diff options
| author | Jan Kara <jack@suse.cz> | 2017-08-07 13:19:50 +0200 |
|---|---|---|
| committer | Jan Kara <jack@suse.cz> | 2017-08-17 22:07:59 +0200 |
| commit | 7b9ca4c61bc278b771fb57d6290a31ab1fc7fdac (patch) | |
| tree | 3e9c7464525efa2a9dd50d02e7fe8f7df45a4961 /fs/ocfs2/quota_local.c | |
| parent | f4a8116a4c8c8f754d0ec1498a2ba4b63d114e6a (diff) | |
| download | linux-7b9ca4c61bc278b771fb57d6290a31ab1fc7fdac.tar.gz linux-7b9ca4c61bc278b771fb57d6290a31ab1fc7fdac.tar.bz2 linux-7b9ca4c61bc278b771fb57d6290a31ab1fc7fdac.zip | |
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/ocfs2/quota_local.c')
| -rw-r--r-- | fs/ocfs2/quota_local.c | 8 |
1 files changed, 4 insertions, 4 deletions
diff --git a/fs/ocfs2/quota_local.c b/fs/ocfs2/quota_local.c index 2eeedcc2e9da..aa700fd10610 100644 --- a/fs/ocfs2/quota_local.c +++ b/fs/ocfs2/quota_local.c @@ -521,7 +521,7 @@ static int ocfs2_recover_local_quota_file(struct inode *lqinode, goto out_drop_lock; } down_write(&sb_dqopt(sb)->dqio_sem); - spin_lock(&dq_data_lock); + spin_lock(&dquot->dq_dqb_lock); /* Add usage from quota entry into quota changes * of our node. Auxiliary variables are important * due to signedness */ @@ -529,7 +529,7 @@ static int ocfs2_recover_local_quota_file(struct inode *lqinode, inodechange = le64_to_cpu(dqblk->dqb_inodemod); dquot->dq_dqb.dqb_curspace += spacechange; dquot->dq_dqb.dqb_curinodes += inodechange; - spin_unlock(&dq_data_lock); + spin_unlock(&dquot->dq_dqb_lock); /* We want to drop reference held by the crashed * node. Since we have our own reference we know * global structure actually won't be freed. */ @@ -877,12 +877,12 @@ static void olq_set_dquot(struct buffer_head *bh, void *private) dqblk->dqb_id = cpu_to_le64(from_kqid(&init_user_ns, od->dq_dquot.dq_id)); - spin_lock(&dq_data_lock); + spin_lock(&od->dq_dquot.dq_dqb_lock); dqblk->dqb_spacemod = cpu_to_le64(od->dq_dquot.dq_dqb.dqb_curspace - od->dq_origspace); dqblk->dqb_inodemod = cpu_to_le64(od->dq_dquot.dq_dqb.dqb_curinodes - od->dq_originodes); - spin_unlock(&dq_data_lock); + spin_unlock(&od->dq_dquot.dq_dqb_lock); trace_olq_set_dquot( (unsigned long long)le64_to_cpu(dqblk->dqb_spacemod), (unsigned long long)le64_to_cpu(dqblk->dqb_inodemod), |