The patch changes each shrinkers API by consolidating the existing
parameters into shrink_control struct. This will simplify any further
features added w/o touching each file of shrinker.
changelog v2..v1:
1. replace the scan_control to shrink_control, and only pass the set
of values down to the shrinker.
Signed-off-by: Ying Han <yinghan@xxxxxxxxxx>
---
arch/x86/kvm/mmu.c | 3 ++-
drivers/gpu/drm/i915/i915_gem.c | 5 ++---
drivers/gpu/drm/ttm/ttm_page_alloc.c | 4 +++-
drivers/staging/zcache/zcache.c | 5 ++++-
fs/dcache.c | 8 ++++++--
fs/gfs2/glock.c | 5 ++++-
fs/inode.c | 6 +++++-
fs/mbcache.c | 10 ++++++----
fs/nfs/dir.c | 5 ++++-
fs/nfs/internal.h | 2 +-
fs/quota/dquot.c | 5 ++++-
fs/xfs/linux-2.6/xfs_buf.c | 4 ++--
fs/xfs/linux-2.6/xfs_sync.c | 5 +++--
fs/xfs/quota/xfs_qm.c | 7 ++++---
include/linux/mm.h | 15 +++++++++------
mm/vmscan.c | 11 +++++++----
net/sunrpc/auth.c | 4 +++-
17 files changed, 69 insertions(+), 35 deletions(-)
diff --git a/arch/x86/kvm/mmu.c b/arch/x86/kvm/mmu.c
index b6a9963..e194cb6 100644
--- a/arch/x86/kvm/mmu.c
+++ b/arch/x86/kvm/mmu.c
@@ -3579,10 +3579,11 @@ static int kvm_mmu_remove_some_alloc_mmu_pages(struct kvm *kvm,
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_slab_to_reclaim;
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 4aaf6cd..99afb5b 100644
--- a/drivers/gpu/drm/i915/i915_gem.c
+++ b/drivers/gpu/drm/i915/i915_gem.c
@@ -4105,9 +4105,7 @@ i915_gpu_is_active(struct drm_device *dev)
}
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,
@@ -4115,6 +4113,7 @@ i915_gem_inactive_shrink(struct shrinker *shrinker,
mm.inactive_shrinker);
struct drm_device *dev = dev_priv->dev;
struct drm_i915_gem_object *obj, *next;
+ int nr_to_scan = sc->nr_slab_to_reclaim;
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 737a2a2..2f2376b 100644
--- a/drivers/gpu/drm/ttm/ttm_page_alloc.c
+++ b/drivers/gpu/drm/ttm/ttm_page_alloc.c
@@ -395,12 +395,14 @@ static int ttm_pool_get_num_unused_pages(void)
/**
* 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_slab_to_reclaim;
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..135851a 100644
--- a/drivers/staging/zcache/zcache.c
+++ b/drivers/staging/zcache/zcache.c
@@ -1181,9 +1181,12 @@ static bool zcache_freeze;
/*
* 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_slab_to_reclaim;
+ 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 2f65679..47566ab 100644
--- a/fs/dcache.c
+++ b/fs/dcache.c
@@ -1237,7 +1237,7 @@ void shrink_dcache_parent(struct dentry * parent)
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:
@@ -1248,8 +1248,12 @@ EXPORT_SYMBOL(shrink_dcache_parent);
*
* 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_slab_to_reclaim;
+ gfp_t gfp_mask = sc->gfp_mask;
+
if (nr) {
if (!(gfp_mask & __GFP_FS))
return -1;
diff --git a/fs/gfs2/glock.c b/fs/gfs2/glock.c
index bc36aef..e196ece 100644
--- a/fs/gfs2/glock.c
+++ b/fs/gfs2/glock.c
@@ -1348,11 +1348,14 @@ void gfs2_glock_complete(struct gfs2_glock *gl, int ret)
}
-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_slab_to_reclaim;
+ gfp_t gfp_mask = sc->gfp_mask;
LIST_HEAD(skipped);
if (nr == 0)
diff --git a/fs/inode.c b/fs/inode.c
index f4018ab..e65d00a 100644
--- a/fs/inode.c
+++ b/fs/inode.c
@@ -703,8 +703,12 @@ static void prune_icache(int nr_to_scan)
* 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_slab_to_reclaim;
+ 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 a25444ab..3ba68e4 100644
--- a/fs/mbcache.c
+++ b/fs/mbcache.c
@@ -90,7 +90,8 @@ static DEFINE_SPINLOCK(mb_cache_spinlock);
* 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 @@ forget:
* 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_slab_to_reclaim;
+ 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 2c3eb33..27aa4a4 100644
--- a/fs/nfs/dir.c
+++ b/fs/nfs/dir.c
@@ -1962,11 +1962,14 @@ static void nfs_access_free_list(struct list_head *head)
}
}
-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_slab_to_reclaim;
+ 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 cf9fdbd..fabb489 100644
--- a/fs/nfs/internal.h
+++ b/fs/nfs/internal.h
@@ -218,7 +218,7 @@ void nfs_close_context(struct nfs_open_context *ctx, int is_sync);
/* 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 a2a622e..09d8750 100644
--- a/fs/quota/dquot.c
+++ b/fs/quota/dquot.c
@@ -696,8 +696,11 @@ static void prune_dqcache(int count)
* 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_slab_to_reclaim;
+
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 5cb230f..a1d6e62 100644
--- a/fs/xfs/linux-2.6/xfs_buf.c
+++ b/fs/xfs/linux-2.6/xfs_buf.c
@@ -1542,12 +1542,12 @@ restart:
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_slab_to_reclaim;
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 6c10f1d..6749bd3 100644
--- a/fs/xfs/linux-2.6/xfs_sync.c
+++ b/fs/xfs/linux-2.6/xfs_sync.c
@@ -998,13 +998,14 @@ xfs_reclaim_inodes(
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_slab_to_reclaim;
+ 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 254ee06..8e7991c 100644
--- a/fs/xfs/quota/xfs_qm.c
+++ b/fs/xfs/quota/xfs_qm.c
@@ -60,7 +60,7 @@ STATIC void xfs_qm_list_destroy(xfs_dqlist_t *);
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,
@@ -2016,10 +2016,11 @@ xfs_qm_shake_freelist(
STATIC int
xfs_qm_shake(
struct shrinker *shrink,
- int nr_to_scan,
- gfp_t gfp_mask)
+ struct shrink_control *sc)
{
int ndqused, nfree, n;
+ int nr_to_scan = sc->nr_slab_to_reclaim;
+ 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 7a2f657..abc13ea 100644
--- a/include/linux/mm.h
+++ b/include/linux/mm.h
@@ -1137,16 +1137,19 @@ static inline void sync_mm_rss(struct task_struct *task, struct mm_struct *mm)
struct shrink_control {
unsigned long nr_scanned;
gfp_t gfp_mask;
+
+ /* How many slab objects shrinker() should reclaim */
+ unsigned long nr_slab_to_reclaim;
};
/*
* 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_slab_to_reclaim'
+ * and a 'gfpmask'. It should look through the least-recently-us
+ * 'nr_slab_to_reclaim' 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.
@@ -1155,7 +1158,7 @@ struct shrink_control {
* 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 */
diff --git a/mm/vmscan.c b/mm/vmscan.c
index 40edf73..1241e87 100644
--- a/mm/vmscan.c
+++ b/mm/vmscan.c
@@ -239,7 +239,8 @@ unsigned long shrink_slab(struct shrink_control *shrink,
unsigned long total_scan;
unsigned long max_pass;
- max_pass = (*shrinker->shrink)(shrinker, 0, gfp_mask);
+ shrink->nr_slab_to_reclaim = 0;
+ max_pass = (*shrinker->shrink)(shrinker, shrink);
delta = (4 * scanned) / shrinker->seeks;
delta *= max_pass;
do_div(delta, lru_pages + 1);
@@ -267,9 +268,11 @@ unsigned long shrink_slab(struct shrink_control *shrink,
int shrink_ret;
int nr_before;
- nr_before = (*shrinker->shrink)(shrinker, 0, gfp_mask);
- shrink_ret = (*shrinker->shrink)(shrinker, this_scan,
- gfp_mask);
+ shrink->nr_slab_to_reclaim = 0;
+ nr_before = (*shrinker->shrink)(shrinker, shrink);
+ shrink->nr_slab_to_reclaim = this_scan;
+ shrink_ret = (*shrinker->shrink)(shrinker, shrink);
+
if (shrink_ret == -1)
break;
if (shrink_ret < nr_before)
diff --git a/net/sunrpc/auth.c b/net/sunrpc/auth.c
index 67e3127..287dd25 100644
--- a/net/sunrpc/auth.c
+++ b/net/sunrpc/auth.c
@@ -326,10 +326,12 @@ rpcauth_prune_expired(struct list_head *free, int nr_to_scan)
* 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_slab_to_reclaim;
+ gfp_t gfp_mask = sc->gfp_mask;
if ((gfp_mask & GFP_KERNEL) != GFP_KERNEL)
return (nr_to_scan == 0) ? 0 : -1;
--
1.7.3.1
--
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