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shrinker: convert superblock shrinkers to new API 

Convert superblock shrinker to use the new count/scan API, and propagate
the API changes through to the filesystem callouts.  The filesystem
callouts already use a count/scan API, so it's just changing counters to
longs to match the VM API.

This requires the dentry and inode shrinker callouts to be converted to
the count/scan API.  This is mainly a mechanical change.

[glommer@openvz.org: use mult_frac for fractional proportions, build fixes]
Signed-off-by: Dave Chinner <dchinner@redhat.com>
Signed-off-by: Glauber Costa <glommer@openvz.org>
Acked-by: Mel Gorman <mgorman@suse.de>
Cc: "Theodore Ts'o" <tytso@mit.edu>
Cc: Adrian Hunter <adrian.hunter@intel.com>
Cc: Al Viro <viro@zeniv.linux.org.uk>
Cc: Artem Bityutskiy <artem.bityutskiy@linux.intel.com>
Cc: Arve Hjønnevåg <arve@android.com>
Cc: Carlos Maiolino <cmaiolino@redhat.com>
Cc: Christoph Hellwig <hch@lst.de>
Cc: Chuck Lever <chuck.lever@oracle.com>
Cc: Daniel Vetter <daniel.vetter@ffwll.ch>
Cc: David Rientjes <rientjes@google.com>
Cc: Gleb Natapov <gleb@redhat.com>
Cc: Greg Thelen <gthelen@google.com>
Cc: J. Bruce Fields <bfields@redhat.com>
Cc: Jan Kara <jack@suse.cz>
Cc: Jerome Glisse <jglisse@redhat.com>
Cc: John Stultz <john.stultz@linaro.org>
Cc: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
Cc: Kent Overstreet <koverstreet@google.com>
Cc: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
Cc: Marcelo Tosatti <mtosatti@redhat.com>
Cc: Mel Gorman <mgorman@suse.de>
Cc: Steven Whitehouse <swhiteho@redhat.com>
Cc: Thomas Hellstrom <thellstrom@vmware.com>
Cc: Trond Myklebust <Trond.Myklebust@netapp.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
This commit is contained in:
Dave Chinner 2013-08-28 10:17:57 +10:00 committed by Al Viro
parent 24f7c6b981
commit 0a234c6dcb
8 changed files with 69 additions and 47 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

7
fs/dcache.c
View File

@ -913,11 +913,12 @@ static void shrink_dentry_list(struct list_head *list)
* This function may fail to free any resources if all the dentries are in
* use.
*/
void prune_dcache_sb(struct super_block *sb, int count)
long prune_dcache_sb(struct super_block *sb, unsigned long nr_to_scan)
{
struct dentry *dentry;
LIST_HEAD(referenced);
LIST_HEAD(tmp);
long freed = 0;
relock:
spin_lock(&sb->s_dentry_lru_lock);
@ -942,7 +943,8 @@ relock:
this_cpu_dec(nr_dentry_unused);
sb->s_nr_dentry_unused--;
spin_unlock(&dentry->d_lock);
if (!--count)
freed++;
if (!--nr_to_scan)
break;
}
cond_resched_lock(&sb->s_dentry_lru_lock);
@ -952,6 +954,7 @@ relock:
spin_unlock(&sb->s_dentry_lru_lock);
shrink_dentry_list(&tmp);
return freed;
}
/*

7
fs/inode.c
View File

@ -706,10 +706,11 @@ static int can_unuse(struct inode *inode)
* LRU does not have strict ordering. Hence we don't want to reclaim inodes
* with this flag set because they are the inodes that are out of order.
*/
void prune_icache_sb(struct super_block *sb, int nr_to_scan)
long prune_icache_sb(struct super_block *sb, unsigned long nr_to_scan)
{
LIST_HEAD(freeable);
int nr_scanned;
long nr_scanned;
long freed = 0;
unsigned long reap = 0;
spin_lock(&sb->s_inode_lru_lock);
@ -779,6 +780,7 @@ void prune_icache_sb(struct super_block *sb, int nr_to_scan)
list_move(&inode->i_lru, &freeable);
sb->s_nr_inodes_unused--;
this_cpu_dec(nr_unused);
freed++;
}
if (current_is_kswapd())
__count_vm_events(KSWAPD_INODESTEAL, reap);
@ -789,6 +791,7 @@ void prune_icache_sb(struct super_block *sb, int nr_to_scan)
current->reclaim_state->reclaimed_slab += reap;
dispose_list(&freeable);
return freed;
}
static void __wait_on_freeing_inode(struct inode *inode);

2
fs/internal.h
View File

@ -114,6 +114,7 @@ extern int open_check_o_direct(struct file *f);
* inode.c
*/
extern spinlock_t inode_sb_list_lock;
extern long prune_icache_sb(struct super_block *sb, unsigned long nr_to_scan);
extern void inode_add_lru(struct inode *inode);
/*
@ -130,6 +131,7 @@ extern int invalidate_inodes(struct super_block *, bool);
*/
extern struct dentry *__d_alloc(struct super_block *, const struct qstr *);
extern int d_set_mounted(struct dentry *dentry);
extern long prune_dcache_sb(struct super_block *sb, unsigned long nr_to_scan);
/*
* read_write.c

62
fs/super.c
View File

@ -53,11 +53,15 @@ static char *sb_writers_name[SB_FREEZE_LEVELS] = {
* shrinker path and that leads to deadlock on the shrinker_rwsem. Hence we
* take a passive reference to the superblock to avoid this from occurring.
*/
static int prune_super(struct shrinker *shrink, struct shrink_control *sc)
static unsigned long super_cache_scan(struct shrinker *shrink,
struct shrink_control *sc)
{
struct super_block *sb;
int fs_objects = 0;
int total_objects;
long fs_objects = 0;
long total_objects;
long freed = 0;
long dentries;
long inodes;
sb = container_of(shrink, struct super_block, s_shrink);
@ -65,11 +69,11 @@ static int prune_super(struct shrinker *shrink, struct shrink_control *sc)
* 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 (sc->nr_to_scan && !(sc->gfp_mask & __GFP_FS))
return -1;
if (!(sc->gfp_mask & __GFP_FS))
return SHRINK_STOP;
if (!grab_super_passive(sb))
return -1;
return SHRINK_STOP;
if (sb->s_op->nr_cached_objects)
fs_objects = sb->s_op->nr_cached_objects(sb);
@ -77,33 +81,46 @@ static int prune_super(struct shrinker *shrink, struct shrink_control *sc)
total_objects = sb->s_nr_dentry_unused +
sb->s_nr_inodes_unused + fs_objects + 1;
if (sc->nr_to_scan) {
int dentries;
int inodes;
/* proportion the scan between the caches */
dentries = mult_frac(sc->nr_to_scan, sb->s_nr_dentry_unused,
total_objects);
inodes = mult_frac(sc->nr_to_scan, sb->s_nr_inodes_unused,
total_objects);
if (fs_objects)
fs_objects = mult_frac(sc->nr_to_scan, fs_objects,
total_objects);
/*
* prune the dcache first as the icache is pinned by it, then
* prune the icache, followed by the filesystem specific caches
*/
prune_dcache_sb(sb, dentries);
prune_icache_sb(sb, inodes);
freed = prune_dcache_sb(sb, dentries);
freed += prune_icache_sb(sb, inodes);
if (fs_objects && sb->s_op->free_cached_objects) {
sb->s_op->free_cached_objects(sb, fs_objects);
fs_objects = sb->s_op->nr_cached_objects(sb);
}
total_objects = sb->s_nr_dentry_unused +
sb->s_nr_inodes_unused + fs_objects;
if (fs_objects) {
fs_objects = mult_frac(sc->nr_to_scan, fs_objects,
total_objects);
freed += sb->s_op->free_cached_objects(sb, fs_objects);
}
drop_super(sb);
return freed;
}
static unsigned long super_cache_count(struct shrinker *shrink,
struct shrink_control *sc)
{
struct super_block *sb;
long total_objects = 0;
sb = container_of(shrink, struct super_block, s_shrink);
if (!grab_super_passive(sb))
return 0;
if (sb->s_op && sb->s_op->nr_cached_objects)
total_objects = sb->s_op->nr_cached_objects(sb);
total_objects += sb->s_nr_dentry_unused;
total_objects += sb->s_nr_inodes_unused;
total_objects = vfs_pressure_ratio(total_objects);
drop_super(sb);
return total_objects;
@ -211,7 +228,8 @@ static struct super_block *alloc_super(struct file_system_type *type, int flags)
s->cleancache_poolid = -1;
s->s_shrink.seeks = DEFAULT_SEEKS;
s->s_shrink.shrink = prune_super;
s->s_shrink.scan_objects = super_cache_scan;
s->s_shrink.count_objects = super_cache_count;
s->s_shrink.batch = 1024;
}
out:

4
fs/xfs/xfs_icache.c
View File

@ -1167,7 +1167,7 @@ xfs_reclaim_inodes(
* them to be cleaned, which we hope will not be very long due to the
* background walker having already kicked the IO off on those dirty inodes.
*/
void
long
xfs_reclaim_inodes_nr(
struct xfs_mount *mp,
int nr_to_scan)
@ -1176,7 +1176,7 @@ xfs_reclaim_inodes_nr(
xfs_reclaim_work_queue(mp);
xfs_ail_push_all(mp->m_ail);
xfs_reclaim_inodes_ag(mp, SYNC_TRYLOCK | SYNC_WAIT, &nr_to_scan);
return xfs_reclaim_inodes_ag(mp, SYNC_TRYLOCK | SYNC_WAIT, &nr_to_scan);
}
/*

2
fs/xfs/xfs_icache.h
View File

@ -46,7 +46,7 @@ void xfs_reclaim_worker(struct work_struct *work);
int xfs_reclaim_inodes(struct xfs_mount *mp, int mode);
int xfs_reclaim_inodes_count(struct xfs_mount *mp);
void xfs_reclaim_inodes_nr(struct xfs_mount *mp, int nr_to_scan);
long xfs_reclaim_inodes_nr(struct xfs_mount *mp, int nr_to_scan);
void xfs_inode_set_reclaim_tag(struct xfs_inode *ip);

8
fs/xfs/xfs_super.c
View File

@ -1535,19 +1535,19 @@ xfs_fs_mount(
return mount_bdev(fs_type, flags, dev_name, data, xfs_fs_fill_super);
}
static int
static long
xfs_fs_nr_cached_objects(
struct super_block *sb)
{
return xfs_reclaim_inodes_count(XFS_M(sb));
}
static void
static long
xfs_fs_free_cached_objects(
struct super_block *sb,
int nr_to_scan)
long nr_to_scan)
{
xfs_reclaim_inodes_nr(XFS_M(sb), nr_to_scan);
return xfs_reclaim_inodes_nr(XFS_M(sb), nr_to_scan);
}
static const struct super_operations xfs_super_operations = {

8
include/linux/fs.h
View File

@ -1335,10 +1335,6 @@ struct super_block {
struct workqueue_struct *s_dio_done_wq;
};
/* superblock cache pruning functions */
extern void prune_icache_sb(struct super_block *sb, int nr_to_scan);
extern void prune_dcache_sb(struct super_block *sb, int nr_to_scan);
extern struct timespec current_fs_time(struct super_block *sb);
/*
@ -1631,8 +1627,8 @@ struct super_operations {
ssize_t (*quota_write)(struct super_block *, int, const char *, size_t, loff_t);
#endif
int (*bdev_try_to_free_page)(struct super_block*, struct page*, gfp_t);
int (*nr_cached_objects)(struct super_block *);
void (*free_cached_objects)(struct super_block *, int);
long (*nr_cached_objects)(struct super_block *);
long (*free_cached_objects)(struct super_block *, long);
};
/*