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authorJan Kara <jack@suse.cz>2017-08-07 13:19:50 +0200
committerJan Kara <jack@suse.cz>2017-08-17 22:07:59 +0200
commit7b9ca4c61bc278b771fb57d6290a31ab1fc7fdac (patch)
tree3e9c7464525efa2a9dd50d02e7fe8f7df45a4961 /fs/ocfs2/quota_global.c
parentf4a8116a4c8c8f754d0ec1498a2ba4b63d114e6a (diff)
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_global.c')
-rw-r--r--fs/ocfs2/quota_global.c8
1 files changed, 4 insertions, 4 deletions
diff --git a/fs/ocfs2/quota_global.c b/fs/ocfs2/quota_global.c
index 78f3a869748c..c94b6baaa551 100644
--- a/fs/ocfs2/quota_global.c
+++ b/fs/ocfs2/quota_global.c
@@ -504,7 +504,7 @@ int __ocfs2_sync_dquot(struct dquot *dquot, int freeing)
/* Update space and inode usage. Get also other information from
* global quota file so that we don't overwrite any changes there.
* We are */
- spin_lock(&dq_data_lock);
+ spin_lock(&dquot->dq_dqb_lock);
spacechange = dquot->dq_dqb.dqb_curspace -
OCFS2_DQUOT(dquot)->dq_origspace;
inodechange = dquot->dq_dqb.dqb_curinodes -
@@ -560,7 +560,7 @@ int __ocfs2_sync_dquot(struct dquot *dquot, int freeing)
__clear_bit(DQ_LASTSET_B + QIF_ITIME_B, &dquot->dq_flags);
OCFS2_DQUOT(dquot)->dq_origspace = dquot->dq_dqb.dqb_curspace;
OCFS2_DQUOT(dquot)->dq_originodes = dquot->dq_dqb.dqb_curinodes;
- spin_unlock(&dq_data_lock);
+ spin_unlock(&dquot->dq_dqb_lock);
err = ocfs2_qinfo_lock(info, freeing);
if (err < 0) {
mlog(ML_ERROR, "Failed to lock quota info, losing quota write"
@@ -924,10 +924,10 @@ static int ocfs2_mark_dquot_dirty(struct dquot *dquot)
/* In case user set some limits, sync dquot immediately to global
* quota file so that information propagates quicker */
- spin_lock(&dq_data_lock);
+ spin_lock(&dquot->dq_dqb_lock);
if (dquot->dq_flags & mask)
sync = 1;
- spin_unlock(&dq_data_lock);
+ spin_unlock(&dquot->dq_dqb_lock);
/* This is a slight hack but we can't afford getting global quota
* lock if we already have a transaction started. */
if (!sync || journal_current_handle()) {