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Date: Wed, 28 Nov 2012 10:14:38 +1100
From: Dave Chinner <david@...morbit.com>
To: glommer@...allels.com
Cc: linux-kernel@...r.kernel.org, linux-fsdevel@...r.kernel.org,
linux-mm@...ck.org, xfs@....sgi.com
Subject: [PATCH 11/19] fs: convert inode and dentry shrinking to be node aware
From: Dave Chinner <dchinner@...hat.com>
Now that the shrinker is passing a nodemask 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.
This requires a small amount of refactoring of the LRU list API,
which might be best split out into a separate patch.
Signed-off-by: Dave Chinner <dchinner@...hat.com>
---
fs/dcache.c | 7 ++++---
fs/inode.c | 7 ++++---
fs/internal.h | 6 ++++--
fs/super.c | 22 +++++++++++++---------
fs/xfs/xfs_super.c | 6 ++++--
include/linux/fs.h | 4 ++--
include/linux/list_lru.h | 19 ++++++++++++++++---
lib/list_lru.c | 18 ++++++++++--------
8 files changed, 57 insertions(+), 32 deletions(-)
diff --git a/fs/dcache.c b/fs/dcache.c
index d72e388..7f107fb 100644
--- a/fs/dcache.c
+++ b/fs/dcache.c
@@ -907,13 +907,14 @@ static int dentry_lru_isolate(struct list_head *item, spinlock_t *lru_lock,
* This function may fail to free any resources if all the dentries are in
* use.
*/
-long prune_dcache_sb(struct super_block *sb, long nr_to_scan)
+long prune_dcache_sb(struct super_block *sb, long nr_to_scan,
+ nodemask_t *nodes_to_walk)
{
LIST_HEAD(dispose);
long freed;
- freed = list_lru_walk(&sb->s_dentry_lru, dentry_lru_isolate,
- &dispose, nr_to_scan);
+ freed = list_lru_walk_nodemask(&sb->s_dentry_lru, dentry_lru_isolate,
+ &dispose, nr_to_scan, nodes_to_walk);
shrink_dentry_list(&dispose);
return freed;
}
diff --git a/fs/inode.c b/fs/inode.c
index 2662305..3857f9f 100644
--- a/fs/inode.c
+++ b/fs/inode.c
@@ -731,13 +731,14 @@ static int inode_lru_isolate(struct list_head *item, spinlock_t *lru_lock,
* 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, long nr_to_scan)
+long prune_icache_sb(struct super_block *sb, long nr_to_scan,
+ nodemask_t *nodes_to_walk)
{
LIST_HEAD(freeable);
long freed;
- freed = list_lru_walk(&sb->s_inode_lru, inode_lru_isolate,
- &freeable, nr_to_scan);
+ freed = list_lru_walk_nodemask(&sb->s_inode_lru, inode_lru_isolate,
+ &freeable, nr_to_scan, nodes_to_walk);
dispose_list(&freeable);
return freed;
}
diff --git a/fs/internal.h b/fs/internal.h
index 7d7908b..95c4e9b 100644
--- a/fs/internal.h
+++ b/fs/internal.h
@@ -110,7 +110,8 @@ 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, long nr_to_scan);
+extern long prune_icache_sb(struct super_block *sb, long nr_to_scan,
+ nodemask_t *nodes_to_scan);
/*
@@ -126,4 +127,5 @@ extern int invalidate_inodes(struct super_block *, bool);
* dcache.c
*/
extern struct dentry *__d_alloc(struct super_block *, const struct qstr *);
-extern long prune_dcache_sb(struct super_block *sb, long nr_to_scan);
+extern long prune_dcache_sb(struct super_block *sb, long nr_to_scan,
+ nodemask_t *nodes_to_scan);
diff --git a/fs/super.c b/fs/super.c
index b1d24ef..3c975b1 100644
--- a/fs/super.c
+++ b/fs/super.c
@@ -75,10 +75,10 @@ static long super_cache_scan(struct shrinker *shrink, struct shrink_control *sc)
return -1;
if (sb->s_op && 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->nodes_to_scan);
- inodes = list_lru_count(&sb->s_inode_lru);
- dentries = list_lru_count(&sb->s_dentry_lru);
+ inodes = list_lru_count_nodemask(&sb->s_inode_lru, &sc->nodes_to_scan);
+ dentries = list_lru_count_nodemask(&sb->s_dentry_lru, &sc->nodes_to_scan);
total_objects = dentries + inodes + fs_objects + 1;
/* proportion the scan between the caches */
@@ -89,12 +89,13 @@ static long super_cache_scan(struct shrinker *shrink, struct shrink_control *sc)
* 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->nodes_to_scan);
+ freed += prune_icache_sb(sb, inodes, &sc->nodes_to_scan);
if (fs_objects) {
fs_objects = (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->nodes_to_scan);
}
drop_super(sb);
@@ -112,10 +113,13 @@ static long super_cache_count(struct shrinker *shrink, struct shrink_control *sc
return -1;
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->nodes_to_scan);
- total_objects += list_lru_count(&sb->s_dentry_lru);
- total_objects += list_lru_count(&sb->s_inode_lru);
+ total_objects += list_lru_count_nodemask(&sb->s_dentry_lru,
+ &sc->nodes_to_scan);
+ total_objects += list_lru_count_nodemask(&sb->s_inode_lru,
+ &sc->nodes_to_scan);
total_objects = (total_objects / 100) * sysctl_vfs_cache_pressure;
drop_super(sb);
diff --git a/fs/xfs/xfs_super.c b/fs/xfs/xfs_super.c
index 00aa61d..33d67d5 100644
--- a/fs/xfs/xfs_super.c
+++ b/fs/xfs/xfs_super.c
@@ -1516,7 +1516,8 @@ xfs_fs_mount(
static long
xfs_fs_nr_cached_objects(
- struct super_block *sb)
+ struct super_block *sb,
+ nodemask_t *nodes_to_count)
{
return xfs_reclaim_inodes_count(XFS_M(sb));
}
@@ -1524,7 +1525,8 @@ xfs_fs_nr_cached_objects(
static long
xfs_fs_free_cached_objects(
struct super_block *sb,
- long nr_to_scan)
+ long nr_to_scan,
+ nodemask_t *nodes_to_scan)
{
return xfs_reclaim_inodes_nr(XFS_M(sb), nr_to_scan);
}
diff --git a/include/linux/fs.h b/include/linux/fs.h
index befa46f..fda4ee2 100644
--- a/include/linux/fs.h
+++ b/include/linux/fs.h
@@ -1614,8 +1614,8 @@ 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 *, nodemask_t *);
+ long (*free_cached_objects)(struct super_block *, long, nodemask_t *);
};
/*
diff --git a/include/linux/list_lru.h b/include/linux/list_lru.h
index b0e3ba2..02796da 100644
--- a/include/linux/list_lru.h
+++ b/include/linux/list_lru.h
@@ -24,14 +24,27 @@ struct list_lru {
int list_lru_init(struct list_lru *lru);
int list_lru_add(struct list_lru *lru, struct list_head *item);
int list_lru_del(struct list_lru *lru, struct list_head *item);
-long list_lru_count(struct list_lru *lru);
+long list_lru_count_nodemask(struct list_lru *lru, nodemask_t *nodes_to_count);
+
+static inline long list_lru_count(struct list_lru *lru)
+{
+ return list_lru_count_nodemask(lru, &lru->active_nodes);
+}
+
typedef int (*list_lru_walk_cb)(struct list_head *item, spinlock_t *lock,
void *cb_arg);
typedef void (*list_lru_dispose_cb)(struct list_head *dispose_list);
-long list_lru_walk(struct list_lru *lru, list_lru_walk_cb isolate,
- void *cb_arg, long nr_to_walk);
+long list_lru_walk_nodemask(struct list_lru *lru, list_lru_walk_cb isolate,
+ void *cb_arg, long nr_to_walk, nodemask_t *nodes_to_walk);
+
+static inline long list_lru_walk(struct list_lru *lru, list_lru_walk_cb isolate,
+ void *cb_arg, long nr_to_walk)
+{
+ return list_lru_walk_nodemask(lru, isolate, cb_arg, nr_to_walk,
+ &lru->active_nodes);
+}
long list_lru_dispose_all(struct list_lru *lru, list_lru_dispose_cb dispose);
diff --git a/lib/list_lru.c b/lib/list_lru.c
index 881e342..0f08ed6 100644
--- a/lib/list_lru.c
+++ b/lib/list_lru.c
@@ -54,13 +54,14 @@ list_lru_del(
EXPORT_SYMBOL_GPL(list_lru_del);
long
-list_lru_count(
- struct list_lru *lru)
+list_lru_count_nodemask(
+ struct list_lru *lru,
+ nodemask_t *nodes_to_count)
{
long count = 0;
int nid;
- for_each_node_mask(nid, lru->active_nodes) {
+ for_each_node_mask(nid, *nodes_to_count) {
struct list_lru_node *nlru = &lru->node[nid];
spin_lock(&nlru->lock);
@@ -71,7 +72,7 @@ list_lru_count(
return count;
}
-EXPORT_SYMBOL_GPL(list_lru_count);
+EXPORT_SYMBOL_GPL(list_lru_count_nodemask);
static long
list_lru_walk_node(
@@ -116,16 +117,17 @@ restart:
}
long
-list_lru_walk(
+list_lru_walk_nodemask(
struct list_lru *lru,
list_lru_walk_cb isolate,
void *cb_arg,
- long nr_to_walk)
+ long nr_to_walk,
+ nodemask_t *nodes_to_walk)
{
long isolated = 0;
int nid;
- for_each_node_mask(nid, lru->active_nodes) {
+ for_each_node_mask(nid, *nodes_to_walk) {
isolated += list_lru_walk_node(lru, nid, isolate,
cb_arg, &nr_to_walk);
if (nr_to_walk <= 0)
@@ -133,7 +135,7 @@ list_lru_walk(
}
return isolated;
}
-EXPORT_SYMBOL_GPL(list_lru_walk);
+EXPORT_SYMBOL_GPL(list_lru_walk_nodemask);
long
list_lru_dispose_all_node(
--
1.7.10
--
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