diff options
| -rw-r--r-- | block/blk-cgroup.c | 9 |
1 files changed, 9 insertions, 0 deletions
diff --git a/block/blk-cgroup.c b/block/blk-cgroup.c index d33dd6be1d9c..f9b55614d67d 100644 --- a/block/blk-cgroup.c +++ b/block/blk-cgroup.c @@ -119,6 +119,8 @@ static void blkg_async_bio_workfn(struct work_struct *work) async_bio_work); struct bio_list bios = BIO_EMPTY_LIST; struct bio *bio; + struct blk_plug plug; + bool need_plug = false; /* as long as there are pending bios, @blkg can't go away */ spin_lock_bh(&blkg->async_bio_lock); @@ -126,8 +128,15 @@ static void blkg_async_bio_workfn(struct work_struct *work) bio_list_init(&blkg->async_bios); spin_unlock_bh(&blkg->async_bio_lock); + /* start plug only when bio_list contains at least 2 bios */ + if (bios.head && bios.head->bi_next) { + need_plug = true; + blk_start_plug(&plug); + } while ((bio = bio_list_pop(&bios))) submit_bio(bio); + if (need_plug) + blk_finish_plug(&plug); } /** |