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_global.c | |
| parent | f4a8116a4c8c8f754d0ec1498a2ba4b63d114e6a (diff) | |
| download | linux-next-7b9ca4c61bc278b771fb57d6290a31ab1fc7fdac.tar.gz | |
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.c | 8 |
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()) { |