rq_stats[BLK_STAT_READ],
sizeof(struct blk_rq_stat));
memcpy(&dst[BLK_STAT_WRITE], &q->rq_stats[BLK_STAT_WRITE],
@@ -128,6 +133,9 @@ void blk_hctx_stat_get(struct blk_mq_hw_ctx *hctx, struct blk_rq_stat *dst)
uint64_t newest = 0;
hctx_for_each_ctx(hctx, ctx, i) {
+ blk_stat_flush_batch(&ctx->stat[BLK_STAT_READ]);
+ blk_stat_flush_batch(&ctx->stat[BLK_STAT_WRITE]);
+
if (!ctx->stat[BLK_STAT_READ].nr_samples &&
!ctx->stat[BLK_STAT_WRITE].nr_samples)
continue;