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xfs: use per-filesystem I/O completion workqueues 

The new concurrency managed workqueues are cheap enough that we can create
per-filesystem instead of global workqueues.  This allows us to remove the
trylock or defer scheme on the ilock, which is not helpful once we have
outstanding log reservations until finishing a size update.

Also allow the default concurrency on this workqueues so that I/O completions
blocking on the ilock for one inode do not block process for another inode.

Reviewed-by: Dave Chinner <dchinner@redhat.com>
Reviewed-by: Mark Tinguely <tinguely@sgi.com>
Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Ben Myers <bpm@sgi.com>
This commit is contained in:
Christoph Hellwig 2012-02-29 09:53:48 +00:00 committed by Ben Myers
parent 4b217ed9e3
commit aa6bf01d39
5 changed files with 51 additions and 49 deletions
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37
fs/xfs/xfs_aops.c
View File

@ -126,21 +126,15 @@ static inline bool xfs_ioend_is_append(struct xfs_ioend *ioend)
/*
* Update on-disk file size now that data has been written to disk.
*
* This function does not block as blocking on the inode lock in IO completion
* can lead to IO completion order dependency deadlocks.. If it can't get the
* inode ilock it will return EAGAIN. Callers must handle this.
*/
STATIC int
STATIC void
xfs_setfilesize(
xfs_ioend_t *ioend)
struct xfs_ioend *ioend)
{
xfs_inode_t *ip = XFS_I(ioend->io_inode);
struct xfs_inode *ip = XFS_I(ioend->io_inode);
xfs_fsize_t isize;
if (!xfs_ilock_nowait(ip, XFS_ILOCK_EXCL))
return EAGAIN;
xfs_ilock(ip, XFS_ILOCK_EXCL);
isize = xfs_ioend_new_eof(ioend);
if (isize) {
trace_xfs_setfilesize(ip, ioend->io_offset, ioend->io_size);
@ -149,7 +143,6 @@ xfs_setfilesize(
}
xfs_iunlock(ip, XFS_ILOCK_EXCL);
return 0;
}
/*
@ -163,10 +156,12 @@ xfs_finish_ioend(
struct xfs_ioend *ioend)
{
if (atomic_dec_and_test(&ioend->io_remaining)) {
struct xfs_mount *mp = XFS_I(ioend->io_inode)->i_mount;
if (ioend->io_type == IO_UNWRITTEN)
queue_work(xfsconvertd_workqueue, &ioend->io_work);
queue_work(mp->m_unwritten_workqueue, &ioend->io_work);
else if (xfs_ioend_is_append(ioend))
queue_work(xfsdatad_workqueue, &ioend->io_work);
queue_work(mp->m_data_workqueue, &ioend->io_work);
else
xfs_destroy_ioend(ioend);
}
@ -207,23 +202,9 @@ xfs_end_io(
* We might have to update the on-disk file size after extending
* writes.
*/
error = xfs_setfilesize(ioend);
ASSERT(!error || error == EAGAIN);
xfs_setfilesize(ioend);
done:
/*
* If we didn't complete processing of the ioend, requeue it to the
* tail of the workqueue for another attempt later. Otherwise destroy
* it.
*/
if (error == EAGAIN) {
atomic_inc(&ioend->io_remaining);
xfs_finish_ioend(ioend);
/* ensure we don't spin on blocked ioends */
delay(1);
} else {
xfs_destroy_ioend(ioend);
}
}
/*

2
fs/xfs/xfs_aops.h
View File

@ -18,8 +18,6 @@
#ifndef __XFS_AOPS_H__
#define __XFS_AOPS_H__
extern struct workqueue_struct *xfsdatad_workqueue;
extern struct workqueue_struct *xfsconvertd_workqueue;
extern mempool_t *xfs_ioend_pool;
/*

17
fs/xfs/xfs_buf.c
View File

@ -45,8 +45,6 @@ static kmem_zone_t *xfs_buf_zone;
STATIC int xfsbufd(void *);
static struct workqueue_struct *xfslogd_workqueue;
struct workqueue_struct *xfsdatad_workqueue;
struct workqueue_struct *xfsconvertd_workqueue;
#ifdef XFS_BUF_LOCK_TRACKING
# define XB_SET_OWNER(bp) ((bp)->b_last_holder = current->pid)
@ -1793,21 +1791,8 @@ xfs_buf_init(void)
if (!xfslogd_workqueue)
goto out_free_buf_zone;
xfsdatad_workqueue = alloc_workqueue("xfsdatad", WQ_MEM_RECLAIM, 1);
if (!xfsdatad_workqueue)
goto out_destroy_xfslogd_workqueue;
xfsconvertd_workqueue = alloc_workqueue("xfsconvertd",
WQ_MEM_RECLAIM, 1);
if (!xfsconvertd_workqueue)
goto out_destroy_xfsdatad_workqueue;
return 0;
out_destroy_xfsdatad_workqueue:
destroy_workqueue(xfsdatad_workqueue);
out_destroy_xfslogd_workqueue:
destroy_workqueue(xfslogd_workqueue);
out_free_buf_zone:
kmem_zone_destroy(xfs_buf_zone);
out:
@ -1817,8 +1802,6 @@ xfs_buf_init(void)
void
xfs_buf_terminate(void)
{
destroy_workqueue(xfsconvertd_workqueue);
destroy_workqueue(xfsdatad_workqueue);
destroy_workqueue(xfslogd_workqueue);
kmem_zone_destroy(xfs_buf_zone);
}

3
fs/xfs/xfs_mount.h
View File

@ -211,6 +211,9 @@ typedef struct xfs_mount {
struct shrinker m_inode_shrink; /* inode reclaim shrinker */
int64_t m_low_space[XFS_LOWSP_MAX];
/* low free space thresholds */
struct workqueue_struct *m_data_workqueue;
struct workqueue_struct *m_unwritten_workqueue;
} xfs_mount_t;
/*

39
fs/xfs/xfs_super.c
View File

@ -759,6 +759,36 @@ xfs_setup_devices(
return 0;
}
STATIC int
xfs_init_mount_workqueues(
struct xfs_mount *mp)
{
mp->m_data_workqueue = alloc_workqueue("xfs-data/%s",
WQ_MEM_RECLAIM, 0, mp->m_fsname);
if (!mp->m_data_workqueue)
goto out;
mp->m_unwritten_workqueue = alloc_workqueue("xfs-conv/%s",
WQ_MEM_RECLAIM, 0, mp->m_fsname);
if (!mp->m_unwritten_workqueue)
goto out_destroy_data_iodone_queue;
return 0;
out_destroy_data_iodone_queue:
destroy_workqueue(mp->m_data_workqueue);
out:
return -ENOMEM;
}
STATIC void
xfs_destroy_mount_workqueues(
struct xfs_mount *mp)
{
destroy_workqueue(mp->m_data_workqueue);
destroy_workqueue(mp->m_unwritten_workqueue);
}
/* Catch misguided souls that try to use this interface on XFS */
STATIC struct inode *
xfs_fs_alloc_inode(
@ -982,6 +1012,7 @@ xfs_fs_put_super(
xfs_unmountfs(mp);
xfs_freesb(mp);
xfs_icsb_destroy_counters(mp);
xfs_destroy_mount_workqueues(mp);
xfs_close_devices(mp);
xfs_free_fsname(mp);
kfree(mp);
@ -1308,10 +1339,14 @@ xfs_fs_fill_super(
if (error)
goto out_free_fsname;
error = xfs_icsb_init_counters(mp);
error = xfs_init_mount_workqueues(mp);
if (error)
goto out_close_devices;
error = xfs_icsb_init_counters(mp);
if (error)
goto out_destroy_workqueues;
error = xfs_readsb(mp, flags);
if (error)
goto out_destroy_counters;
@ -1374,6 +1409,8 @@ xfs_fs_fill_super(
xfs_freesb(mp);
out_destroy_counters:
xfs_icsb_destroy_counters(mp);
out_destroy_workqueues:
xfs_destroy_mount_workqueues(mp);
out_close_devices:
xfs_close_devices(mp);
out_free_fsname: