In submit_bio, we count vm events by check READ/WRITE.
But actually DISCARD_NOBARRIER also has the WRITE flag set.
It looks as if in blkdev_issue_discard, we also add a
page as the payload and the bio_has_data check isn't enough.
So add another check for discard bio.
Cc: Jens Axboe <axboe@xxxxxxxxx>
Signed-off-by: Tao Ma <tao.ma@xxxxxxxxxx>
---
block/blk-core.c | 2 +-
1 files changed, 1 insertions(+), 1 deletions(-)
diff --git a/block/blk-core.c b/block/blk-core.c
index f84cce4..a725602 100644
--- a/block/blk-core.c
+++ b/block/blk-core.c
@@ -1586,7 +1586,7 @@ void submit_bio(int rw, struct bio *bio)
* If it's a regular read/write or a barrier with data attached,
* go through the normal accounting stuff before submission.
*/
- if (bio_has_data(bio)) {
+ if (bio_has_data(bio) && !(rw & BIO_RW_DISCARD)) {
if (rw & WRITE) {
count_vm_events(PGPGOUT, count);
} else {
--
1.5.5
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