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authorChunguang Xu <brookxu@tencent.com>2021-01-25 13:05:28 +0800
committerJens Axboe <axboe@kernel.dk>2021-01-26 13:14:30 -0700
commit49d1822bc05e702be1665ffc2092ec5711e77491 (patch)
tree7eac30c97fadabfa253974bdba1609706a19f36d /block
parent2c2b9fd6b496b3616e9b9537ea0258b3040914f3 (diff)
blkcg: delete redundant get/put operations for queue
When calling blkcg_schedule_throttle(), for the same queue, redundant get/put operations can be removed. Signed-off-by: Chunguang Xu <brookxu@tencent.com> Acked-by: Tejun Heo <tj@kernel.org> Signed-off-by: Jens Axboe <axboe@kernel.dk>
Diffstat (limited to 'block')
-rw-r--r--block/blk-cgroup.c13
1 files changed, 8 insertions, 5 deletions
diff --git a/block/blk-cgroup.c b/block/blk-cgroup.c
index 3465d6ee708e..02ce2058c14b 100644
--- a/block/blk-cgroup.c
+++ b/block/blk-cgroup.c
@@ -1757,12 +1757,15 @@ void blkcg_schedule_throttle(struct request_queue *q, bool use_memdelay)
if (unlikely(current->flags & PF_KTHREAD))
return;
- if (!blk_get_queue(q))
- return;
+ if (current->throttle_queue != q) {
+ if (!blk_get_queue(q))
+ return;
+
+ if (current->throttle_queue)
+ blk_put_queue(current->throttle_queue);
+ current->throttle_queue = q;
+ }
- if (current->throttle_queue)
- blk_put_queue(current->throttle_queue);
- current->throttle_queue = q;
if (use_memdelay)
current->use_memdelay = use_memdelay;
set_notify_resume(current);