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xfs: force buffer writeback before blocking on the ilock in inode reclaim 

If we are doing synchronous inode reclaim we block the VM from making
progress in memory reclaim.  So if we encouter a flush locked inode
promote it in the delwri list and wake up xfsbufd to write it out now.
Without this we can get hangs of up to 30 seconds during workloads hitting
synchronous inode reclaim.

The scheme is copied from what we do for dquot reclaims.

Reported-by: Simon Kirby <sim@hostway.ca>
Signed-off-by: Christoph Hellwig <hch@lst.de>
Tested-by: Simon Kirby <sim@hostway.ca>
Signed-off-by: Ben Myers <bpm@sgi.com>
This commit is contained in:
Christoph Hellwig 2011-11-29 12:06:14 -06:00 committed by Ben Myers
parent fa8b18edd7
commit 4dd2cb4a28
3 changed files with 33 additions and 0 deletions
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21
fs/xfs/xfs_inode.c
View File

@ -2835,6 +2835,27 @@ corrupt_out:
return XFS_ERROR(EFSCORRUPTED);
}
void
xfs_promote_inode(
struct xfs_inode *ip)
{
struct xfs_buf *bp;
ASSERT(xfs_isilocked(ip, XFS_ILOCK_EXCL|XFS_ILOCK_SHARED));
bp = xfs_incore(ip->i_mount->m_ddev_targp, ip->i_imap.im_blkno,
ip->i_imap.im_len, XBF_TRYLOCK);
if (!bp)
return;
if (XFS_BUF_ISDELAYWRITE(bp)) {
xfs_buf_delwri_promote(bp);
wake_up_process(ip->i_mount->m_ddev_targp->bt_task);
}
xfs_buf_relse(bp);
}
/*
* Return a pointer to the extent record at file index idx.
*/

1
fs/xfs/xfs_inode.h
View File

@ -498,6 +498,7 @@ int xfs_iunlink(struct xfs_trans *, xfs_inode_t *);
void xfs_iext_realloc(xfs_inode_t *, int, int);
void xfs_iunpin_wait(xfs_inode_t *);
int xfs_iflush(xfs_inode_t *, uint);
void xfs_promote_inode(struct xfs_inode *);
void xfs_lock_inodes(xfs_inode_t **, int, uint);
void xfs_lock_two_inodes(xfs_inode_t *, xfs_inode_t *, uint);

11
fs/xfs/xfs_sync.c
View File

@ -770,6 +770,17 @@ restart:
if (!xfs_iflock_nowait(ip)) {
if (!(sync_mode & SYNC_WAIT))
goto out;
/*
* If we only have a single dirty inode in a cluster there is
* a fair chance that the AIL push may have pushed it into
* the buffer, but xfsbufd won't touch it until 30 seconds
* from now, and thus we will lock up here.
*
* Promote the inode buffer to the front of the delwri list
* and wake up xfsbufd now.
*/
xfs_promote_inode(ip);
xfs_iflock(ip);
}