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authorJan Kara <jack@suse.cz>2017-08-07 14:19:50 +0300
committerJan Kara <jack@suse.cz>2017-08-17 23:07:59 +0300
commit7b9ca4c61bc278b771fb57d6290a31ab1fc7fdac (patch)
tree3e9c7464525efa2a9dd50d02e7fe8f7df45a4961 /fs/ext4/super.c
parentf4a8116a4c8c8f754d0ec1498a2ba4b63d114e6a (diff)
downloadlinux-7b9ca4c61bc278b771fb57d6290a31ab1fc7fdac.tar.xz
quota: Reduce contention on dq_data_lock
dq_data_lock is currently used to protect all modifications of quota accounting information, consistency of quota accounting on the inode, and dquot pointers from inode. As a result contention on the lock can be pretty heavy. Reduce the contention on the lock by protecting quota accounting information by a new dquot->dq_dqb_lock and consistency of quota accounting with inode usage by inode->i_lock. This change reduces time to create 500000 files on ext4 on ramdisk by 50 different processes in separate directories by 6% when user quota is turned on. When those 50 processes belong to 50 different users, the improvement is about 9%. Signed-off-by: Jan Kara <jack@suse.cz>
Diffstat (limited to 'fs/ext4/super.c')
-rw-r--r--fs/ext4/super.c4
1 files changed, 2 insertions, 2 deletions
diff --git a/fs/ext4/super.c b/fs/ext4/super.c
index 16a877a0f309..67ce21224dab 100644
--- a/fs/ext4/super.c
+++ b/fs/ext4/super.c
@@ -5194,7 +5194,7 @@ static int ext4_statfs_project(struct super_block *sb,
dquot = dqget(sb, qid);
if (IS_ERR(dquot))
return PTR_ERR(dquot);
- spin_lock(&dq_data_lock);
+ spin_lock(&dquot->dq_dqb_lock);
limit = (dquot->dq_dqb.dqb_bsoftlimit ?
dquot->dq_dqb.dqb_bsoftlimit :
@@ -5217,7 +5217,7 @@ static int ext4_statfs_project(struct super_block *sb,
(buf->f_files - dquot->dq_dqb.dqb_curinodes) : 0;
}
- spin_unlock(&dq_data_lock);
+ spin_unlock(&dquot->dq_dqb_lock);
dqput(dquot);
return 0;
}