[PATCH RESEND] blkcg: delete redundant get/put operations for queue
From: Chunguang Xu <hidden>
Date: 2021-01-25 05:07:02
From: Chunguang Xu <redacted> When calling blkcg_schedule_throttle(), for the same queue, redundant get/put operations can be removed. Signed-off-by: Chunguang Xu <redacted> Acked-by: Tejun Heo <tj@kernel.org> --- block/blk-cgroup.c | 13 ++++++++----- 1 file changed, 8 insertions(+), 5 deletions(-)
diff --git a/block/blk-cgroup.c b/block/blk-cgroup.c
index 031114d..e9b264b 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);
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1.8.3.1