1 files changed, 22 insertions, 712 deletions

diff --git a/mm/vmscan.c b/mm/vmscan.c
index 0dfb9a75df..bba207f41b 100644
--- a/mm/vmscan.c
+++ b/mm/vmscan.c
@@ -35,7 +35,6 @@
 #include <linux/cpuset.h>
 #include <linux/compaction.h>
 #include <linux/notifier.h>
-#include <linux/rwsem.h>
 #include <linux/delay.h>
 #include <linux/kthread.h>
 #include <linux/freezer.h>
@@ -188,246 +187,7 @@ struct scan_control {
  */
 int vm_swappiness = 60;
 
-LIST_HEAD(shrinker_list);
-DECLARE_RWSEM(shrinker_rwsem);
-
 #ifdef CONFIG_MEMCG
-static int shrinker_nr_max;
-
-/* The shrinker_info is expanded in a batch of BITS_PER_LONG */
-static inline int shrinker_map_size(int nr_items)
-{
-	return (DIV_ROUND_UP(nr_items, BITS_PER_LONG) * sizeof(unsigned long));
-}
-
-static inline int shrinker_defer_size(int nr_items)
-{
-	return (round_up(nr_items, BITS_PER_LONG) * sizeof(atomic_long_t));
-}
-
-static struct shrinker_info *shrinker_info_protected(struct mem_cgroup *memcg,
-						     int nid)
-{
-	return rcu_dereference_protected(memcg->nodeinfo[nid]->shrinker_info,
-					 lockdep_is_held(&shrinker_rwsem));
-}
-
-static int expand_one_shrinker_info(struct mem_cgroup *memcg,
-				    int map_size, int defer_size,
-				    int old_map_size, int old_defer_size,
-				    int new_nr_max)
-{
-	struct shrinker_info *new, *old;
-	struct mem_cgroup_per_node *pn;
-	int nid;
-	int size = map_size + defer_size;
-
-	for_each_node(nid) {
-		pn = memcg->nodeinfo[nid];
-		old = shrinker_info_protected(memcg, nid);
-		/* Not yet online memcg */
-		if (!old)
-			return 0;
-
-		/* Already expanded this shrinker_info */
-		if (new_nr_max <= old->map_nr_max)
-			continue;
-
-		new = kvmalloc_node(sizeof(*new) + size, GFP_KERNEL, nid);
-		if (!new)
-			return -ENOMEM;
-
-		new->nr_deferred = (atomic_long_t *)(new + 1);
-		new->map = (void *)new->nr_deferred + defer_size;
-		new->map_nr_max = new_nr_max;
-
-		/* map: set all old bits, clear all new bits */
-		memset(new->map, (int)0xff, old_map_size);
-		memset((void *)new->map + old_map_size, 0, map_size - old_map_size);
-		/* nr_deferred: copy old values, clear all new values */
-		memcpy(new->nr_deferred, old->nr_deferred, old_defer_size);
-		memset((void *)new->nr_deferred + old_defer_size, 0,
-		       defer_size - old_defer_size);
-
-		rcu_assign_pointer(pn->shrinker_info, new);
-		kvfree_rcu(old, rcu);
-	}
-
-	return 0;
-}
-
-void free_shrinker_info(struct mem_cgroup *memcg)
-{
-	struct mem_cgroup_per_node *pn;
-	struct shrinker_info *info;
-	int nid;
-
-	for_each_node(nid) {
-		pn = memcg->nodeinfo[nid];
-		info = rcu_dereference_protected(pn->shrinker_info, true);
-		kvfree(info);
-		rcu_assign_pointer(pn->shrinker_info, NULL);
-	}
-}
-
-int alloc_shrinker_info(struct mem_cgroup *memcg)
-{
-	struct shrinker_info *info;
-	int nid, size, ret = 0;
-	int map_size, defer_size = 0;
-
-	down_write(&shrinker_rwsem);
-	map_size = shrinker_map_size(shrinker_nr_max);
-	defer_size = shrinker_defer_size(shrinker_nr_max);
-	size = map_size + defer_size;
-	for_each_node(nid) {
-		info = kvzalloc_node(sizeof(*info) + size, GFP_KERNEL, nid);
-		if (!info) {
-			free_shrinker_info(memcg);
-			ret = -ENOMEM;
-			break;
-		}
-		info->nr_deferred = (atomic_long_t *)(info + 1);
-		info->map = (void *)info->nr_deferred + defer_size;
-		info->map_nr_max = shrinker_nr_max;
-		rcu_assign_pointer(memcg->nodeinfo[nid]->shrinker_info, info);
-	}
-	up_write(&shrinker_rwsem);
-
-	return ret;
-}
-
-static int expand_shrinker_info(int new_id)
-{
-	int ret = 0;
-	int new_nr_max = round_up(new_id + 1, BITS_PER_LONG);
-	int map_size, defer_size = 0;
-	int old_map_size, old_defer_size = 0;
-	struct mem_cgroup *memcg;
-
-	if (!root_mem_cgroup)
-		goto out;
-
-	lockdep_assert_held(&shrinker_rwsem);
-
-	map_size = shrinker_map_size(new_nr_max);
-	defer_size = shrinker_defer_size(new_nr_max);
-	old_map_size = shrinker_map_size(shrinker_nr_max);
-	old_defer_size = shrinker_defer_size(shrinker_nr_max);
-
-	memcg = mem_cgroup_iter(NULL, NULL, NULL);
-	do {
-		ret = expand_one_shrinker_info(memcg, map_size, defer_size,
-					       old_map_size, old_defer_size,
-					       new_nr_max);
-		if (ret) {
-			mem_cgroup_iter_break(NULL, memcg);
-			goto out;
-		}
-	} while ((memcg = mem_cgroup_iter(NULL, memcg, NULL)) != NULL);
-out:
-	if (!ret)
-		shrinker_nr_max = new_nr_max;
-
-	return ret;
-}
-
-void set_shrinker_bit(struct mem_cgroup *memcg, int nid, int shrinker_id)
-{
-	if (shrinker_id >= 0 && memcg && !mem_cgroup_is_root(memcg)) {
-		struct shrinker_info *info;
-
-		rcu_read_lock();
-		info = rcu_dereference(memcg->nodeinfo[nid]->shrinker_info);
-		if (!WARN_ON_ONCE(shrinker_id >= info->map_nr_max)) {
-			/* Pairs with smp mb in shrink_slab() */
-			smp_mb__before_atomic();
-			set_bit(shrinker_id, info->map);
-		}
-		rcu_read_unlock();
-	}
-}
-
-static DEFINE_IDR(shrinker_idr);
-
-static int prealloc_memcg_shrinker(struct shrinker *shrinker)
-{
-	int id, ret = -ENOMEM;
-
-	if (mem_cgroup_disabled())
-		return -ENOSYS;
-
-	down_write(&shrinker_rwsem);
-	/* This may call shrinker, so it must use down_read_trylock() */
-	id = idr_alloc(&shrinker_idr, shrinker, 0, 0, GFP_KERNEL);
-	if (id < 0)
-		goto unlock;
-
-	if (id >= shrinker_nr_max) {
-		if (expand_shrinker_info(id)) {
-			idr_remove(&shrinker_idr, id);
-			goto unlock;
-		}
-	}
-	shrinker->id = id;
-	ret = 0;
-unlock:
-	up_write(&shrinker_rwsem);
-	return ret;
-}
-
-static void unregister_memcg_shrinker(struct shrinker *shrinker)
-{
-	int id = shrinker->id;
-
-	BUG_ON(id < 0);
-
-	lockdep_assert_held(&shrinker_rwsem);
-
-	idr_remove(&shrinker_idr, id);
-}
-
-static long xchg_nr_deferred_memcg(int nid, struct shrinker *shrinker,
-				   struct mem_cgroup *memcg)
-{
-	struct shrinker_info *info;
-
-	info = shrinker_info_protected(memcg, nid);
-	return atomic_long_xchg(&info->nr_deferred[shrinker->id], 0);
-}
-
-static long add_nr_deferred_memcg(long nr, int nid, struct shrinker *shrinker,
-				  struct mem_cgroup *memcg)
-{
-	struct shrinker_info *info;
-
-	info = shrinker_info_protected(memcg, nid);
-	return atomic_long_add_return(nr, &info->nr_deferred[shrinker->id]);
-}
-
-void reparent_shrinker_deferred(struct mem_cgroup *memcg)
-{
-	int i, nid;
-	long nr;
-	struct mem_cgroup *parent;
-	struct shrinker_info *child_info, *parent_info;
-
-	parent = parent_mem_cgroup(memcg);
-	if (!parent)
-		parent = root_mem_cgroup;
-
-	/* Prevent from concurrent shrinker_info expand */
-	down_read(&shrinker_rwsem);
-	for_each_node(nid) {
-		child_info = shrinker_info_protected(memcg, nid);
-		parent_info = shrinker_info_protected(parent, nid);
-		for (i = 0; i < child_info->map_nr_max; i++) {
-			nr = atomic_long_read(&child_info->nr_deferred[i]);
-			atomic_long_add(nr, &parent_info->nr_deferred[i]);
-		}
-	}
-	up_read(&shrinker_rwsem);
-}
 
 /* Returns true for reclaim through cgroup limits or cgroup interfaces. */
 static bool cgroup_reclaim(struct scan_control *sc)
@@ -468,27 +228,6 @@ static bool writeback_throttling_sane(struct scan_control *sc)
 	return false;
 }
 #else
-static int prealloc_memcg_shrinker(struct shrinker *shrinker)
-{
-	return -ENOSYS;
-}
-
-static void unregister_memcg_shrinker(struct shrinker *shrinker)
-{
-}
-
-static long xchg_nr_deferred_memcg(int nid, struct shrinker *shrinker,
-				   struct mem_cgroup *memcg)
-{
-	return 0;
-}
-
-static long add_nr_deferred_memcg(long nr, int nid, struct shrinker *shrinker,
-				  struct mem_cgroup *memcg)
-{
-	return 0;
-}
-
 static bool cgroup_reclaim(struct scan_control *sc)
 {
 	return false;
@@ -557,39 +296,6 @@ static void flush_reclaim_state(struct scan_control *sc)
 	}
 }
 
-static long xchg_nr_deferred(struct shrinker *shrinker,
-			     struct shrink_control *sc)
-{
-	int nid = sc->nid;
-
-	if (!(shrinker->flags & SHRINKER_NUMA_AWARE))
-		nid = 0;
-
-	if (sc->memcg &&
-	    (shrinker->flags & SHRINKER_MEMCG_AWARE))
-		return xchg_nr_deferred_memcg(nid, shrinker,
-					      sc->memcg);
-
-	return atomic_long_xchg(&shrinker->nr_deferred[nid], 0);
-}
-
-
-static long add_nr_deferred(long nr, struct shrinker *shrinker,
-			    struct shrink_control *sc)
-{
-	int nid = sc->nid;
-
-	if (!(shrinker->flags & SHRINKER_NUMA_AWARE))
-		nid = 0;
-
-	if (sc->memcg &&
-	    (shrinker->flags & SHRINKER_MEMCG_AWARE))
-		return add_nr_deferred_memcg(nr, nid, shrinker,
-					     sc->memcg);
-
-	return atomic_long_add_return(nr, &shrinker->nr_deferred[nid]);
-}
-
 static bool can_demote(int nid, struct scan_control *sc)
 {
 	if (!numa_demotion_enabled)
@@ -671,413 +377,6 @@ static unsigned long lruvec_lru_size(struct lruvec *lruvec, enum lru_list lru,
 	return size;
 }
 
-/*
- * Add a shrinker callback to be called from the vm.
- */
-static int __prealloc_shrinker(struct shrinker *shrinker)
-{
-	unsigned int size;
-	int err;
-
-	if (shrinker->flags & SHRINKER_MEMCG_AWARE) {
-		err = prealloc_memcg_shrinker(shrinker);
-		if (err != -ENOSYS)
-			return err;
-
-		shrinker->flags &= ~SHRINKER_MEMCG_AWARE;
-	}
-
-	size = sizeof(*shrinker->nr_deferred);
-	if (shrinker->flags & SHRINKER_NUMA_AWARE)
-		size *= nr_node_ids;
-
-	shrinker->nr_deferred = kzalloc(size, GFP_KERNEL);
-	if (!shrinker->nr_deferred)
-		return -ENOMEM;
-
-	return 0;
-}
-
-#ifdef CONFIG_SHRINKER_DEBUG
-int prealloc_shrinker(struct shrinker *shrinker, const char *fmt, ...)
-{
-	va_list ap;
-	int err;
-
-	va_start(ap, fmt);
-	shrinker->name = kvasprintf_const(GFP_KERNEL, fmt, ap);
-	va_end(ap);
-	if (!shrinker->name)
-		return -ENOMEM;
-
-	err = __prealloc_shrinker(shrinker);
-	if (err) {
-		kfree_const(shrinker->name);
-		shrinker->name = NULL;
-	}
-
-	return err;
-}
-#else
-int prealloc_shrinker(struct shrinker *shrinker, const char *fmt, ...)
-{
-	return __prealloc_shrinker(shrinker);
-}
-#endif
-
-void free_prealloced_shrinker(struct shrinker *shrinker)
-{
-#ifdef CONFIG_SHRINKER_DEBUG
-	kfree_const(shrinker->name);
-	shrinker->name = NULL;
-#endif
-	if (shrinker->flags & SHRINKER_MEMCG_AWARE) {
-		down_write(&shrinker_rwsem);
-		unregister_memcg_shrinker(shrinker);
-		up_write(&shrinker_rwsem);
-		return;
-	}
-
-	kfree(shrinker->nr_deferred);
-	shrinker->nr_deferred = NULL;
-}
-
-void register_shrinker_prepared(struct shrinker *shrinker)
-{
-	down_write(&shrinker_rwsem);
-	list_add_tail(&shrinker->list, &shrinker_list);
-	shrinker->flags |= SHRINKER_REGISTERED;
-	shrinker_debugfs_add(shrinker);
-	up_write(&shrinker_rwsem);
-}
-
-static int __register_shrinker(struct shrinker *shrinker)
-{
-	int err = __prealloc_shrinker(shrinker);
-
-	if (err)
-		return err;
-	register_shrinker_prepared(shrinker);
-	return 0;
-}
-
-#ifdef CONFIG_SHRINKER_DEBUG
-int register_shrinker(struct shrinker *shrinker, const char *fmt, ...)
-{
-	va_list ap;
-	int err;
-
-	va_start(ap, fmt);
-	shrinker->name = kvasprintf_const(GFP_KERNEL, fmt, ap);
-	va_end(ap);
-	if (!shrinker->name)
-		return -ENOMEM;
-
-	err = __register_shrinker(shrinker);
-	if (err) {
-		kfree_const(shrinker->name);
-		shrinker->name = NULL;
-	}
-	return err;
-}
-#else
-int register_shrinker(struct shrinker *shrinker, const char *fmt, ...)
-{
-	return __register_shrinker(shrinker);
-}
-#endif
-EXPORT_SYMBOL(register_shrinker);
-
-/*
- * Remove one
- */
-void unregister_shrinker(struct shrinker *shrinker)
-{
-	struct dentry *debugfs_entry;
-	int debugfs_id;
-
-	if (!(shrinker->flags & SHRINKER_REGISTERED))
-		return;
-
-	down_write(&shrinker_rwsem);
-	list_del(&shrinker->list);
-	shrinker->flags &= ~SHRINKER_REGISTERED;
-	if (shrinker->flags & SHRINKER_MEMCG_AWARE)
-		unregister_memcg_shrinker(shrinker);
-	debugfs_entry = shrinker_debugfs_detach(shrinker, &debugfs_id);
-	up_write(&shrinker_rwsem);
-
-	shrinker_debugfs_remove(debugfs_entry, debugfs_id);
-
-	kfree(shrinker->nr_deferred);
-	shrinker->nr_deferred = NULL;
-}
-EXPORT_SYMBOL(unregister_shrinker);
-
-/**
- * synchronize_shrinkers - Wait for all running shrinkers to complete.
- *
- * This is equivalent to calling unregister_shrink() and register_shrinker(),
- * but atomically and with less overhead. This is useful to guarantee that all
- * shrinker invocations have seen an update, before freeing memory, similar to
- * rcu.
- */
-void synchronize_shrinkers(void)
-{
-	down_write(&shrinker_rwsem);
-	up_write(&shrinker_rwsem);
-}
-EXPORT_SYMBOL(synchronize_shrinkers);
-
-#define SHRINK_BATCH 128
-
-static unsigned long do_shrink_slab(struct shrink_control *shrinkctl,
-				    struct shrinker *shrinker, int priority)
-{
-	unsigned long freed = 0;
-	unsigned long long delta;
-	long total_scan;
-	long freeable;
-	long nr;
-	long new_nr;
-	long batch_size = shrinker->batch ? shrinker->batch
-					  : SHRINK_BATCH;
-	long scanned = 0, next_deferred;
-
-	freeable = shrinker->count_objects(shrinker, shrinkctl);
-	if (freeable == 0 || freeable == SHRINK_EMPTY)
-		return freeable;
-
-	/*
-	 * copy the current shrinker scan count into a local variable
-	 * and zero it so that other concurrent shrinker invocations
-	 * don't also do this scanning work.
-	 */
-	nr = xchg_nr_deferred(shrinker, shrinkctl);
-
-	if (shrinker->seeks) {
-		delta = freeable >> priority;
-		delta *= 4;
-		do_div(delta, shrinker->seeks);
-	} else {
-		/*
-		 * These objects don't require any IO to create. Trim
-		 * them aggressively under memory pressure to keep
-		 * them from causing refetches in the IO caches.
-		 */
-		delta = freeable / 2;
-	}
-
-	total_scan = nr >> priority;
-	total_scan += delta;
-	total_scan = min(total_scan, (2 * freeable));
-
-	trace_mm_shrink_slab_start(shrinker, shrinkctl, nr,
-				   freeable, delta, total_scan, priority);
-
-	/*
-	 * Normally, we should not scan less than batch_size objects in one
-	 * pass to avoid too frequent shrinker calls, but if the slab has less
-	 * than batch_size objects in total and we are really tight on memory,
-	 * we will try to reclaim all available objects, otherwise we can end
-	 * up failing allocations although there are plenty of reclaimable
-	 * objects spread over several slabs with usage less than the
-	 * batch_size.
-	 *
-	 * We detect the "tight on memory" situations by looking at the total
-	 * number of objects we want to scan (total_scan). If it is greater
-	 * than the total number of objects on slab (freeable), we must be
-	 * scanning at high prio and therefore should try to reclaim as much as
-	 * possible.
-	 */
-	while (total_scan >= batch_size ||
-	       total_scan >= freeable) {
-		unsigned long ret;
-		unsigned long nr_to_scan = min(batch_size, total_scan);
-
-		shrinkctl->nr_to_scan = nr_to_scan;
-		shrinkctl->nr_scanned = nr_to_scan;
-		ret = shrinker->scan_objects(shrinker, shrinkctl);
-		if (ret == SHRINK_STOP)
-			break;
-		freed += ret;
-
-		count_vm_events(SLABS_SCANNED, shrinkctl->nr_scanned);
-		total_scan -= shrinkctl->nr_scanned;
-		scanned += shrinkctl->nr_scanned;
-
-		cond_resched();
-	}
-
-	/*
-	 * The deferred work is increased by any new work (delta) that wasn't
-	 * done, decreased by old deferred work that was done now.
-	 *
-	 * And it is capped to two times of the freeable items.
-	 */
-	next_deferred = max_t(long, (nr + delta - scanned), 0);
-	next_deferred = min(next_deferred, (2 * freeable));
-
-	/*
-	 * move the unused scan count back into the shrinker in a
-	 * manner that handles concurrent updates.
-	 */
-	new_nr = add_nr_deferred(next_deferred, shrinker, shrinkctl);
-
-	trace_mm_shrink_slab_end(shrinker, shrinkctl->nid, freed, nr, new_nr, total_scan);
-	return freed;
-}
-
-#ifdef CONFIG_MEMCG
-static unsigned long shrink_slab_memcg(gfp_t gfp_mask, int nid,
-			struct mem_cgroup *memcg, int priority)
-{
-	struct shrinker_info *info;
-	unsigned long ret, freed = 0;
-	int i;
-
-	if (!mem_cgroup_online(memcg))
-		return 0;
-
-	if (!down_read_trylock(&shrinker_rwsem))
-		return 0;
-
-	info = shrinker_info_protected(memcg, nid);
-	if (unlikely(!info))
-		goto unlock;
-
-	for_each_set_bit(i, info->map, info->map_nr_max) {
-		struct shrink_control sc = {
-			.gfp_mask = gfp_mask,
-			.nid = nid,
-			.memcg = memcg,
-		};
-		struct shrinker *shrinker;
-
-		shrinker = idr_find(&shrinker_idr, i);
-		if (unlikely(!shrinker || !(shrinker->flags & SHRINKER_REGISTERED))) {
-			if (!shrinker)
-				clear_bit(i, info->map);
-			continue;
-		}
-
-		/* Call non-slab shrinkers even though kmem is disabled */
-		if (!memcg_kmem_online() &&
-		    !(shrinker->flags & SHRINKER_NONSLAB))
-			continue;
-
-		ret = do_shrink_slab(&sc, shrinker, priority);
-		if (ret == SHRINK_EMPTY) {
-			clear_bit(i, info->map);
-			/*
-			 * After the shrinker reported that it had no objects to
-			 * free, but before we cleared the corresponding bit in
-			 * the memcg shrinker map, a new object might have been
-			 * added. To make sure, we have the bit set in this
-			 * case, we invoke the shrinker one more time and reset
-			 * the bit if it reports that it is not empty anymore.
-			 * The memory barrier here pairs with the barrier in
-			 * set_shrinker_bit():
-			 *
-			 * list_lru_add()     shrink_slab_memcg()
-			 *   list_add_tail()    clear_bit()
-			 *   <MB>               <MB>
-			 *   set_bit()          do_shrink_slab()
-			 */
-			smp_mb__after_atomic();
-			ret = do_shrink_slab(&sc, shrinker, priority);
-			if (ret == SHRINK_EMPTY)
-				ret = 0;
-			else
-				set_shrinker_bit(memcg, nid, i);
-		}
-		freed += ret;
-
-		if (rwsem_is_contended(&shrinker_rwsem)) {
-			freed = freed ? : 1;
-			break;
-		}
-	}
-unlock:
-	up_read(&shrinker_rwsem);
-	return freed;
-}
-#else /* CONFIG_MEMCG */
-static unsigned long shrink_slab_memcg(gfp_t gfp_mask, int nid,
-			struct mem_cgroup *memcg, int priority)
-{
-	return 0;
-}
-#endif /* CONFIG_MEMCG */
-
-/**
- * shrink_slab - shrink slab caches
- * @gfp_mask: allocation context
- * @nid: node whose slab caches to target
- * @memcg: memory cgroup whose slab caches to target
- * @priority: the reclaim priority
- *
- * Call the shrink functions to age shrinkable caches.
- *
- * @nid is passed along to shrinkers with SHRINKER_NUMA_AWARE set,
- * unaware shrinkers will receive a node id of 0 instead.
- *
- * @memcg specifies the memory cgroup to target. Unaware shrinkers
- * are called only if it is the root cgroup.
- *
- * @priority is sc->priority, we take the number of objects and >> by priority
- * in order to get the scan target.
- *
- * Returns the number of reclaimed slab objects.
- */
-static unsigned long shrink_slab(gfp_t gfp_mask, int nid,
-				 struct mem_cgroup *memcg,
-				 int priority)
-{
-	unsigned long ret, freed = 0;
-	struct shrinker *shrinker;
-
-	/*
-	 * The root memcg might be allocated even though memcg is disabled
-	 * via "cgroup_disable=memory" boot parameter.  This could make
-	 * mem_cgroup_is_root() return false, then just run memcg slab
-	 * shrink, but skip global shrink.  This may result in premature
-	 * oom.
-	 */
-	if (!mem_cgroup_disabled() && !mem_cgroup_is_root(memcg))
-		return shrink_slab_memcg(gfp_mask, nid, memcg, priority);
-
-	if (!down_read_trylock(&shrinker_rwsem))
-		goto out;
-
-	list_for_each_entry(shrinker, &shrinker_list, list) {
-		struct shrink_control sc = {
-			.gfp_mask = gfp_mask,
-			.nid = nid,
-			.memcg = memcg,
-		};
-
-		ret = do_shrink_slab(&sc, shrinker, priority);
-		if (ret == SHRINK_EMPTY)
-			ret = 0;
-		freed += ret;
-		/*
-		 * Bail out if someone want to register a new shrinker to
-		 * prevent the registration from being stalled for long periods
-		 * by parallel ongoing shrinking.
-		 */
-		if (rwsem_is_contended(&shrinker_rwsem)) {
-			freed = freed ? : 1;
-			break;
-		}
-	}
-
-	up_read(&shrinker_rwsem);
-out:
-	cond_resched();
-	return freed;
-}
-
 static unsigned long drop_slab_node(int nid)
 {
 	unsigned long freed = 0;
@@ -1915,6 +1214,7 @@ retry:
 								folio_list))
 						goto activate_locked;
 #ifdef CONFIG_TRANSPARENT_HUGEPAGE
+					count_memcg_folio_events(folio, THP_SWPOUT_FALLBACK, 1);
 					count_vm_event(THP_SWPOUT_FALLBACK);
 #endif
 					if (!add_to_swap(folio))
@@ -2271,7 +1571,7 @@ static bool skip_cma(struct folio *folio, struct scan_control *sc)
 {
 	return !current_is_kswapd() &&
 			gfp_migratetype(sc->gfp_mask) != MIGRATE_MOVABLE &&
-			get_pageblock_migratetype(&folio->page) == MIGRATE_CMA;
+			folio_migratetype(folio) == MIGRATE_CMA;
 }
 #else
 static bool skip_cma(struct folio *folio, struct scan_control *sc)
@@ -2389,8 +1689,7 @@ move:
 	}
 	*nr_scanned = total_scan;
 	trace_mm_vmscan_lru_isolate(sc->reclaim_idx, sc->order, nr_to_scan,
-				    total_scan, skipped, nr_taken,
-				    sc->may_unmap ? 0 : ISOLATE_UNMAPPED, lru);
+				    total_scan, skipped, nr_taken, lru);
 	update_lru_sizes(lruvec, lru, nr_zone_taken);
 	return nr_taken;
 }
@@ -2909,7 +2208,7 @@ enum scan_balance {
 	SCAN_FILE,
 };
 
-static void prepare_scan_count(pg_data_t *pgdat, struct scan_control *sc)
+static void prepare_scan_control(pg_data_t *pgdat, struct scan_control *sc)
 {
 	unsigned long file;
 	struct lruvec *target_lruvec;
@@ -5010,6 +4309,7 @@ static int scan_folios(struct lruvec *lruvec, struct scan_control *sc,
 	int sorted = 0;
 	int scanned = 0;
 	int isolated = 0;
+	int skipped = 0;
 	int remaining = MAX_LRU_BATCH;
 	struct lru_gen_folio *lrugen = &lruvec->lrugen;
 	struct mem_cgroup *memcg = lruvec_memcg(lruvec);
@@ -5023,7 +4323,7 @@ static int scan_folios(struct lruvec *lruvec, struct scan_control *sc,
 
 	for (i = MAX_NR_ZONES; i > 0; i--) {
 		LIST_HEAD(moved);
-		int skipped = 0;
+		int skipped_zone = 0;
 		int zone = (sc->reclaim_idx + i) % MAX_NR_ZONES;
 		struct list_head *head = &lrugen->folios[gen][type][zone];
 
@@ -5045,16 +4345,17 @@ static int scan_folios(struct lruvec *lruvec, struct scan_control *sc,
 				isolated += delta;
 			} else {
 				list_move(&folio->lru, &moved);
-				skipped += delta;
+				skipped_zone += delta;
 			}
 
-			if (!--remaining || max(isolated, skipped) >= MIN_LRU_BATCH)
+			if (!--remaining || max(isolated, skipped_zone) >= MIN_LRU_BATCH)
 				break;
 		}
 
-		if (skipped) {
+		if (skipped_zone) {
 			list_splice(&moved, head);
-			__count_zid_vm_events(PGSCAN_SKIP, zone, skipped);
+			__count_zid_vm_events(PGSCAN_SKIP, zone, skipped_zone);
+			skipped += skipped_zone;
 		}
 
 		if (!remaining || isolated >= MIN_LRU_BATCH)
@@ -5069,6 +4370,9 @@ static int scan_folios(struct lruvec *lruvec, struct scan_control *sc,
 	__count_memcg_events(memcg, item, isolated);
 	__count_memcg_events(memcg, PGREFILL, sorted);
 	__count_vm_events(PGSCAN_ANON + type, isolated);
+	trace_mm_vmscan_lru_isolate(sc->reclaim_idx, sc->order, MAX_LRU_BATCH,
+				scanned, skipped, isolated,
+				type ? LRU_INACTIVE_FILE : LRU_INACTIVE_ANON);
 
 	/*
 	 * There might not be eligible folios due to reclaim_idx. Check the
@@ -5199,6 +4503,9 @@ static int evict_folios(struct lruvec *lruvec, struct scan_control *sc, int swap
 retry:
 	reclaimed = shrink_folio_list(&list, pgdat, sc, &stat, false);
 	sc->nr_reclaimed += reclaimed;
+	trace_mm_vmscan_lru_shrink_inactive(pgdat->node_id,
+			scanned, reclaimed, &stat, sc->priority,
+			type ? LRU_INACTIVE_FILE : LRU_INACTIVE_ANON);
 
 	list_for_each_entry_safe_reverse(folio, next, &list, lru) {
 		if (!folio_evictable(folio)) {
@@ -6570,7 +5877,7 @@ again:
 	nr_reclaimed = sc->nr_reclaimed;
 	nr_scanned = sc->nr_scanned;
 
-	prepare_scan_count(pgdat, sc);
+	prepare_scan_control(pgdat, sc);
 
 	shrink_node_memcgs(pgdat, sc);
 
@@ -7927,8 +7234,9 @@ void __meminit kswapd_run(int nid)
 		pgdat->kswapd = kthread_run(kswapd, pgdat, "kswapd%d", nid);
 		if (IS_ERR(pgdat->kswapd)) {
 			/* failure at boot is fatal */
+			pr_err("Failed to start kswapd on node %d，ret=%ld\n",
+				   nid, PTR_ERR(pgdat->kswapd));
 			BUG_ON(system_state < SYSTEM_RUNNING);
-			pr_err("Failed to start kswapd on node %d\n", nid);
 			pgdat->kswapd = NULL;
 		}
 	}
@@ -8061,6 +7369,7 @@ static int __node_reclaim(struct pglist_data *pgdat, gfp_t gfp_mask, unsigned in
 
 	cond_resched();
 	psi_memstall_enter(&pflags);
+	delayacct_freepages_start();
 	fs_reclaim_acquire(sc.gfp_mask);
 	/*
 	 * We need to be able to allocate from the reserves for RECLAIM_UNMAP
@@ -8083,6 +7392,7 @@ static int __node_reclaim(struct pglist_data *pgdat, gfp_t gfp_mask, unsigned in
 	memalloc_noreclaim_restore(noreclaim_flag);
 	fs_reclaim_release(sc.gfp_mask);
 	psi_memstall_leave(&pflags);
+	delayacct_freepages_end();
 
 	trace_mm_vmscan_node_reclaim_end(sc.nr_reclaimed);