From: Liu Bo <bo.liu@linux.alibaba.com>
Date: Fri, 29 Jun 2018 09:56:56 +0800
Subject: [PATCH] Block: blk-throttle: set low_valid immediately once one
cgroup has io.low configured
Git-commit: 43ada78781246cb36036f26158a645c17550ac54
Patch-mainline: v4.19-rc1
References: bsc#1104967,FATE#325924
Once one cgroup has io.low configured, @low_valid becomes true and other
cgroups won't switch it back whatsoever.
Signed-off-by: Liu Bo <bo.liu@linux.alibaba.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
Acked-by: Hannes Reinecke <hare@suse.com>
---
block/blk-throttle.c | 4 +++-
1 file changed, 3 insertions(+), 1 deletion(-)
diff --git a/block/blk-throttle.c b/block/blk-throttle.c
index 82282e6fdcf8..63bb261811dd 100644
--- a/block/blk-throttle.c
+++ b/block/blk-throttle.c
@@ -579,8 +579,10 @@ static void blk_throtl_update_limit_valid(struct throtl_data *td)
struct throtl_grp *tg = blkg_to_tg(blkg);
if (tg->bps[READ][LIMIT_LOW] || tg->bps[WRITE][LIMIT_LOW] ||
- tg->iops[READ][LIMIT_LOW] || tg->iops[WRITE][LIMIT_LOW])
+ tg->iops[READ][LIMIT_LOW] || tg->iops[WRITE][LIMIT_LOW]) {
low_valid = true;
+ break;
+ }
}
rcu_read_unlock();
--
2.16.4