![Dave Chinner](/assets/img/avatar_default.png)
The AIL push code will issue a log force on ever single push loop that it exits and has encountered pinned items. It doesn't rescan these pinned items until it revisits the AIL from the start. Hence we only need to force the log once per walk from the start of the AIL to the target LSN. This results in numbers like this: xs_push_ail_flush..... 1456 xs_log_force......... 1485 For an 8-way 50M inode create workload - almost all the log forces are coming from the AIL pushing code. Reduce the number of log forces by only forcing the log if the previous walk found pinned buffers. This reduces the numbers to: xs_push_ail_flush..... 665 xs_log_force......... 682 For the same test. Signed-off-by: Dave Chinner <dchinner@redhat.com> Reviewed-by: Christoph Hellwig <hch@lst.de> Signed-off-by: Alex Elder <aelder@sgi.com>
151 lines
4.4 KiB
C
151 lines
4.4 KiB
C
/*
|
|
* Copyright (c) 2000,2002,2005 Silicon Graphics, Inc.
|
|
* All Rights Reserved.
|
|
*
|
|
* This program is free software; you can redistribute it and/or
|
|
* modify it under the terms of the GNU General Public License as
|
|
* published by the Free Software Foundation.
|
|
*
|
|
* This program is distributed in the hope that it would be useful,
|
|
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
* GNU General Public License for more details.
|
|
*
|
|
* You should have received a copy of the GNU General Public License
|
|
* along with this program; if not, write the Free Software Foundation,
|
|
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
|
|
*/
|
|
#ifndef __XFS_TRANS_PRIV_H__
|
|
#define __XFS_TRANS_PRIV_H__
|
|
|
|
struct xfs_log_item;
|
|
struct xfs_log_item_desc;
|
|
struct xfs_mount;
|
|
struct xfs_trans;
|
|
struct xfs_ail;
|
|
struct xfs_log_vec;
|
|
|
|
void xfs_trans_add_item(struct xfs_trans *, struct xfs_log_item *);
|
|
void xfs_trans_del_item(struct xfs_log_item *);
|
|
void xfs_trans_free_items(struct xfs_trans *tp, xfs_lsn_t commit_lsn,
|
|
int flags);
|
|
void xfs_trans_unreserve_and_mod_sb(struct xfs_trans *tp);
|
|
|
|
void xfs_trans_committed_bulk(struct xfs_ail *ailp, struct xfs_log_vec *lv,
|
|
xfs_lsn_t commit_lsn, int aborted);
|
|
/*
|
|
* AIL traversal cursor.
|
|
*
|
|
* Rather than using a generation number for detecting changes in the ail, use
|
|
* a cursor that is protected by the ail lock. The aild cursor exists in the
|
|
* struct xfs_ail, but other traversals can declare it on the stack and link it
|
|
* to the ail list.
|
|
*
|
|
* When an object is deleted from or moved int the AIL, the cursor list is
|
|
* searched to see if the object is a designated cursor item. If it is, it is
|
|
* deleted from the cursor so that the next time the cursor is used traversal
|
|
* will return to the start.
|
|
*
|
|
* This means a traversal colliding with a removal will cause a restart of the
|
|
* list scan, rather than any insertion or deletion anywhere in the list. The
|
|
* low bit of the item pointer is set if the cursor has been invalidated so
|
|
* that we can tell the difference between invalidation and reaching the end
|
|
* of the list to trigger traversal restarts.
|
|
*/
|
|
struct xfs_ail_cursor {
|
|
struct list_head list;
|
|
struct xfs_log_item *item;
|
|
};
|
|
|
|
/*
|
|
* Private AIL structures.
|
|
*
|
|
* Eventually we need to drive the locking in here as well.
|
|
*/
|
|
struct xfs_ail {
|
|
struct xfs_mount *xa_mount;
|
|
struct list_head xa_ail;
|
|
xfs_lsn_t xa_target;
|
|
struct list_head xa_cursors;
|
|
spinlock_t xa_lock;
|
|
struct delayed_work xa_work;
|
|
xfs_lsn_t xa_last_pushed_lsn;
|
|
unsigned long xa_flags;
|
|
int xa_log_flush;
|
|
};
|
|
|
|
#define XFS_AIL_PUSHING_BIT 0
|
|
|
|
/*
|
|
* From xfs_trans_ail.c
|
|
*/
|
|
|
|
extern struct workqueue_struct *xfs_ail_wq; /* AIL workqueue */
|
|
|
|
void xfs_trans_ail_update_bulk(struct xfs_ail *ailp,
|
|
struct xfs_ail_cursor *cur,
|
|
struct xfs_log_item **log_items, int nr_items,
|
|
xfs_lsn_t lsn) __releases(ailp->xa_lock);
|
|
static inline void
|
|
xfs_trans_ail_update(
|
|
struct xfs_ail *ailp,
|
|
struct xfs_log_item *lip,
|
|
xfs_lsn_t lsn) __releases(ailp->xa_lock)
|
|
{
|
|
xfs_trans_ail_update_bulk(ailp, NULL, &lip, 1, lsn);
|
|
}
|
|
|
|
void xfs_trans_ail_delete_bulk(struct xfs_ail *ailp,
|
|
struct xfs_log_item **log_items, int nr_items)
|
|
__releases(ailp->xa_lock);
|
|
static inline void
|
|
xfs_trans_ail_delete(
|
|
struct xfs_ail *ailp,
|
|
xfs_log_item_t *lip) __releases(ailp->xa_lock)
|
|
{
|
|
xfs_trans_ail_delete_bulk(ailp, &lip, 1);
|
|
}
|
|
|
|
void xfs_ail_push(struct xfs_ail *, xfs_lsn_t);
|
|
void xfs_ail_push_all(struct xfs_ail *);
|
|
xfs_lsn_t xfs_ail_min_lsn(struct xfs_ail *ailp);
|
|
|
|
void xfs_trans_unlocked_item(struct xfs_ail *,
|
|
xfs_log_item_t *);
|
|
|
|
struct xfs_log_item * xfs_trans_ail_cursor_first(struct xfs_ail *ailp,
|
|
struct xfs_ail_cursor *cur,
|
|
xfs_lsn_t lsn);
|
|
struct xfs_log_item * xfs_trans_ail_cursor_last(struct xfs_ail *ailp,
|
|
struct xfs_ail_cursor *cur,
|
|
xfs_lsn_t lsn);
|
|
struct xfs_log_item * xfs_trans_ail_cursor_next(struct xfs_ail *ailp,
|
|
struct xfs_ail_cursor *cur);
|
|
void xfs_trans_ail_cursor_done(struct xfs_ail *ailp,
|
|
struct xfs_ail_cursor *cur);
|
|
|
|
#if BITS_PER_LONG != 64
|
|
static inline void
|
|
xfs_trans_ail_copy_lsn(
|
|
struct xfs_ail *ailp,
|
|
xfs_lsn_t *dst,
|
|
xfs_lsn_t *src)
|
|
{
|
|
ASSERT(sizeof(xfs_lsn_t) == 8); /* don't lock if it shrinks */
|
|
spin_lock(&ailp->xa_lock);
|
|
*dst = *src;
|
|
spin_unlock(&ailp->xa_lock);
|
|
}
|
|
#else
|
|
static inline void
|
|
xfs_trans_ail_copy_lsn(
|
|
struct xfs_ail *ailp,
|
|
xfs_lsn_t *dst,
|
|
xfs_lsn_t *src)
|
|
{
|
|
ASSERT(sizeof(xfs_lsn_t) == 8);
|
|
*dst = *src;
|
|
}
|
|
#endif
|
|
#endif /* __XFS_TRANS_PRIV_H__ */
|