fs: convert inode and dentry shrinking to be node aware

Now that the shrinker is passing a node in the scan control structure, we
can pass this to the the generic LRU list code to isolate reclaim to the
lists on matching nodes.

Signed-off-by: Dave Chinner <dchinner@redhat.com>
Signed-off-by: Glauber Costa <glommer@parallels.com>
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>

fs/dcache.c

@@ -937,6 +937,7 @@ dentry_lru_isolate(struct list_head *item, spinlock_t *lru_lock, void *arg)
  * prune_dcache_sb - shrink the dcache
  * @sb: superblock
  * @nr_to_scan : number of entries to try to free
+ * @nid: which node to scan for freeable entities
  *
  * Attempt to shrink the superblock dcache LRU by @nr_to_scan entries. This is
  * done when we need more memory an called from the superblock shrinker
@@ -945,13 +946,14 @@ dentry_lru_isolate(struct list_head *item, spinlock_t *lru_lock, void *arg)
  * This function may fail to free any resources if all the dentries are in
  * use.
  */
-long prune_dcache_sb(struct super_block *sb, unsigned long nr_to_scan)
+long prune_dcache_sb(struct super_block *sb, unsigned long nr_to_scan,
+		     int nid)
 {
 	LIST_HEAD(dispose);
 	long freed;
 
-	freed = list_lru_walk(&sb->s_dentry_lru, dentry_lru_isolate,
-			      &dispose, nr_to_scan);
+	freed = list_lru_walk_node(&sb->s_dentry_lru, nid, dentry_lru_isolate,
+				       &dispose, &nr_to_scan);
 	shrink_dentry_list(&dispose);
 	return freed;
 }

fs/inode.c

@@ -748,13 +748,14 @@ inode_lru_isolate(struct list_head *item, spinlock_t *lru_lock, void *arg)
  * to trim from the LRU. Inodes to be freed are moved to a temporary list and
  * then are freed outside inode_lock by dispose_list().
  */
-long prune_icache_sb(struct super_block *sb, unsigned long nr_to_scan)
+long prune_icache_sb(struct super_block *sb, unsigned long nr_to_scan,
+		     int nid)
 {
 	LIST_HEAD(freeable);
 	long freed;
 
-	freed = list_lru_walk(&sb->s_inode_lru, inode_lru_isolate,
-						&freeable, nr_to_scan);
+	freed = list_lru_walk_node(&sb->s_inode_lru, nid, inode_lru_isolate,
+				       &freeable, &nr_to_scan);
 	dispose_list(&freeable);
 	return freed;
 }

fs/internal.h

@@ -114,7 +114,8 @@ 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 long prune_icache_sb(struct super_block *sb, unsigned long nr_to_scan,
+			    int nid);
 extern void inode_add_lru(struct inode *inode);
 
 /*
@@ -131,7 +132,8 @@ 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);
+extern long prune_dcache_sb(struct super_block *sb, unsigned long nr_to_scan,
+			    int nid);
 
 /*
  * read_write.c

fs/super.c

@@ -76,10 +76,10 @@ static unsigned long super_cache_scan(struct shrinker *shrink,
 		return SHRINK_STOP;
 
 	if (sb->s_op->nr_cached_objects)
-		fs_objects = sb->s_op->nr_cached_objects(sb);
+		fs_objects = sb->s_op->nr_cached_objects(sb, sc->nid);
 
-	inodes = list_lru_count(&sb->s_inode_lru);
-	dentries = list_lru_count(&sb->s_dentry_lru);
+	inodes = list_lru_count_node(&sb->s_inode_lru, sc->nid);
+	dentries = list_lru_count_node(&sb->s_dentry_lru, sc->nid);
 	total_objects = dentries + inodes + fs_objects + 1;
 
 	/* proportion the scan between the caches */
@@ -90,13 +90,14 @@ static unsigned long super_cache_scan(struct shrinker *shrink,
 	 * prune the dcache first as the icache is pinned by it, then
 	 * prune the icache, followed by the filesystem specific caches
 	 */
-	freed = prune_dcache_sb(sb, dentries);
-	freed += prune_icache_sb(sb, inodes);
+	freed = prune_dcache_sb(sb, dentries, sc->nid);
+	freed += prune_icache_sb(sb, inodes, sc->nid);
 
 	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);
+		freed += sb->s_op->free_cached_objects(sb, fs_objects,
+						       sc->nid);
 	}
 
 	drop_super(sb);
@@ -115,10 +116,13 @@ static unsigned long super_cache_count(struct shrinker *shrink,
 		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_op->nr_cached_objects(sb,
+						 sc->nid);
 
-	total_objects += list_lru_count(&sb->s_dentry_lru);
-	total_objects += list_lru_count(&sb->s_inode_lru);
+	total_objects += list_lru_count_node(&sb->s_dentry_lru,
+						 sc->nid);
+	total_objects += list_lru_count_node(&sb->s_inode_lru,
+						 sc->nid);
 
 	total_objects = vfs_pressure_ratio(total_objects);
 	drop_super(sb);
@@ -228,6 +232,7 @@ static struct super_block *alloc_super(struct file_system_type *type, int flags)
 		s->s_shrink.scan_objects = super_cache_scan;
 		s->s_shrink.count_objects = super_cache_count;
 		s->s_shrink.batch = 1024;
+		s->s_shrink.flags = SHRINKER_NUMA_AWARE;
 	}
 out:
 	return s;

fs/xfs/xfs_super.c

@@ -1537,7 +1537,8 @@ xfs_fs_mount(
 
 static long
 xfs_fs_nr_cached_objects(
-	struct super_block	*sb)
+	struct super_block	*sb,
+	int			nid)
 {
 	return xfs_reclaim_inodes_count(XFS_M(sb));
 }
@@ -1545,7 +1546,8 @@ xfs_fs_nr_cached_objects(
 static long
 xfs_fs_free_cached_objects(
 	struct super_block	*sb,
-	long			nr_to_scan)
+	long			nr_to_scan,
+	int			nid)
 {
 	return xfs_reclaim_inodes_nr(XFS_M(sb), nr_to_scan);
 }

include/linux/fs.h

@@ -1624,8 +1624,8 @@ 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);
-	long (*nr_cached_objects)(struct super_block *);
-	long (*free_cached_objects)(struct super_block *, long);
+	long (*nr_cached_objects)(struct super_block *, int);
+	long (*free_cached_objects)(struct super_block *, long, int);
 };
 
 /*