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xfs: convert buffer cache hash to rbtree 

The buffer cache hash is showing typical hash scalability problems.
In large scale testing the number of cached items growing far larger
than the hash can efficiently handle. Hence we need to move to a
self-scaling cache indexing mechanism.

I have selected rbtrees for indexing becuse they can have O(log n)
search scalability, and insert and remove cost is not excessive,
even on large trees. Hence we should be able to cache large numbers
of buffers without incurring the excessive cache miss search
penalties that the hash is imposing on us.

To ensure we still have parallel access to the cache, we need
multiple trees. Rather than hashing the buffers by disk address to
select a tree, it seems more sensible to separate trees by typical
access patterns. Most operations use buffers from within a single AG
at a time, so rather than searching lots of different lists,
separate the buffer indexes out into per-AG rbtrees. This means that
searches during metadata operation have a much higher chance of
hitting cache resident nodes, and that updates of the tree are less
likely to disturb trees being accessed on other CPUs doing
independent operations.

Signed-off-by: Dave Chinner <dchinner@redhat.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Alex Elder <aelder@sgi.com>
This commit is contained in:
Dave Chinner 2010-09-24 19:59:04 +10:00 committed by Alex Elder
parent 69b491c214
commit 74f75a0cb7
4 changed files with 72 additions and 74 deletions
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132
fs/xfs/linux-2.6/xfs_buf.c
View File

@ -188,7 +188,7 @@ _xfs_buf_initialize(
atomic_set(&bp->b_hold, 1);
init_completion(&bp->b_iowait);
INIT_LIST_HEAD(&bp->b_list);
INIT_LIST_HEAD(&bp->b_hash_list);
RB_CLEAR_NODE(&bp->b_rbnode);
init_MUTEX_LOCKED(&bp->b_sema); /* held, no waiters */
XB_SET_OWNER(bp);
bp->b_target = target;
@ -262,8 +262,6 @@ xfs_buf_free(
{
trace_xfs_buf_free(bp, _RET_IP_);
ASSERT(list_empty(&bp->b_hash_list));
if (bp->b_flags & (_XBF_PAGE_CACHE|_XBF_PAGES)) {
uint i;
@ -422,8 +420,10 @@ _xfs_buf_find(
{
xfs_off_t range_base;
size_t range_length;
xfs_bufhash_t *hash;
xfs_buf_t *bp, *n;
struct xfs_perag *pag;
struct rb_node **rbp;
struct rb_node *parent;
xfs_buf_t *bp;
range_base = (ioff << BBSHIFT);
range_length = (isize << BBSHIFT);
@ -432,14 +432,37 @@ _xfs_buf_find(
ASSERT(!(range_length < (1 << btp->bt_sshift)));
ASSERT(!(range_base & (xfs_off_t)btp->bt_smask));
hash = &btp->bt_hash[hash_long((unsigned long)ioff, btp->bt_hashshift)];
/* get tree root */
pag = xfs_perag_get(btp->bt_mount,
xfs_daddr_to_agno(btp->bt_mount, ioff));
spin_lock(&hash->bh_lock);
/* walk tree */
spin_lock(&pag->pag_buf_lock);
rbp = &pag->pag_buf_tree.rb_node;
parent = NULL;
bp = NULL;
while (*rbp) {
parent = *rbp;
bp = rb_entry(parent, struct xfs_buf, b_rbnode);
list_for_each_entry_safe(bp, n, &hash->bh_list, b_hash_list) {
ASSERT(btp == bp->b_target);
if (bp->b_file_offset == range_base &&
bp->b_buffer_length == range_length) {
if (range_base < bp->b_file_offset)
rbp = &(*rbp)->rb_left;
else if (range_base > bp->b_file_offset)
rbp = &(*rbp)->rb_right;
else {
/*
* found a block offset match. If the range doesn't
* match, the only way this is allowed is if the buffer
* in the cache is stale and the transaction that made
* it stale has not yet committed. i.e. we are
* reallocating a busy extent. Skip this buffer and
* continue searching to the right for an exact match.
*/
if (bp->b_buffer_length != range_length) {
ASSERT(bp->b_flags & XBF_STALE);
rbp = &(*rbp)->rb_right;
continue;
}
atomic_inc(&bp->b_hold);
goto found;
}
@ -449,17 +472,21 @@ _xfs_buf_find(
if (new_bp) {
_xfs_buf_initialize(new_bp, btp, range_base,
range_length, flags);
new_bp->b_hash = hash;
list_add(&new_bp->b_hash_list, &hash->bh_list);
rb_link_node(&new_bp->b_rbnode, parent, rbp);
rb_insert_color(&new_bp->b_rbnode, &pag->pag_buf_tree);
/* the buffer keeps the perag reference until it is freed */
new_bp->b_pag = pag;
spin_unlock(&pag->pag_buf_lock);
} else {
XFS_STATS_INC(xb_miss_locked);
spin_unlock(&pag->pag_buf_lock);
xfs_perag_put(pag);
}
spin_unlock(&hash->bh_lock);
return new_bp;
found:
spin_unlock(&hash->bh_lock);
spin_unlock(&pag->pag_buf_lock);
xfs_perag_put(pag);
/* Attempt to get the semaphore without sleeping,
* if this does not work then we need to drop the
@ -809,27 +836,30 @@ void
xfs_buf_rele(
xfs_buf_t *bp)
{
xfs_bufhash_t *hash = bp->b_hash;
struct xfs_perag *pag = bp->b_pag;
trace_xfs_buf_rele(bp, _RET_IP_);
if (unlikely(!hash)) {
if (!pag) {
ASSERT(!bp->b_relse);
ASSERT(RB_EMPTY_NODE(&bp->b_rbnode));
if (atomic_dec_and_test(&bp->b_hold))
xfs_buf_free(bp);
return;
}
ASSERT(!RB_EMPTY_NODE(&bp->b_rbnode));
ASSERT(atomic_read(&bp->b_hold) > 0);
if (atomic_dec_and_lock(&bp->b_hold, &hash->bh_lock)) {
if (atomic_dec_and_lock(&bp->b_hold, &pag->pag_buf_lock)) {
if (bp->b_relse) {
atomic_inc(&bp->b_hold);
spin_unlock(&hash->bh_lock);
(*(bp->b_relse)) (bp);
spin_unlock(&pag->pag_buf_lock);
bp->b_relse(bp);
} else {
ASSERT(!(bp->b_flags & (XBF_DELWRI|_XBF_DELWRI_Q)));
list_del_init(&bp->b_hash_list);
spin_unlock(&hash->bh_lock);
rb_erase(&bp->b_rbnode, &pag->pag_buf_tree);
spin_unlock(&pag->pag_buf_lock);
xfs_perag_put(pag);
xfs_buf_free(bp);
}
}
@ -1429,56 +1459,24 @@ xfs_buf_iomove(
*/
void
xfs_wait_buftarg(
xfs_buftarg_t *btp)
struct xfs_buftarg *btp)
{
xfs_bufhash_t *hash;
uint i;
struct xfs_perag *pag;
uint i;
for (i = 0; i < (1 << btp->bt_hashshift); i++) {
hash = &btp->bt_hash[i];
spin_lock(&hash->bh_lock);
while (!list_empty(&hash->bh_list)) {
spin_unlock(&hash->bh_lock);
for (i = 0; i < btp->bt_mount->m_sb.sb_agcount; i++) {
pag = xfs_perag_get(btp->bt_mount, i);
spin_lock(&pag->pag_buf_lock);
while (rb_first(&pag->pag_buf_tree)) {
spin_unlock(&pag->pag_buf_lock);
delay(100);
spin_lock(&hash->bh_lock);
spin_lock(&pag->pag_buf_lock);
}
spin_unlock(&hash->bh_lock);
spin_unlock(&pag->pag_buf_lock);
xfs_perag_put(pag);
}
}
/*
* Allocate buffer hash table for a given target.
* For devices containing metadata (i.e. not the log/realtime devices)
* we need to allocate a much larger hash table.
*/
STATIC void
xfs_alloc_bufhash(
xfs_buftarg_t *btp,
int external)
{
unsigned int i;
if (external) {
btp->bt_hash = NULL;
return;
}
btp->bt_hashshift = 12; /* 4096 buckets */
btp->bt_hash = kmem_zalloc_large((1 << btp->bt_hashshift) *
sizeof(xfs_bufhash_t));
for (i = 0; i < (1 << btp->bt_hashshift); i++) {
spin_lock_init(&btp->bt_hash[i].bh_lock);
INIT_LIST_HEAD(&btp->bt_hash[i].bh_list);
}
}
STATIC void
xfs_free_bufhash(
xfs_buftarg_t *btp)
{
kmem_free_large(btp->bt_hash);
btp->bt_hash = NULL;
}
/*
* buftarg list for delwrite queue processing
*/
@ -1511,7 +1509,6 @@ xfs_free_buftarg(
xfs_flush_buftarg(btp, 1);
if (mp->m_flags & XFS_MOUNT_BARRIER)
xfs_blkdev_issue_flush(btp);
xfs_free_bufhash(btp);
iput(btp->bt_mapping->host);
/* Unregister the buftarg first so that we don't get a
@ -1651,7 +1648,6 @@ xfs_alloc_buftarg(
goto error;
if (xfs_alloc_delwrite_queue(btp, fsname))
goto error;
xfs_alloc_bufhash(btp, external);
return btp;
error:

8
fs/xfs/linux-2.6/xfs_buf.h
View File

@ -135,10 +135,6 @@ typedef struct xfs_buftarg {
unsigned int bt_sshift;
size_t bt_smask;
/* per device buffer hash table */
uint bt_hashshift;
xfs_bufhash_t *bt_hash;
/* per device delwri queue */
struct task_struct *bt_task;
struct list_head bt_list;
@ -172,8 +168,8 @@ typedef struct xfs_buf {
wait_queue_head_t b_waiters; /* unpin waiters */
struct list_head b_list;
xfs_buf_flags_t b_flags; /* status flags */
struct list_head b_hash_list; /* hash table list */
xfs_bufhash_t *b_hash; /* hash table list start */
struct rb_node b_rbnode; /* rbtree node */
struct xfs_perag *b_pag; /* contains rbtree root */
xfs_buftarg_t *b_target; /* buffer target (device) */
atomic_t b_hold; /* reference count */
xfs_daddr_t b_bn; /* block number for I/O */

4
fs/xfs/xfs_ag.h
View File

@ -233,6 +233,10 @@ typedef struct xfs_perag {
struct mutex pag_ici_reclaim_lock; /* serialisation point */
unsigned long pag_ici_reclaim_cursor; /* reclaim restart point */
/* buffer cache index */
spinlock_t pag_buf_lock; /* lock for pag_buf_tree */
struct rb_root pag_buf_tree; /* ordered tree of active buffers */
/* for rcu-safe freeing */
struct rcu_head rcu_head;
#endif

2
fs/xfs/xfs_mount.c
View File

@ -479,6 +479,8 @@ xfs_initialize_perag(
rwlock_init(&pag->pag_ici_lock);
mutex_init(&pag->pag_ici_reclaim_lock);
INIT_RADIX_TREE(&pag->pag_ici_root, GFP_ATOMIC);
spin_lock_init(&pag->pag_buf_lock);
pag->pag_buf_tree = RB_ROOT;
if (radix_tree_preload(GFP_NOFS))
goto out_unwind;