From: Kemeng Shi <shikemeng@huaweicloud.com> mainline inclusion from mainline-v6.9-rc1 commit efc4105a4cf9e300b8e9150147415fa235059293 category: performance bugzilla: https://gitee.com/src-openeuler/kernel/issues/IC6CFR Reference: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?i... -------------------------------- Commit 670d21c6e17f6 ("fuse: remove reliance on bdi congestion") change how congestion_threshold is used and lock in fuse_conn_congestion_threshold_write is not needed anymore. 1. Access to supe_block is removed along with removing of bdi congestion. Then down_read(&fc->killsb) which protecting access to super_block is no needed. 2. Compare num_background and congestion_threshold without holding bg_lock. Then there is no need to hold bg_lock to update congestion_threshold. Signed-off-by: Kemeng Shi <shikemeng@huaweicloud.com> Signed-off-by: Miklos Szeredi <mszeredi@redhat.com> Signed-off-by: Wang Zhaolong <wangzhaolong1@huawei.com> --- fs/fuse/control.c | 6 +----- 1 file changed, 1 insertion(+), 5 deletions(-) diff --git a/fs/fuse/control.c b/fs/fuse/control.c index ab62e4624256..1bf928e277fe 100644 --- a/fs/fuse/control.c +++ b/fs/fuse/control.c @@ -172,15 +172,11 @@ static ssize_t fuse_conn_congestion_threshold_write(struct file *file, goto out; fc = fuse_ctl_file_conn_get(file); if (!fc) goto out; - down_read(&fc->killsb); - spin_lock(&fc->bg_lock); - fc->congestion_threshold = val; - spin_unlock(&fc->bg_lock); - up_read(&fc->killsb); + WRITE_ONCE(fc->congestion_threshold, val); fuse_conn_put(fc); out: return ret; } -- 2.34.3