[PATCH] blkcg: add plugging support for punt bio
From: Xianting Tian <hidden>
Date: 2020-08-06 17:06:49
Also in:
cgroups, lkml
Subsystem:
block layer, control group - block io controller (blkio), the rest · Maintainers:
Jens Axboe, Tejun Heo, Josef Bacik, Linus Torvalds
Try to merge continuous bio to current task's plug fisrt. Signed-off-by: Xianting Tian <redacted> --- block/blk-cgroup.c | 3 +++ 1 file changed, 3 insertions(+)
diff --git a/block/blk-cgroup.c b/block/blk-cgroup.c
index 0ecc897..fe5d361 100644
--- a/block/blk-cgroup.c
+++ b/block/blk-cgroup.c@@ -122,6 +122,7 @@ 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; /* as long as there are pending bios, @blkg can't go away */ spin_lock_bh(&blkg->async_bio_lock);
@@ -129,8 +130,10 @@ static void blkg_async_bio_workfn(struct work_struct *work) bio_list_init(&blkg->async_bios); spin_unlock_bh(&blkg->async_bio_lock); + blk_start_plug(&plug); while ((bio = bio_list_pop(&bios))) submit_bio(bio); + blk_finish_plug(&plug); } /**
--
1.8.3.1