vmscan: change shrinker API by passing shrink_control struct
Change each shrinker's API by consolidating the existing parameters into
shrink_control struct. This will simplify any further features added w/o
touching each file of shrinker.
[akpm@linux-foundation.org: fix build]
[akpm@linux-foundation.org: fix warning]
[kosaki.motohiro@jp.fujitsu.com: fix up new shrinker API]
[akpm@linux-foundation.org: fix xfs warning]
[akpm@linux-foundation.org: update gfs2]
Signed-off-by: Ying Han <yinghan@google.com>
Cc: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>
Cc: Minchan Kim <minchan.kim@gmail.com>
Acked-by: Pavel Emelyanov <xemul@openvz.org>
Cc: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
Cc: Mel Gorman <mel@csn.ul.ie>
Acked-by: Rik van Riel <riel@redhat.com>
Cc: Johannes Weiner <hannes@cmpxchg.org>
Cc: Hugh Dickins <hughd@google.com>
Cc: Dave Hansen <dave@linux.vnet.ibm.com>
Cc: Steven Whitehouse <swhiteho@redhat.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
diff --git a/arch/x86/kvm/mmu.c b/arch/x86/kvm/mmu.c
index 2841805..bd14bb4 100644
--- a/arch/x86/kvm/mmu.c
+++ b/arch/x86/kvm/mmu.c
@@ -3545,10 +3545,11 @@
return kvm_mmu_prepare_zap_page(kvm, page, invalid_list);
}
-static int mmu_shrink(struct shrinker *shrink, int nr_to_scan, gfp_t gfp_mask)
+static int mmu_shrink(struct shrinker *shrink, struct shrink_control *sc)
{
struct kvm *kvm;
struct kvm *kvm_freed = NULL;
+ int nr_to_scan = sc->nr_to_scan;
if (nr_to_scan == 0)
goto out;
diff --git a/drivers/gpu/drm/i915/i915_gem.c b/drivers/gpu/drm/i915/i915_gem.c
index c628903..0b2e167 100644
--- a/drivers/gpu/drm/i915/i915_gem.c
+++ b/drivers/gpu/drm/i915/i915_gem.c
@@ -56,9 +56,7 @@
static void i915_gem_free_object_tail(struct drm_i915_gem_object *obj);
static int i915_gem_inactive_shrink(struct shrinker *shrinker,
- int nr_to_scan,
- gfp_t gfp_mask);
-
+ struct shrink_control *sc);
/* some bookkeeping */
static void i915_gem_info_add_obj(struct drm_i915_private *dev_priv,
@@ -4092,9 +4090,7 @@
}
static int
-i915_gem_inactive_shrink(struct shrinker *shrinker,
- int nr_to_scan,
- gfp_t gfp_mask)
+i915_gem_inactive_shrink(struct shrinker *shrinker, struct shrink_control *sc)
{
struct drm_i915_private *dev_priv =
container_of(shrinker,
@@ -4102,6 +4098,7 @@
mm.inactive_shrinker);
struct drm_device *dev = dev_priv->dev;
struct drm_i915_gem_object *obj, *next;
+ int nr_to_scan = sc->nr_to_scan;
int cnt;
if (!mutex_trylock(&dev->struct_mutex))
diff --git a/drivers/gpu/drm/ttm/ttm_page_alloc.c b/drivers/gpu/drm/ttm/ttm_page_alloc.c
index 9d9d929..d948575 100644
--- a/drivers/gpu/drm/ttm/ttm_page_alloc.c
+++ b/drivers/gpu/drm/ttm/ttm_page_alloc.c
@@ -395,12 +395,14 @@
/**
* Callback for mm to request pool to reduce number of page held.
*/
-static int ttm_pool_mm_shrink(struct shrinker *shrink, int shrink_pages, gfp_t gfp_mask)
+static int ttm_pool_mm_shrink(struct shrinker *shrink,
+ struct shrink_control *sc)
{
static atomic_t start_pool = ATOMIC_INIT(0);
unsigned i;
unsigned pool_offset = atomic_add_return(1, &start_pool);
struct ttm_page_pool *pool;
+ int shrink_pages = sc->nr_to_scan;
pool_offset = pool_offset % NUM_POOLS;
/* select start pool in round robin fashion */
diff --git a/drivers/staging/zcache/zcache.c b/drivers/staging/zcache/zcache.c
index b8a2b30..77ac2d4 100644
--- a/drivers/staging/zcache/zcache.c
+++ b/drivers/staging/zcache/zcache.c
@@ -1181,9 +1181,12 @@
/*
* zcache shrinker interface (only useful for ephemeral pages, so zbud only)
*/
-static int shrink_zcache_memory(struct shrinker *shrink, int nr, gfp_t gfp_mask)
+static int shrink_zcache_memory(struct shrinker *shrink,
+ struct shrink_control *sc)
{
int ret = -1;
+ int nr = sc->nr_to_scan;
+ gfp_t gfp_mask = sc->gfp_mask;
if (nr >= 0) {
if (!(gfp_mask & __GFP_FS))
diff --git a/fs/dcache.c b/fs/dcache.c
index 18b2a1f..37f72ee 100644
--- a/fs/dcache.c
+++ b/fs/dcache.c
@@ -1220,7 +1220,7 @@
EXPORT_SYMBOL(shrink_dcache_parent);
/*
- * Scan `nr' dentries and return the number which remain.
+ * Scan `sc->nr_slab_to_reclaim' dentries and return the number which remain.
*
* We need to avoid reentering the filesystem if the caller is performing a
* GFP_NOFS allocation attempt. One example deadlock is:
@@ -1231,8 +1231,12 @@
*
* In this case we return -1 to tell the caller that we baled.
*/
-static int shrink_dcache_memory(struct shrinker *shrink, int nr, gfp_t gfp_mask)
+static int shrink_dcache_memory(struct shrinker *shrink,
+ struct shrink_control *sc)
{
+ int nr = sc->nr_to_scan;
+ gfp_t gfp_mask = sc->gfp_mask;
+
if (nr) {
if (!(gfp_mask & __GFP_FS))
return -1;
diff --git a/fs/drop_caches.c b/fs/drop_caches.c
index 440999c..c00e055 100644
--- a/fs/drop_caches.c
+++ b/fs/drop_caches.c
@@ -42,11 +42,10 @@
int nr_objects;
struct shrink_control shrink = {
.gfp_mask = GFP_KERNEL,
- .nr_scanned = 1000,
};
do {
- nr_objects = shrink_slab(&shrink, 1000);
+ nr_objects = shrink_slab(&shrink, 1000, 1000);
} while (nr_objects > 10);
}
diff --git a/fs/gfs2/glock.c b/fs/gfs2/glock.c
index a2a6abb..2792a79 100644
--- a/fs/gfs2/glock.c
+++ b/fs/gfs2/glock.c
@@ -1346,11 +1346,14 @@
}
-static int gfs2_shrink_glock_memory(struct shrinker *shrink, int nr, gfp_t gfp_mask)
+static int gfs2_shrink_glock_memory(struct shrinker *shrink,
+ struct shrink_control *sc)
{
struct gfs2_glock *gl;
int may_demote;
int nr_skipped = 0;
+ int nr = sc->nr_to_scan;
+ gfp_t gfp_mask = sc->gfp_mask;
LIST_HEAD(skipped);
if (nr == 0)
diff --git a/fs/gfs2/quota.c b/fs/gfs2/quota.c
index e23d986..42e8d23 100644
--- a/fs/gfs2/quota.c
+++ b/fs/gfs2/quota.c
@@ -38,6 +38,7 @@
#include <linux/sched.h>
#include <linux/slab.h>
+#include <linux/mm.h>
#include <linux/spinlock.h>
#include <linux/completion.h>
#include <linux/buffer_head.h>
@@ -77,19 +78,20 @@
static atomic_t qd_lru_count = ATOMIC_INIT(0);
static DEFINE_SPINLOCK(qd_lru_lock);
-int gfs2_shrink_qd_memory(struct shrinker *shrink, int nr, gfp_t gfp_mask)
+int gfs2_shrink_qd_memory(struct shrinker *shrink, struct shrink_control *sc)
{
struct gfs2_quota_data *qd;
struct gfs2_sbd *sdp;
+ int nr_to_scan = sc->nr_to_scan;
- if (nr == 0)
+ if (nr_to_scan == 0)
goto out;
- if (!(gfp_mask & __GFP_FS))
+ if (!(sc->gfp_mask & __GFP_FS))
return -1;
spin_lock(&qd_lru_lock);
- while (nr && !list_empty(&qd_lru_list)) {
+ while (nr_to_scan && !list_empty(&qd_lru_list)) {
qd = list_entry(qd_lru_list.next,
struct gfs2_quota_data, qd_reclaim);
sdp = qd->qd_gl->gl_sbd;
@@ -110,7 +112,7 @@
spin_unlock(&qd_lru_lock);
kmem_cache_free(gfs2_quotad_cachep, qd);
spin_lock(&qd_lru_lock);
- nr--;
+ nr_to_scan--;
}
spin_unlock(&qd_lru_lock);
diff --git a/fs/gfs2/quota.h b/fs/gfs2/quota.h
index e7d236c..90bf1c3 100644
--- a/fs/gfs2/quota.h
+++ b/fs/gfs2/quota.h
@@ -12,6 +12,7 @@
struct gfs2_inode;
struct gfs2_sbd;
+struct shrink_control;
#define NO_QUOTA_CHANGE ((u32)-1)
@@ -51,7 +52,8 @@
return ret;
}
-extern int gfs2_shrink_qd_memory(struct shrinker *shrink, int nr, gfp_t gfp_mask);
+extern int gfs2_shrink_qd_memory(struct shrinker *shrink,
+ struct shrink_control *sc);
extern const struct quotactl_ops gfs2_quotactl_ops;
#endif /* __QUOTA_DOT_H__ */
diff --git a/fs/inode.c b/fs/inode.c
index 88aa3bcc..990d284 100644
--- a/fs/inode.c
+++ b/fs/inode.c
@@ -751,8 +751,12 @@
* This function is passed the number of inodes to scan, and it returns the
* total number of remaining possibly-reclaimable inodes.
*/
-static int shrink_icache_memory(struct shrinker *shrink, int nr, gfp_t gfp_mask)
+static int shrink_icache_memory(struct shrinker *shrink,
+ struct shrink_control *sc)
{
+ int nr = sc->nr_to_scan;
+ gfp_t gfp_mask = sc->gfp_mask;
+
if (nr) {
/*
* Nasty deadlock avoidance. We may hold various FS locks,
diff --git a/fs/mbcache.c b/fs/mbcache.c
index 2f174be..8c32ef3 100644
--- a/fs/mbcache.c
+++ b/fs/mbcache.c
@@ -90,7 +90,8 @@
* What the mbcache registers as to get shrunk dynamically.
*/
-static int mb_cache_shrink_fn(struct shrinker *shrink, int nr_to_scan, gfp_t gfp_mask);
+static int mb_cache_shrink_fn(struct shrinker *shrink,
+ struct shrink_control *sc);
static struct shrinker mb_cache_shrinker = {
.shrink = mb_cache_shrink_fn,
@@ -156,18 +157,19 @@
* gets low.
*
* @shrink: (ignored)
- * @nr_to_scan: Number of objects to scan
- * @gfp_mask: (ignored)
+ * @sc: shrink_control passed from reclaim
*
* Returns the number of objects which are present in the cache.
*/
static int
-mb_cache_shrink_fn(struct shrinker *shrink, int nr_to_scan, gfp_t gfp_mask)
+mb_cache_shrink_fn(struct shrinker *shrink, struct shrink_control *sc)
{
LIST_HEAD(free_list);
struct mb_cache *cache;
struct mb_cache_entry *entry, *tmp;
int count = 0;
+ int nr_to_scan = sc->nr_to_scan;
+ gfp_t gfp_mask = sc->gfp_mask;
mb_debug("trying to free %d entries", nr_to_scan);
spin_lock(&mb_cache_spinlock);
diff --git a/fs/nfs/dir.c b/fs/nfs/dir.c
index 7237672..424e477 100644
--- a/fs/nfs/dir.c
+++ b/fs/nfs/dir.c
@@ -2042,11 +2042,14 @@
}
}
-int nfs_access_cache_shrinker(struct shrinker *shrink, int nr_to_scan, gfp_t gfp_mask)
+int nfs_access_cache_shrinker(struct shrinker *shrink,
+ struct shrink_control *sc)
{
LIST_HEAD(head);
struct nfs_inode *nfsi, *next;
struct nfs_access_entry *cache;
+ int nr_to_scan = sc->nr_to_scan;
+ gfp_t gfp_mask = sc->gfp_mask;
if ((gfp_mask & GFP_KERNEL) != GFP_KERNEL)
return (nr_to_scan == 0) ? 0 : -1;
diff --git a/fs/nfs/internal.h b/fs/nfs/internal.h
index ce118ce..2df6ca7 100644
--- a/fs/nfs/internal.h
+++ b/fs/nfs/internal.h
@@ -234,7 +234,7 @@
/* dir.c */
extern int nfs_access_cache_shrinker(struct shrinker *shrink,
- int nr_to_scan, gfp_t gfp_mask);
+ struct shrink_control *sc);
/* inode.c */
extern struct workqueue_struct *nfsiod_workqueue;
diff --git a/fs/quota/dquot.c b/fs/quota/dquot.c
index d3c032f..5b572c8 100644
--- a/fs/quota/dquot.c
+++ b/fs/quota/dquot.c
@@ -691,8 +691,11 @@
* This is called from kswapd when we think we need some
* more memory
*/
-static int shrink_dqcache_memory(struct shrinker *shrink, int nr, gfp_t gfp_mask)
+static int shrink_dqcache_memory(struct shrinker *shrink,
+ struct shrink_control *sc)
{
+ int nr = sc->nr_to_scan;
+
if (nr) {
spin_lock(&dq_list_lock);
prune_dqcache(nr);
diff --git a/fs/xfs/linux-2.6/xfs_buf.c b/fs/xfs/linux-2.6/xfs_buf.c
index 52b2b5d..5e68099 100644
--- a/fs/xfs/linux-2.6/xfs_buf.c
+++ b/fs/xfs/linux-2.6/xfs_buf.c
@@ -1422,12 +1422,12 @@
int
xfs_buftarg_shrink(
struct shrinker *shrink,
- int nr_to_scan,
- gfp_t mask)
+ struct shrink_control *sc)
{
struct xfs_buftarg *btp = container_of(shrink,
struct xfs_buftarg, bt_shrinker);
struct xfs_buf *bp;
+ int nr_to_scan = sc->nr_to_scan;
LIST_HEAD(dispose);
if (!nr_to_scan)
diff --git a/fs/xfs/linux-2.6/xfs_sync.c b/fs/xfs/linux-2.6/xfs_sync.c
index cb1bb20..8ecad5f 100644
--- a/fs/xfs/linux-2.6/xfs_sync.c
+++ b/fs/xfs/linux-2.6/xfs_sync.c
@@ -1032,13 +1032,14 @@
static int
xfs_reclaim_inode_shrink(
struct shrinker *shrink,
- int nr_to_scan,
- gfp_t gfp_mask)
+ struct shrink_control *sc)
{
struct xfs_mount *mp;
struct xfs_perag *pag;
xfs_agnumber_t ag;
int reclaimable;
+ int nr_to_scan = sc->nr_to_scan;
+ gfp_t gfp_mask = sc->gfp_mask;
mp = container_of(shrink, struct xfs_mount, m_inode_shrink);
if (nr_to_scan) {
diff --git a/fs/xfs/quota/xfs_qm.c b/fs/xfs/quota/xfs_qm.c
index 69228aa..b94dace 100644
--- a/fs/xfs/quota/xfs_qm.c
+++ b/fs/xfs/quota/xfs_qm.c
@@ -60,7 +60,7 @@
STATIC int xfs_qm_init_quotainos(xfs_mount_t *);
STATIC int xfs_qm_init_quotainfo(xfs_mount_t *);
-STATIC int xfs_qm_shake(struct shrinker *, int, gfp_t);
+STATIC int xfs_qm_shake(struct shrinker *, struct shrink_control *);
static struct shrinker xfs_qm_shaker = {
.shrink = xfs_qm_shake,
@@ -2009,10 +2009,10 @@
STATIC int
xfs_qm_shake(
struct shrinker *shrink,
- int nr_to_scan,
- gfp_t gfp_mask)
+ struct shrink_control *sc)
{
int ndqused, nfree, n;
+ gfp_t gfp_mask = sc->gfp_mask;
if (!kmem_shake_allow(gfp_mask))
return 0;
diff --git a/include/linux/mm.h b/include/linux/mm.h
index 32cfa96..5cbbf78 100644
--- a/include/linux/mm.h
+++ b/include/linux/mm.h
@@ -1166,18 +1166,20 @@
* We consolidate the values for easier extention later.
*/
struct shrink_control {
- unsigned long nr_scanned;
gfp_t gfp_mask;
+
+ /* How many slab objects shrinker() should scan and try to reclaim */
+ unsigned long nr_to_scan;
};
/*
* A callback you can register to apply pressure to ageable caches.
*
- * 'shrink' is passed a count 'nr_to_scan' and a 'gfpmask'. It should
- * look through the least-recently-used 'nr_to_scan' entries and
- * attempt to free them up. It should return the number of objects
- * which remain in the cache. If it returns -1, it means it cannot do
- * any scanning at this time (eg. there is a risk of deadlock).
+ * 'sc' is passed shrink_control which includes a count 'nr_to_scan'
+ * and a 'gfpmask'. It should look through the least-recently-used
+ * 'nr_to_scan' entries and attempt to free them up. It should return
+ * the number of objects which remain in the cache. If it returns -1, it means
+ * it cannot do any scanning at this time (eg. there is a risk of deadlock).
*
* The 'gfpmask' refers to the allocation we are currently trying to
* fulfil.
@@ -1186,7 +1188,7 @@
* querying the cache size, so a fastpath for that case is appropriate.
*/
struct shrinker {
- int (*shrink)(struct shrinker *, int nr_to_scan, gfp_t gfp_mask);
+ int (*shrink)(struct shrinker *, struct shrink_control *sc);
int seeks; /* seeks to recreate an obj */
/* These are for internal use */
@@ -1640,7 +1642,8 @@
int drop_caches_sysctl_handler(struct ctl_table *, int,
void __user *, size_t *, loff_t *);
unsigned long shrink_slab(struct shrink_control *shrink,
- unsigned long lru_pages);
+ unsigned long nr_pages_scanned,
+ unsigned long lru_pages);
#ifndef CONFIG_MMU
#define randomize_va_space 0
diff --git a/mm/memory-failure.c b/mm/memory-failure.c
index 341341b..5c8f7e0 100644
--- a/mm/memory-failure.c
+++ b/mm/memory-failure.c
@@ -241,10 +241,9 @@
do {
struct shrink_control shrink = {
.gfp_mask = GFP_KERNEL,
- .nr_scanned = 1000,
};
- nr = shrink_slab(&shrink, 1000);
+ nr = shrink_slab(&shrink, 1000, 1000);
if (page_count(p) == 1)
break;
} while (nr > 10);
diff --git a/mm/vmscan.c b/mm/vmscan.c
index e4e245e..7e01161 100644
--- a/mm/vmscan.c
+++ b/mm/vmscan.c
@@ -202,6 +202,14 @@
}
EXPORT_SYMBOL(unregister_shrinker);
+static inline int do_shrinker_shrink(struct shrinker *shrinker,
+ struct shrink_control *sc,
+ unsigned long nr_to_scan)
+{
+ sc->nr_to_scan = nr_to_scan;
+ return (*shrinker->shrink)(shrinker, sc);
+}
+
#define SHRINK_BATCH 128
/*
* Call the shrink functions to age shrinkable caches
@@ -223,15 +231,14 @@
* Returns the number of slab objects which we shrunk.
*/
unsigned long shrink_slab(struct shrink_control *shrink,
+ unsigned long nr_pages_scanned,
unsigned long lru_pages)
{
struct shrinker *shrinker;
unsigned long ret = 0;
- unsigned long scanned = shrink->nr_scanned;
- gfp_t gfp_mask = shrink->gfp_mask;
- if (scanned == 0)
- scanned = SWAP_CLUSTER_MAX;
+ if (nr_pages_scanned == 0)
+ nr_pages_scanned = SWAP_CLUSTER_MAX;
if (!down_read_trylock(&shrinker_rwsem)) {
/* Assume we'll be able to shrink next time */
@@ -244,8 +251,8 @@
unsigned long total_scan;
unsigned long max_pass;
- max_pass = (*shrinker->shrink)(shrinker, 0, gfp_mask);
- delta = (4 * scanned) / shrinker->seeks;
+ max_pass = do_shrinker_shrink(shrinker, shrink, 0);
+ delta = (4 * nr_pages_scanned) / shrinker->seeks;
delta *= max_pass;
do_div(delta, lru_pages + 1);
shrinker->nr += delta;
@@ -272,9 +279,9 @@
int shrink_ret;
int nr_before;
- nr_before = (*shrinker->shrink)(shrinker, 0, gfp_mask);
- shrink_ret = (*shrinker->shrink)(shrinker, this_scan,
- gfp_mask);
+ nr_before = do_shrinker_shrink(shrinker, shrink, 0);
+ shrink_ret = do_shrinker_shrink(shrinker, shrink,
+ this_scan);
if (shrink_ret == -1)
break;
if (shrink_ret < nr_before)
@@ -2072,8 +2079,7 @@
lru_pages += zone_reclaimable_pages(zone);
}
- shrink->nr_scanned = sc->nr_scanned;
- shrink_slab(shrink, lru_pages);
+ shrink_slab(shrink, sc->nr_scanned, lru_pages);
if (reclaim_state) {
sc->nr_reclaimed += reclaim_state->reclaimed_slab;
reclaim_state->reclaimed_slab = 0;
@@ -2456,8 +2462,7 @@
end_zone, 0))
shrink_zone(priority, zone, &sc);
reclaim_state->reclaimed_slab = 0;
- shrink.nr_scanned = sc.nr_scanned;
- nr_slab = shrink_slab(&shrink, lru_pages);
+ nr_slab = shrink_slab(&shrink, sc.nr_scanned, lru_pages);
sc.nr_reclaimed += reclaim_state->reclaimed_slab;
total_scanned += sc.nr_scanned;
@@ -3025,7 +3030,6 @@
}
nr_slab_pages0 = zone_page_state(zone, NR_SLAB_RECLAIMABLE);
- shrink.nr_scanned = sc.nr_scanned;
if (nr_slab_pages0 > zone->min_slab_pages) {
/*
* shrink_slab() does not currently allow us to determine how
@@ -3041,7 +3045,7 @@
unsigned long lru_pages = zone_reclaimable_pages(zone);
/* No reclaimable slab or very low memory pressure */
- if (!shrink_slab(&shrink, lru_pages))
+ if (!shrink_slab(&shrink, sc.nr_scanned, lru_pages))
break;
/* Freed enough memory */
diff --git a/net/sunrpc/auth.c b/net/sunrpc/auth.c
index 67e3127..cd6e4aa 100644
--- a/net/sunrpc/auth.c
+++ b/net/sunrpc/auth.c
@@ -326,10 +326,12 @@
* Run memory cache shrinker.
*/
static int
-rpcauth_cache_shrinker(struct shrinker *shrink, int nr_to_scan, gfp_t gfp_mask)
+rpcauth_cache_shrinker(struct shrinker *shrink, struct shrink_control *sc)
{
LIST_HEAD(free);
int res;
+ int nr_to_scan = sc->nr_to_scan;
+ gfp_t gfp_mask = sc->gfp_mask;
if ((gfp_mask & GFP_KERNEL) != GFP_KERNEL)
return (nr_to_scan == 0) ? 0 : -1;
