[patch 51/52] fs: per-zone dentry and inode LRU

npiggin
2010-06-24T03:26:21Z

[-- Attachment #1: fs-dcache-per-zone-lru.patch --]
[-- Type: text/plain, Size: 20959 bytes --]

Per-zone LRUs and shrinkers for dentry and inode caches.

Signed-off-by: Nick Piggin <npiggin@suse.de>

Index: linux-2.6/include/linux/fs.h
===================================================================
--- linux-2.6.orig/include/linux/fs.h
+++ linux-2.6/include/linux/fs.h
@@ -382,6 +382,7 @@ struct files_stat_struct {
#include <linux/semaphore.h>
#include <linux/fiemap.h>
#include <linux/rculist_bl.h>
+#include <linux/mmzone.h>

#include <asm/atomic.h>
#include <asm/byteorder.h>
@@ -1325,6 +1326,25 @@ extern int send_sigurg(struct fown_struc
extern struct list_head super_blocks;
extern spinlock_t sb_lock;

+#define sb_zone_info(sb, ___z) \
+ &sb->s_reclaim.node[zone_to_nid(___z)].zone[zone_idx(___z)]
+
+struct sb_zoneinfo {
+ /* protected by zone->dentry_lru_lock */
+ spinlock_t s_dentry_lru_lock;
+ struct list_head s_dentry_lru;
+ long s_nr_dentry_scan;
+ unsigned long s_nr_dentry_unused;
+};
+
+struct sb_nodeinfo {
+ struct sb_zoneinfo zone[MAX_NR_ZONES];
+};
+
+struct sb_reclaim {
+ struct sb_nodeinfo node[MAX_NUMNODES];
+};
+
struct super_block {
struct list_head s_list; /* Keep this first */
dev_t s_dev; /* search index; _not_ kdev_t */
@@ -1357,9 +1377,7 @@ struct super_block {
struct list_head s_inodes; /* all inodes */
struct list_head s_files;
#endif
- /* s_dentry_lru and s_nr_dentry_unused are protected by dcache_lock */
- struct list_head s_dentry_lru; /* unused dentry lru */
- int s_nr_dentry_unused; /* # of dentry on lru */
+ struct sb_reclaim s_reclaim;

struct block_device *s_bdev;
struct backing_dev_info *s_bdi;
Index: linux-2.6/fs/dcache.c
===================================================================
--- linux-2.6.orig/fs/dcache.c
+++ linux-2.6/fs/dcache.c
@@ -43,8 +43,8 @@
* - i_dentry, d_alias, d_inode of aliases
* dcache_hash_bucket lock protects:
* - the dcache hash table
- * dcache_lru_lock protects:
- * - the dcache lru lists and counters
+ * sbz->s_dcache_lru_lock protects:
+ * - the per-sb x per-zone dcache lru lists and counters
* d_lock protects:
* - d_flags
* - d_name
@@ -58,7 +58,7 @@
* Ordering:
* dentry->d_inode->i_lock
* dentry->d_lock
- * dcache_lru_lock
+ * sbz->s_dcache_lru_lock
* dcache_hash_bucket lock
*
* If there is an ancestor relationship:
@@ -75,7 +75,6 @@
int sysctl_vfs_cache_pressure __read_mostly = 100;
EXPORT_SYMBOL_GPL(sysctl_vfs_cache_pressure);

-static __cacheline_aligned_in_smp DEFINE_SPINLOCK(dcache_lru_lock);
__cacheline_aligned_in_smp DEFINE_SEQLOCK(rename_lock);

EXPORT_SYMBOL(rename_lock);
@@ -186,51 +185,55 @@ static void dentry_iput(struct dentry *
*/
static void dentry_lru_add(struct dentry *dentry)
{
- spin_lock(&dcache_lru_lock);
- list_add(&dentry->d_lru, &dentry->d_sb->s_dentry_lru);
- dentry->d_sb->s_nr_dentry_unused++;
- dentry_stat.nr_unused++;
- spin_unlock(&dcache_lru_lock);
+ struct sb_zoneinfo *sbz = sb_zone_info(dentry->d_sb,
+ page_zone(virt_to_page(dentry)));
+ spin_lock(&sbz->s_dentry_lru_lock);
+ list_add(&dentry->d_lru, &sbz->s_dentry_lru);
+ sbz->s_nr_dentry_unused++;
+ spin_unlock(&sbz->s_dentry_lru_lock);
}

static void dentry_lru_add_tail(struct dentry *dentry)
{
- spin_lock(&dcache_lru_lock);
- list_add_tail(&dentry->d_lru, &dentry->d_sb->s_dentry_lru);
- dentry->d_sb->s_nr_dentry_unused++;
- dentry_stat.nr_unused++;
- spin_unlock(&dcache_lru_lock);
+ struct sb_zoneinfo *sbz = sb_zone_info(dentry->d_sb,
+ page_zone(virt_to_page(dentry)));
+ spin_lock(&sbz->s_dentry_lru_lock);
+ list_add_tail(&dentry->d_lru, &sbz->s_dentry_lru);
+ sbz->s_nr_dentry_unused++;
+ spin_unlock(&sbz->s_dentry_lru_lock);
}

-static void __dentry_lru_del(struct dentry *dentry)
+static void __dentry_lru_del(struct sb_zoneinfo *sbz, struct dentry *dentry)
{
list_del(&dentry->d_lru);
- dentry->d_sb->s_nr_dentry_unused--;
- dentry_stat.nr_unused--;
+ sbz->s_nr_dentry_unused--;
}

-static void __dentry_lru_del_init(struct dentry *dentry)
+static void __dentry_lru_del_init(struct sb_zoneinfo *sbz,struct dentry *dentry)
{
list_del_init(&dentry->d_lru);
- dentry->d_sb->s_nr_dentry_unused--;
- dentry_stat.nr_unused--;
+ sbz->s_nr_dentry_unused--;
}

static void dentry_lru_del(struct dentry *dentry)
{
if (!list_empty(&dentry->d_lru)) {
- spin_lock(&dcache_lru_lock);
- __dentry_lru_del(dentry);
- spin_unlock(&dcache_lru_lock);
+ struct sb_zoneinfo *sbz = sb_zone_info(dentry->d_sb,
+ page_zone(virt_to_page(dentry)));
+ spin_lock(&sbz->s_dentry_lru_lock);
+ __dentry_lru_del(sbz, dentry);
+ spin_unlock(&sbz->s_dentry_lru_lock);
}
}

static void dentry_lru_del_init(struct dentry *dentry)
{
if (likely(!list_empty(&dentry->d_lru))) {
- spin_lock(&dcache_lru_lock);
- __dentry_lru_del_init(dentry);
- spin_unlock(&dcache_lru_lock);
+ struct sb_zoneinfo *sbz = sb_zone_info(dentry->d_sb,
+ page_zone(virt_to_page(dentry)));
+ spin_lock(&sbz->s_dentry_lru_lock);
+ __dentry_lru_del_init(sbz, dentry);
+ spin_unlock(&sbz->s_dentry_lru_lock);
}
}

@@ -638,32 +641,33 @@ again:
* which flags are set. This means we don't need to maintain multiple
* similar copies of this loop.
*/
-static void __shrink_dcache_sb(struct super_block *sb, int *count, int flags)
+static void __shrink_dcache_sb_zone(struct super_block *sb,
+ struct sb_zoneinfo *sbz, unsigned long *count, int flags)
{
LIST_HEAD(referenced);
LIST_HEAD(tmp);
struct dentry *dentry;
- int cnt = 0;
+ unsigned long cnt = 0;

BUG_ON(!sb);
BUG_ON((flags & DCACHE_REFERENCED) && count == NULL);
if (count != NULL)
/* called from prune_dcache() and shrink_dcache_parent() */
cnt = *count;
-relock:
- spin_lock(&dcache_lru_lock);
restart:
if (count == NULL)
- list_splice_init(&sb->s_dentry_lru, &tmp);
+ list_splice_init(&sbz->s_dentry_lru, &tmp);
else {
- while (!list_empty(&sb->s_dentry_lru)) {
- dentry = list_entry(sb->s_dentry_lru.prev,
- struct dentry, d_lru);
+ while (!list_empty(&sbz->s_dentry_lru)) {
+ dentry = list_entry(sbz->s_dentry_lru.prev,
+ struct dentry, d_lru);
BUG_ON(dentry->d_sb != sb);

if (!spin_trylock(&dentry->d_lock)) {
- spin_unlock(&dcache_lru_lock);
- goto relock;
+ spin_unlock(&sbz->s_dentry_lru_lock);
+ cpu_relax();
+ spin_lock(&sbz->s_dentry_lru_lock);
+ continue;
}
/*
* If we are honouring the DCACHE_REFERENCED flag and
@@ -682,13 +686,10 @@ restart:
if (!cnt)
break;
}
- cond_resched_lock(&dcache_lru_lock);
+ cond_resched_lock(&sbz->s_dentry_lru_lock);
}
}
- spin_unlock(&dcache_lru_lock);

-again:
- spin_lock(&dcache_lru_lock); /* lru_lock also protects tmp list */
while (!list_empty(&tmp)) {
struct inode *inode;

@@ -696,8 +697,10 @@ again:

if (!spin_trylock(&dentry->d_lock)) {
again1:
- spin_unlock(&dcache_lru_lock);
- goto again;
+ spin_unlock(&sbz->s_dentry_lru_lock);
+ cpu_relax();
+ spin_lock(&sbz->s_dentry_lru_lock);
+ continue;
}
/*
* We found an inuse dentry which was not removed from
@@ -705,7 +708,7 @@ again1:
* it - just keep it off the LRU list.
*/
if (dentry->d_count) {
- __dentry_lru_del_init(dentry);
+ __dentry_lru_del_init(sbz, dentry);
spin_unlock(&dentry->d_lock);
continue;
}
@@ -722,21 +725,33 @@ again2:
goto again2;
}
}
- __dentry_lru_del_init(dentry);
- spin_unlock(&dcache_lru_lock);
+ __dentry_lru_del_init(sbz, dentry);
+ spin_unlock(&sbz->s_dentry_lru_lock);

prune_one_dentry(dentry);
+ cond_resched();
/* dentry->d_lock dropped */
- spin_lock(&dcache_lru_lock);
+ spin_lock(&sbz->s_dentry_lru_lock);
}

- if (count == NULL && !list_empty(&sb->s_dentry_lru))
+ if (count == NULL && !list_empty(&sbz->s_dentry_lru))
goto restart;
if (count != NULL)
*count = cnt;
if (!list_empty(&referenced))
- list_splice(&referenced, &sb->s_dentry_lru);
- spin_unlock(&dcache_lru_lock);
+ list_splice(&referenced, &sbz->s_dentry_lru);
+}
+
+static void __shrink_dcache_sb(struct super_block *sb, unsigned long *count, int flags)
+{
+ struct zone *zone;
+ for_each_zone(zone) {
+ struct sb_zoneinfo *sbz = sb_zone_info(sb, zone);
+
+ spin_lock(&sbz->s_dentry_lru_lock);
+ __shrink_dcache_sb_zone(sb, sbz, count, flags);
+ spin_unlock(&sbz->s_dentry_lru_lock);
+ }
}

/**
@@ -749,31 +764,29 @@ again2:
* This function may fail to free any resources if all the dentries are in use.
*/
static void prune_dcache(struct zone *zone, unsigned long scanned,
- unsigned long total, gfp_t gfp_mask)
-
+ unsigned long total, gfp_t gfp_mask)
{
- unsigned long nr_to_scan;
struct super_block *sb, *n;
- int w_count;
- int prune_ratio;
- int count, pruned;

- shrinker_add_scan(&nr_to_scan, scanned, total, dentry_stat.nr_unused,
- DEFAULT_SEEKS * sysctl_vfs_cache_pressure / 100);
-done:
- count = shrinker_do_scan(&nr_to_scan, SHRINK_BATCH);
- if (dentry_stat.nr_unused == 0 || count == 0)
- return;
- if (count >= dentry_stat.nr_unused)
- prune_ratio = 1;
- else
- prune_ratio = dentry_stat.nr_unused / count;
spin_lock(&sb_lock);
list_for_each_entry_safe(sb, n, &super_blocks, s_list) {
+ struct sb_zoneinfo *sbz = sb_zone_info(sb, zone);
+ unsigned long nr;
+
if (list_empty(&sb->s_instances))
continue;
- if (sb->s_nr_dentry_unused == 0)
+ if (sbz->s_nr_dentry_unused == 0)
+ continue;
+
+ shrinker_add_scan(&sbz->s_nr_dentry_scan, scanned, total,
+ sbz->s_nr_dentry_unused,
+ DEFAULT_SEEKS * sysctl_vfs_cache_pressure / 100);
+ if (!(gfp_mask & __GFP_FS))
+ continue;
+ nr = ACCESS_ONCE(sbz->s_nr_dentry_scan);
+ if (nr < SHRINK_BATCH)
continue;
+
sb->s_count++;
/* Now, we reclaim unused dentrins with fairness.
* We reclaim them same percentage from each superblock.
@@ -785,11 +798,8 @@ done:
* number of dentries in the machine)
*/
spin_unlock(&sb_lock);
- if (prune_ratio != 1)
- w_count = (sb->s_nr_dentry_unused / prune_ratio) + 1;
- else
- w_count = sb->s_nr_dentry_unused;
- pruned = w_count;
+
+
/*
* We need to be sure this filesystem isn't being unmounted,
* otherwise we could race with generic_shutdown_super(), and
@@ -798,28 +808,24 @@ done:
* s_root isn't NULL.
*/
if (down_read_trylock(&sb->s_umount)) {
- if ((sb->s_root != NULL) &&
- (!list_empty(&sb->s_dentry_lru))) {
- __shrink_dcache_sb(sb, &w_count,
- DCACHE_REFERENCED);
- pruned -= w_count;
+ spin_lock(&sbz->s_dentry_lru_lock);
+ if (sb->s_root != NULL &&
+ !list_empty(&sbz->s_dentry_lru)) {
+ count_vm_events(SLABS_SCANNED, nr);
+ sbz->s_nr_dentry_scan = 0;
+ __shrink_dcache_sb_zone(sb, sbz,
+ &nr, DCACHE_REFERENCED);
+ sbz->s_nr_dentry_scan += nr;
}
+ spin_unlock(&sbz->s_dentry_lru_lock);
up_read(&sb->s_umount);
}
spin_lock(&sb_lock);
/* lock was dropped, must reset next */
list_safe_reset_next(sb, n, s_list);
- count -= pruned;
__put_super(sb);
- /* more work left to do? */
- if (count <= 0)
- break;
}
spin_unlock(&sb_lock);
- if (count <= 0) {
- cond_resched();
- goto done;
- }
}

/**
@@ -1167,8 +1173,9 @@ out:
void shrink_dcache_parent(struct dentry * parent)
{
struct super_block *sb = parent->d_sb;
- int found;
+ unsigned long found;

+ /* doesn't work well anymore :( */
while ((found = select_parent(parent)) != 0)
__shrink_dcache_sb(sb, &found, 0);
}
@@ -1189,7 +1196,7 @@ EXPORT_SYMBOL(shrink_dcache_parent);
static int shrink_dcache_memory(struct zone *zone, unsigned long scanned,
unsigned long total, unsigned long global, gfp_t gfp_mask)
{
- prune_dcache(zone, scanned, global, gfp_mask);
+ prune_dcache(zone, scanned, total, gfp_mask);
return 0;
}

Index: linux-2.6/fs/inode.c
===================================================================
--- linux-2.6.orig/fs/inode.c
+++ linux-2.6/fs/inode.c
@@ -35,7 +35,7 @@
* s_inodes, i_sb_list
* inode_hash_bucket lock protects:
* inode hash table, i_hash
- * inode_lru_lock protects:
+ * zone->inode_lru_lock protects:
* inode_lru, i_lru
* wb->b_lock protects:
* b_io, b_more_io, b_dirty, i_io, i_lru
@@ -51,7 +51,7 @@
* inode_lock
* inode->i_lock
* inode_list_lglock
- * inode_lru_lock
+ * zone->inode_lru_lock
* wb->b_lock
* inode_hash_bucket lock
*/
@@ -102,8 +102,6 @@ static unsigned int i_hash_shift __read_
* allowing for low-overhead inode sync() operations.
*/

-static LIST_HEAD(inode_lru);
-
struct inode_hash_bucket {
struct hlist_bl_head head;
};
@@ -129,8 +127,6 @@ static struct inode_hash_bucket *inode_h
DECLARE_LGLOCK(inode_list_lglock);
DEFINE_LGLOCK(inode_list_lglock);

-static DEFINE_SPINLOCK(inode_lru_lock);
-
/*
* iprune_sem provides exclusion between the kswapd or try_to_free_pages
* icache shrinking path, and the umount path. Without this exclusion,
@@ -428,18 +424,22 @@ static void dispose_list(struct list_hea

void __inode_lru_list_add(struct inode *inode)
{
- spin_lock(&inode_lru_lock);
- list_add(&inode->i_lru, &inode_lru);
- inodes_stat.nr_unused++;
- spin_unlock(&inode_lru_lock);
+ struct zone *z = page_zone(virt_to_page(inode));
+
+ spin_lock(&z->inode_lru_lock);
+ list_add(&inode->i_lru, &z->inode_lru);
+ z->inode_nr_lru++;
+ spin_unlock(&z->inode_lru_lock);
}

void __inode_lru_list_del(struct inode *inode)
{
- spin_lock(&inode_lru_lock);
+ struct zone *z = page_zone(virt_to_page(inode));
+
+ spin_lock(&z->inode_lru_lock);
list_del_init(&inode->i_lru);
- inodes_stat.nr_unused--;
- spin_unlock(&inode_lru_lock);
+ z->inode_nr_lru--;
+ spin_unlock(&z->inode_lru_lock);
}

/*
@@ -464,10 +464,7 @@ static int invalidate_sb_inodes(struct s
list_del_init(&inode->i_io);
spin_unlock(&wb->b_lock);

- spin_lock(&inode_lru_lock);
- list_del(&inode->i_lru);
- inodes_stat.nr_unused--;
- spin_unlock(&inode_lru_lock);
+ __inode_lru_list_del(inode);

WARN_ON(inode->i_state & I_NEW);
inode->i_state |= I_FREEING;
@@ -534,55 +531,58 @@ static void prune_icache(struct zone *zo

down_read(&iprune_sem);
again:
- spin_lock(&inode_lru_lock);
+ spin_lock(&zone->inode_lru_lock);
for (; nr_to_scan; nr_to_scan--) {
struct inode *inode;

- if (list_empty(&inode_lru))
+ if (list_empty(&zone->inode_lru))
break;

- inode = list_entry(inode_lru.prev, struct inode, i_lru);
+ inode = list_entry(zone->inode_lru.prev, struct inode, i_lru);

if (!spin_trylock(&inode->i_lock)) {
- spin_unlock(&inode_lru_lock);
+ spin_unlock(&zone->inode_lru_lock);
+ cpu_relax();
goto again;
}
if (inode->i_count || (inode->i_state & ~I_REFERENCED)) {
list_del_init(&inode->i_lru);
spin_unlock(&inode->i_lock);
- inodes_stat.nr_unused--;
+ zone->inode_nr_lru--;
continue;
}
if (inode->i_state) {
- list_move(&inode->i_lru, &inode_lru);
+ list_move(&inode->i_lru, &zone->inode_lru);
inode->i_state &= ~I_REFERENCED;
spin_unlock(&inode->i_lock);
continue;
}
if (inode_has_buffers(inode) || inode->i_data.nrpages) {
- list_move(&inode->i_lru, &inode_lru);
- spin_unlock(&inode_lru_lock);
+ list_move(&inode->i_lru, &zone->inode_lru);
+ spin_unlock(&zone->inode_lru_lock);
__iget(inode);
spin_unlock(&inode->i_lock);

+ dispose_list(&freeable);
+
if (remove_inode_buffers(inode))
reap += invalidate_mapping_pages(&inode->i_data,
0, -1);
iput(inode);
- spin_lock(&inode_lru_lock);
+ spin_lock(&zone->inode_lru_lock);
continue;
}
list_move(&inode->i_lru, &freeable);
WARN_ON(inode->i_state & I_NEW);
inode->i_state |= I_FREEING;
spin_unlock(&inode->i_lock);
- inodes_stat.nr_unused--;
+ zone->inode_nr_lru--;
}
if (current_is_kswapd())
__count_vm_events(KSWAPD_INODESTEAL, reap);
else
__count_vm_events(PGINODESTEAL, reap);
- spin_unlock(&inode_lru_lock);
+ spin_unlock(&zone->inode_lru_lock);

dispose_list(&freeable);
up_read(&iprune_sem);
@@ -600,19 +600,24 @@ again:
static int shrink_icache_memory(struct zone *zone, unsigned long scanned,
unsigned long total, unsigned long global, gfp_t gfp_mask)
{
- static unsigned long nr_to_scan;
unsigned long nr;

- shrinker_add_scan(&nr_to_scan, scanned, global,
- inodes_stat.nr_unused,
+ shrinker_add_scan(&zone->inode_nr_scan, scanned, total,
+ zone->inode_nr_lru,
DEFAULT_SEEKS * sysctl_vfs_cache_pressure / 100);
+ /*
+ * Nasty deadlock avoidance. We may hold various FS locks,
+ * and we don't want to recurse into the FS that called us
+ * in clear_inode() and friends..
+ */
if (!(gfp_mask & __GFP_FS))
- return 0;
+ return 0;

- while ((nr = shrinker_do_scan(&nr_to_scan, SHRINK_BATCH))) {
- prune_icache(zone, nr);
- cond_resched();
- }
+ nr = ACCESS_ONCE(zone->inode_nr_scan);
+ if (nr < SHRINK_BATCH)
+ return 0;
+ zone->inode_nr_scan = 0;
+ prune_icache(zone, nr);

return 0;
}
@@ -1431,12 +1436,8 @@ void generic_delete_inode(struct inode *
{
const struct super_operations *op = inode->i_sb->s_op;

- if (!list_empty(&inode->i_lru)) {
- spin_lock(&inode_lru_lock);
- list_del_init(&inode->i_lru);
- inodes_stat.nr_unused--;
- spin_unlock(&inode_lru_lock);
- }
+ if (!list_empty(&inode->i_lru))
+ __inode_lru_list_del(inode);
if (!list_empty(&inode->i_io)) {
struct bdi_writeback *wb = inode_to_wb(inode);
spin_lock(&wb->b_lock);
@@ -1493,10 +1494,7 @@ int generic_detach_inode(struct inode *i
inode->i_state |= I_REFERENCED;
if (!(inode->i_state & (I_DIRTY|I_SYNC)) &&
list_empty(&inode->i_lru)) {
- spin_lock(&inode_lru_lock);
- list_add(&inode->i_lru, &inode_lru);
- inodes_stat.nr_unused++;
- spin_unlock(&inode_lru_lock);
+ __inode_lru_list_add(inode);
}
spin_unlock(&inode->i_lock);
return 0;
@@ -1510,12 +1508,8 @@ int generic_detach_inode(struct inode *i
inode->i_state &= ~I_WILL_FREE;
__remove_inode_hash(inode);
}
- if (!list_empty(&inode->i_lru)) {
- spin_lock(&inode_lru_lock);
- list_del_init(&inode->i_lru);
- inodes_stat.nr_unused--;
- spin_unlock(&inode_lru_lock);
- }
+ if (!list_empty(&inode->i_lru))
+ __inode_lru_list_del(inode);
if (!list_empty(&inode->i_io)) {
struct bdi_writeback *wb = inode_to_wb(inode);
spin_lock(&wb->b_lock);
@@ -1831,6 +1825,7 @@ void __init inode_init_early(void)
void __init inode_init(void)
{
int loop;
+ struct zone *zone;

percpu_counter_init(&nr_inodes, 0);
/* inode slab cache */
@@ -1840,6 +1835,12 @@ void __init inode_init(void)
(SLAB_RECLAIM_ACCOUNT|SLAB_PANIC|
SLAB_MEM_SPREAD),
init_once);
+ for_each_zone(zone) {
+ spin_lock_init(&zone->inode_lru_lock);
+ INIT_LIST_HEAD(&zone->inode_lru);
+ zone->inode_nr_lru = 0;
+ zone->inode_nr_scan = 0;
+ }
register_shrinker(&icache_shrinker);

lg_lock_init(inode_list_lglock);
Index: linux-2.6/fs/super.c
===================================================================
--- linux-2.6.orig/fs/super.c
+++ linux-2.6/fs/super.c
@@ -50,6 +50,8 @@ static struct super_block *alloc_super(s
static const struct super_operations default_op;

if (s) {
+ struct zone *zone;
+
if (security_sb_alloc(s)) {
kfree(s);
s = NULL;
@@ -88,7 +90,6 @@ static struct super_block *alloc_super(s
#endif
INIT_LIST_HEAD(&s->s_instances);
INIT_HLIST_BL_HEAD(&s->s_anon);
- INIT_LIST_HEAD(&s->s_dentry_lru);
init_rwsem(&s->s_umount);
mutex_init(&s->s_lock);
lockdep_set_class(&s->s_umount, &type->s_umount_key);
@@ -125,6 +126,15 @@ static struct super_block *alloc_super(s
s->s_maxbytes = MAX_NON_LFS;
s->s_op = &default_op;
s->s_time_gran = 1000000000;
+
+ for_each_zone(zone) {
+ struct sb_zoneinfo *sbz = sb_zone_info(s, zone);
+
+ spin_lock_init(&sbz->s_dentry_lru_lock);
+ INIT_LIST_HEAD(&sbz->s_dentry_lru);
+ sbz->s_nr_dentry_scan = 0;
+ sbz->s_nr_dentry_unused = 0;
+ }
}
out:
return s;
Index: linux-2.6/include/linux/mmzone.h
===================================================================
--- linux-2.6.orig/include/linux/mmzone.h
+++ linux-2.6/include/linux/mmzone.h
@@ -370,6 +370,13 @@ struct zone {

ZONE_PADDING(_pad2_)
+
+ spinlock_t inode_lru_lock;
+ struct list_head inode_lru;
+ unsigned long inode_nr_lru;
+ unsigned long inode_nr_scan;
+
+ ZONE_PADDING(_pad3_)
/* Rarely used or read-mostly fields */

/*
Index: linux-2.6/include/linux/mm.h
===================================================================
--- linux-2.6.orig/include/linux/mm.h
+++ linux-2.6/include/linux/mm.h
@@ -1004,7 +1004,8 @@ struct shrinker {
/* These are for internal use */
struct list_head list;
};
-#define DEFAULT_SEEKS (128UL*2) /* A good number if you don't know better. */
+#define SHRINK_FIXED (128UL) /* Fixed point for shrinker ratio */
+#define DEFAULT_SEEKS (SHRINK_FIXED*2) /* A good number if you don't know better. */
#define SHRINK_BATCH 128 /* A good number if you don't know better */
extern void register_shrinker(struct shrinker *);
extern void unregister_shrinker(struct shrinker *);