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mm: clean up and kernelify shrinker registration

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I can never remember what the function to register to receive VM pressure
is called.  I have to trace down from __alloc_pages() to find it.

It's called "set_shrinker()", and it needs Your Help.

1) Don't hide struct shrinker.  It contains no magic.
2) Don't allocate "struct shrinker".  It's not helpful.
3) Call them "register_shrinker" and "unregister_shrinker".
4) Call the function "shrink" not "shrinker".
5) Reduce the 17 lines of waffly comments to 13, but document it properly.

Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
Cc: David Chinner <dgc@sgi.com>
Cc: Trond Myklebust <trond.myklebust@fys.uio.no>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Rusty Russell
2007-07-17 04:03:17 -07:00
committed by Linus Torvalds
parent 5ad333eb66
commit 8e1f936b73
10 changed files with 81 additions and 74 deletions
Download Patch File Download Diff File Expand all files Collapse all files

7
fs/dcache.c
View File

@@ -883,6 +883,11 @@ static int shrink_dcache_memory(int nr, gfp_t gfp_mask)
return (dentry_stat.nr_unused / 100) * sysctl_vfs_cache_pressure;
}
static struct shrinker dcache_shrinker = {
.shrink = shrink_dcache_memory,
.seeks = DEFAULT_SEEKS,
};
/**
* d_alloc - allocate a dcache entry
* @parent: parent of entry to allocate
@@ -2115,7 +2120,7 @@ static void __init dcache_init(unsigned long mempages)
dentry_cache = KMEM_CACHE(dentry,
SLAB_RECLAIM_ACCOUNT|SLAB_PANIC|SLAB_MEM_SPREAD);
set_shrinker(DEFAULT_SEEKS, shrink_dcache_memory);
register_shrinker(&dcache_shrinker);
/* Hash may have been set up in dcache_init_early */
if (!hashdist)

7
fs/dquot.c
View File

@@ -538,6 +538,11 @@ static int shrink_dqcache_memory(int nr, gfp_t gfp_mask)
return (dqstats.free_dquots / 100) * sysctl_vfs_cache_pressure;
}
static struct shrinker dqcache_shrinker = {
.shrink = shrink_dqcache_memory,
.seeks = DEFAULT_SEEKS,
};
/*
* Put reference to dquot
* NOTE: If you change this function please check whether dqput_blocks() works right...
@@ -1870,7 +1875,7 @@ static int __init dquot_init(void)
printk("Dquot-cache hash table entries: %ld (order %ld, %ld bytes)\n",
nr_hash, order, (PAGE_SIZE << order));
set_shrinker(DEFAULT_SEEKS, shrink_dqcache_memory);
register_shrinker(&dqcache_shrinker);
return 0;
}

7
fs/inode.c
View File

@@ -462,6 +462,11 @@ static int shrink_icache_memory(int nr, gfp_t gfp_mask)
return (inodes_stat.nr_unused / 100) * sysctl_vfs_cache_pressure;
}
static struct shrinker icache_shrinker = {
.shrink = shrink_icache_memory,
.seeks = DEFAULT_SEEKS,
};
static void __wait_on_freeing_inode(struct inode *inode);
/*
* Called with the inode lock held.
@@ -1385,7 +1390,7 @@ void __init inode_init(unsigned long mempages)
SLAB_MEM_SPREAD),
init_once,
NULL);
set_shrinker(DEFAULT_SEEKS, shrink_icache_memory);
register_shrinker(&icache_shrinker);
/* Hash may have been set up in inode_init_early */
if (!hashdist)

9
fs/mbcache.c
View File

@@ -100,7 +100,6 @@ struct mb_cache {
static LIST_HEAD(mb_cache_list);
static LIST_HEAD(mb_cache_lru_list);
static DEFINE_SPINLOCK(mb_cache_spinlock);
static struct shrinker *mb_shrinker;
static inline int
mb_cache_indexes(struct mb_cache *cache)
@@ -118,6 +117,10 @@ mb_cache_indexes(struct mb_cache *cache)
static int mb_cache_shrink_fn(int nr_to_scan, gfp_t gfp_mask);
static struct shrinker mb_cache_shrinker = {
.shrink = mb_cache_shrink_fn,
.seeks = DEFAULT_SEEKS,
};
static inline int
__mb_cache_entry_is_hashed(struct mb_cache_entry *ce)
@@ -662,13 +665,13 @@ mb_cache_entry_find_next(struct mb_cache_entry *prev, int index,
static int __init init_mbcache(void)
{
mb_shrinker = set_shrinker(DEFAULT_SEEKS, mb_cache_shrink_fn);
register_shrinker(&mb_cache_shrinker);
return 0;
}
static void __exit exit_mbcache(void)
{
remove_shrinker(mb_shrinker);
unregister_shrinker(&mb_cache_shrinker);
}
module_init(init_mbcache)

10
fs/nfs/super.c
View File

@@ -300,7 +300,10 @@ static const struct super_operations nfs4_sops = {
};
#endif
static struct shrinker *acl_shrinker;
static struct shrinker acl_shrinker = {
.shrink = nfs_access_cache_shrinker,
.seeks = DEFAULT_SEEKS,
};
/*
* Register the NFS filesystems
@@ -321,7 +324,7 @@ int __init register_nfs_fs(void)
if (ret < 0)
goto error_2;
#endif
acl_shrinker = set_shrinker(DEFAULT_SEEKS, nfs_access_cache_shrinker);
register_shrinker(&acl_shrinker);
return 0;
#ifdef CONFIG_NFS_V4
@@ -339,8 +342,7 @@ error_0:
*/
void __exit unregister_nfs_fs(void)
{
if (acl_shrinker != NULL)
remove_shrinker(acl_shrinker);
unregister_shrinker(&acl_shrinker);
#ifdef CONFIG_NFS_V4
unregister_filesystem(&nfs4_fs_type);
nfs_unregister_sysctl();

14
fs/xfs/linux-2.6/xfs_buf.c
View File

@@ -35,10 +35,13 @@
#include <linux/freezer.h>
static kmem_zone_t *xfs_buf_zone;
static struct shrinker *xfs_buf_shake;
STATIC int xfsbufd(void *);
STATIC int xfsbufd_wakeup(int, gfp_t);
STATIC void xfs_buf_delwri_queue(xfs_buf_t *, int);
static struct shrinker xfs_buf_shake = {
.shrink = xfsbufd_wakeup,
.seeks = DEFAULT_SEEKS,
};
static struct workqueue_struct *xfslogd_workqueue;
struct workqueue_struct *xfsdatad_workqueue;
@@ -1832,14 +1835,9 @@ xfs_buf_init(void)
if (!xfsdatad_workqueue)
goto out_destroy_xfslogd_workqueue;
xfs_buf_shake = set_shrinker(DEFAULT_SEEKS, xfsbufd_wakeup);
if (!xfs_buf_shake)
goto out_destroy_xfsdatad_workqueue;
register_shrinker(&xfs_buf_shake);
return 0;
out_destroy_xfsdatad_workqueue:
destroy_workqueue(xfsdatad_workqueue);
out_destroy_xfslogd_workqueue:
destroy_workqueue(xfslogd_workqueue);
out_free_buf_zone:
@@ -1854,7 +1852,7 @@ xfs_buf_init(void)
void
xfs_buf_terminate(void)
{
remove_shrinker(xfs_buf_shake);
unregister_shrinker(&xfs_buf_shake);
destroy_workqueue(xfsdatad_workqueue);
destroy_workqueue(xfslogd_workqueue);
kmem_zone_destroy(xfs_buf_zone);

10
fs/xfs/quota/xfs_qm.c
View File

@@ -62,7 +62,6 @@ uint ndquot;
kmem_zone_t *qm_dqzone;
kmem_zone_t *qm_dqtrxzone;
static struct shrinker *xfs_qm_shaker;
static cred_t xfs_zerocr;
@@ -78,6 +77,11 @@ STATIC int xfs_qm_init_quotainos(xfs_mount_t *);
STATIC int xfs_qm_init_quotainfo(xfs_mount_t *);
STATIC int xfs_qm_shake(int, gfp_t);
static struct shrinker xfs_qm_shaker = {
.shrink = xfs_qm_shake,
.seeks = DEFAULT_SEEKS,
};
#ifdef DEBUG
extern mutex_t qcheck_lock;
#endif
@@ -149,7 +153,7 @@ xfs_Gqm_init(void)
} else
xqm->qm_dqzone = qm_dqzone;
xfs_qm_shaker = set_shrinker(DEFAULT_SEEKS, xfs_qm_shake);
register_shrinker(&xfs_qm_shaker);
/*
* The t_dqinfo portion of transactions.
@@ -181,7 +185,7 @@ xfs_qm_destroy(
ASSERT(xqm != NULL);
ASSERT(xqm->qm_nrefs == 0);
remove_shrinker(xfs_qm_shaker);
unregister_shrinker(&xfs_qm_shaker);
hsize = xqm->qm_dqhashmask + 1;
for (i = 0; i < hsize; i++) {
xfs_qm_list_destroy(&(xqm->qm_usr_dqhtable[i]));