1 files changed, 131 insertions, 143 deletions

diff --git a/mm/vmscan.c b/mm/vmscan.c
index 0f16ffe8eb67..d2f65c856350 100644
--- a/mm/vmscan.c
+++ b/mm/vmscan.c
@@ -59,35 +59,20 @@
 #include <trace/events/vmscan.h>
 
 struct scan_control {
-	/* Incremented by the number of inactive pages that were scanned */
-	unsigned long nr_scanned;
-
-	/* Number of pages freed so far during a call to shrink_zones() */
-	unsigned long nr_reclaimed;
-
 	/* How many pages shrink_list() should reclaim */
 	unsigned long nr_to_reclaim;
 
-	unsigned long hibernation_mode;
-
 	/* This context's GFP mask */
 	gfp_t gfp_mask;
 
-	int may_writepage;
-
-	/* Can mapped pages be reclaimed? */
-	int may_unmap;
-
-	/* Can pages be swapped as part of reclaim? */
-	int may_swap;
-
+	/* Allocation order */
 	int order;
 
-	/* Scan (total_size >> priority) pages at once */
-	int priority;
-
-	/* anon vs. file LRUs scanning "ratio" */
-	int swappiness;
+	/*
+	 * Nodemask of nodes allowed by the caller. If NULL, all nodes
+	 * are scanned.
+	 */
+	nodemask_t	*nodemask;
 
 	/*
 	 * The memory cgroup that hit its limit and as a result is the
@@ -95,11 +80,27 @@ struct scan_control {
 	 */
 	struct mem_cgroup *target_mem_cgroup;
 
-	/*
-	 * Nodemask of nodes allowed by the caller. If NULL, all nodes
-	 * are scanned.
-	 */
-	nodemask_t	*nodemask;
+	/* Scan (total_size >> priority) pages at once */
+	int priority;
+
+	unsigned int may_writepage:1;
+
+	/* Can mapped pages be reclaimed? */
+	unsigned int may_unmap:1;
+
+	/* Can pages be swapped as part of reclaim? */
+	unsigned int may_swap:1;
+
+	unsigned int hibernation_mode:1;
+
+	/* One of the zones is ready for compaction */
+	unsigned int compaction_ready:1;
+
+	/* Incremented by the number of inactive pages that were scanned */
+	unsigned long nr_scanned;
+
+	/* Number of pages freed so far during a call to shrink_zones() */
+	unsigned long nr_reclaimed;
 };
 
 #define lru_to_page(_head) (list_entry((_head)->prev, struct page, lru))
@@ -136,7 +137,11 @@ struct scan_control {
  * From 0 .. 100.  Higher means more swappy.
  */
 int vm_swappiness = 60;
-unsigned long vm_total_pages;	/* The total number of pages which the VM controls */
+/*
+ * The total number of pages which are beyond the high watermark within all
+ * zones.
+ */
+unsigned long vm_total_pages;
 
 static LIST_HEAD(shrinker_list);
 static DECLARE_RWSEM(shrinker_rwsem);
@@ -169,7 +174,8 @@ static unsigned long zone_reclaimable_pages(struct zone *zone)
 
 bool zone_reclaimable(struct zone *zone)
 {
-	return zone->pages_scanned < zone_reclaimable_pages(zone) * 6;
+	return zone_page_state(zone, NR_PAGES_SCANNED) <
+		zone_reclaimable_pages(zone) * 6;
 }
 
 static unsigned long get_lru_size(struct lruvec *lruvec, enum lru_list lru)
@@ -1503,7 +1509,7 @@ shrink_inactive_list(unsigned long nr_to_scan, struct lruvec *lruvec,
 	__mod_zone_page_state(zone, NR_ISOLATED_ANON + file, nr_taken);
 
 	if (global_reclaim(sc)) {
-		zone->pages_scanned += nr_scanned;
+		__mod_zone_page_state(zone, NR_PAGES_SCANNED, nr_scanned);
 		if (current_is_kswapd())
 			__count_zone_vm_events(PGSCAN_KSWAPD, zone, nr_scanned);
 		else
@@ -1693,7 +1699,7 @@ static void shrink_active_list(unsigned long nr_to_scan,
 	nr_taken = isolate_lru_pages(nr_to_scan, lruvec, &l_hold,
 				     &nr_scanned, sc, isolate_mode, lru);
 	if (global_reclaim(sc))
-		zone->pages_scanned += nr_scanned;
+		__mod_zone_page_state(zone, NR_PAGES_SCANNED, nr_scanned);
 
 	reclaim_stat->recent_scanned[file] += nr_taken;
 
@@ -1750,7 +1756,7 @@ static void shrink_active_list(unsigned long nr_to_scan,
 	 * Count referenced pages from currently used mappings as rotated,
 	 * even though only some of them are actually re-activated.  This
 	 * helps balance scan pressure between file and anonymous pages in
-	 * get_scan_ratio.
+	 * get_scan_count.
 	 */
 	reclaim_stat->recent_rotated[file] += nr_rotated;
 
@@ -1865,8 +1871,8 @@ enum scan_balance {
  * nr[0] = anon inactive pages to scan; nr[1] = anon active pages to scan
  * nr[2] = file inactive pages to scan; nr[3] = file active pages to scan
  */
-static void get_scan_count(struct lruvec *lruvec, struct scan_control *sc,
-			   unsigned long *nr)
+static void get_scan_count(struct lruvec *lruvec, int swappiness,
+			   struct scan_control *sc, unsigned long *nr)
 {
 	struct zone_reclaim_stat *reclaim_stat = &lruvec->reclaim_stat;
 	u64 fraction[2];
@@ -1909,7 +1915,7 @@ static void get_scan_count(struct lruvec *lruvec, struct scan_control *sc,
 	 * using the memory controller's swap limit feature would be
 	 * too expensive.
 	 */
-	if (!global_reclaim(sc) && !sc->swappiness) {
+	if (!global_reclaim(sc) && !swappiness) {
 		scan_balance = SCAN_FILE;
 		goto out;
 	}
@@ -1919,16 +1925,11 @@ static void get_scan_count(struct lruvec *lruvec, struct scan_control *sc,
 	 * system is close to OOM, scan both anon and file equally
 	 * (unless the swappiness setting disagrees with swapping).
 	 */
-	if (!sc->priority && sc->swappiness) {
+	if (!sc->priority && swappiness) {
 		scan_balance = SCAN_EQUAL;
 		goto out;
 	}
 
-	anon  = get_lru_size(lruvec, LRU_ACTIVE_ANON) +
-		get_lru_size(lruvec, LRU_INACTIVE_ANON);
-	file  = get_lru_size(lruvec, LRU_ACTIVE_FILE) +
-		get_lru_size(lruvec, LRU_INACTIVE_FILE);
-
 	/*
 	 * Prevent the reclaimer from falling into the cache trap: as
 	 * cache pages start out inactive, every cache fault will tip
@@ -1939,9 +1940,14 @@ static void get_scan_count(struct lruvec *lruvec, struct scan_control *sc,
 	 * anon pages.  Try to detect this based on file LRU size.
 	 */
 	if (global_reclaim(sc)) {
-		unsigned long free = zone_page_state(zone, NR_FREE_PAGES);
+		unsigned long zonefile;
+		unsigned long zonefree;
 
-		if (unlikely(file + free <= high_wmark_pages(zone))) {
+		zonefree = zone_page_state(zone, NR_FREE_PAGES);
+		zonefile = zone_page_state(zone, NR_ACTIVE_FILE) +
+			   zone_page_state(zone, NR_INACTIVE_FILE);
+
+		if (unlikely(zonefile + zonefree <= high_wmark_pages(zone))) {
 			scan_balance = SCAN_ANON;
 			goto out;
 		}
@@ -1962,7 +1968,7 @@ static void get_scan_count(struct lruvec *lruvec, struct scan_control *sc,
 	 * With swappiness at 100, anonymous and file have the same priority.
 	 * This scanning priority is essentially the inverse of IO cost.
 	 */
-	anon_prio = sc->swappiness;
+	anon_prio = swappiness;
 	file_prio = 200 - anon_prio;
 
 	/*
@@ -1976,6 +1982,12 @@ static void get_scan_count(struct lruvec *lruvec, struct scan_control *sc,
 	 *
 	 * anon in [0], file in [1]
 	 */
+
+	anon  = get_lru_size(lruvec, LRU_ACTIVE_ANON) +
+		get_lru_size(lruvec, LRU_INACTIVE_ANON);
+	file  = get_lru_size(lruvec, LRU_ACTIVE_FILE) +
+		get_lru_size(lruvec, LRU_INACTIVE_FILE);
+
 	spin_lock_irq(&zone->lru_lock);
 	if (unlikely(reclaim_stat->recent_scanned[0] > anon / 4)) {
 		reclaim_stat->recent_scanned[0] /= 2;
@@ -2052,7 +2064,8 @@ out:
 /*
  * This is a basic per-zone page freer.  Used by both kswapd and direct reclaim.
  */
-static void shrink_lruvec(struct lruvec *lruvec, struct scan_control *sc)
+static void shrink_lruvec(struct lruvec *lruvec, int swappiness,
+			  struct scan_control *sc)
 {
 	unsigned long nr[NR_LRU_LISTS];
 	unsigned long targets[NR_LRU_LISTS];
@@ -2063,7 +2076,7 @@ static void shrink_lruvec(struct lruvec *lruvec, struct scan_control *sc)
 	struct blk_plug plug;
 	bool scan_adjusted;
 
-	get_scan_count(lruvec, sc, nr);
+	get_scan_count(lruvec, swappiness, sc, nr);
 
 	/* Record the original scan target for proportional adjustments later */
 	memcpy(targets, nr, sizeof(nr));
@@ -2241,9 +2254,10 @@ static inline bool should_continue_reclaim(struct zone *zone,
 	}
 }
 
-static void shrink_zone(struct zone *zone, struct scan_control *sc)
+static bool shrink_zone(struct zone *zone, struct scan_control *sc)
 {
 	unsigned long nr_reclaimed, nr_scanned;
+	bool reclaimable = false;
 
 	do {
 		struct mem_cgroup *root = sc->target_mem_cgroup;
@@ -2259,11 +2273,12 @@ static void shrink_zone(struct zone *zone, struct scan_control *sc)
 		memcg = mem_cgroup_iter(root, NULL, &reclaim);
 		do {
 			struct lruvec *lruvec;
+			int swappiness;
 
 			lruvec = mem_cgroup_zone_lruvec(zone, memcg);
+			swappiness = mem_cgroup_swappiness(memcg);
 
-			sc->swappiness = mem_cgroup_swappiness(memcg);
-			shrink_lruvec(lruvec, sc);
+			shrink_lruvec(lruvec, swappiness, sc);
 
 			/*
 			 * Direct reclaim and kswapd have to scan all memory
@@ -2287,20 +2302,21 @@ static void shrink_zone(struct zone *zone, struct scan_control *sc)
 			   sc->nr_scanned - nr_scanned,
 			   sc->nr_reclaimed - nr_reclaimed);
 
+		if (sc->nr_reclaimed - nr_reclaimed)
+			reclaimable = true;
+
 	} while (should_continue_reclaim(zone, sc->nr_reclaimed - nr_reclaimed,
 					 sc->nr_scanned - nr_scanned, sc));
+
+	return reclaimable;
 }
 
 /* Returns true if compaction should go ahead for a high-order request */
-static inline bool compaction_ready(struct zone *zone, struct scan_control *sc)
+static inline bool compaction_ready(struct zone *zone, int order)
 {
 	unsigned long balance_gap, watermark;
 	bool watermark_ok;
 
-	/* Do not consider compaction for orders reclaim is meant to satisfy */
-	if (sc->order <= PAGE_ALLOC_COSTLY_ORDER)
-		return false;
-
 	/*
 	 * Compaction takes time to run and there are potentially other
 	 * callers using the pages just freed. Continue reclaiming until
@@ -2309,18 +2325,18 @@ static inline bool compaction_ready(struct zone *zone, struct scan_control *sc)
 	 */
 	balance_gap = min(low_wmark_pages(zone), DIV_ROUND_UP(
 			zone->managed_pages, KSWAPD_ZONE_BALANCE_GAP_RATIO));
-	watermark = high_wmark_pages(zone) + balance_gap + (2UL << sc->order);
+	watermark = high_wmark_pages(zone) + balance_gap + (2UL << order);
 	watermark_ok = zone_watermark_ok_safe(zone, 0, watermark, 0, 0);
 
 	/*
 	 * If compaction is deferred, reclaim up to a point where
 	 * compaction will have a chance of success when re-enabled
 	 */
-	if (compaction_deferred(zone, sc->order))
+	if (compaction_deferred(zone, order))
 		return watermark_ok;
 
 	/* If compaction is not ready to start, keep reclaiming */
-	if (!compaction_suitable(zone, sc->order))
+	if (!compaction_suitable(zone, order))
 		return false;
 
 	return watermark_ok;
@@ -2342,10 +2358,7 @@ static inline bool compaction_ready(struct zone *zone, struct scan_control *sc)
  * If a zone is deemed to be full of pinned pages then just give it a light
  * scan then give up on it.
  *
- * This function returns true if a zone is being reclaimed for a costly
- * high-order allocation and compaction is ready to begin. This indicates to
- * the caller that it should consider retrying the allocation instead of
- * further reclaim.
+ * Returns true if a zone was reclaimable.
  */
 static bool shrink_zones(struct zonelist *zonelist, struct scan_control *sc)
 {
@@ -2354,13 +2367,13 @@ static bool shrink_zones(struct zonelist *zonelist, struct scan_control *sc)
 	unsigned long nr_soft_reclaimed;
 	unsigned long nr_soft_scanned;
 	unsigned long lru_pages = 0;
-	bool aborted_reclaim = false;
 	struct reclaim_state *reclaim_state = current->reclaim_state;
 	gfp_t orig_mask;
 	struct shrink_control shrink = {
 		.gfp_mask = sc->gfp_mask,
 	};
 	enum zone_type requested_highidx = gfp_zone(sc->gfp_mask);
+	bool reclaimable = false;
 
 	/*
 	 * If the number of buffer_heads in the machine exceeds the maximum
@@ -2391,22 +2404,24 @@ static bool shrink_zones(struct zonelist *zonelist, struct scan_control *sc)
 			if (sc->priority != DEF_PRIORITY &&
 			    !zone_reclaimable(zone))
 				continue;	/* Let kswapd poll it */
-			if (IS_ENABLED(CONFIG_COMPACTION)) {
-				/*
-				 * If we already have plenty of memory free for
-				 * compaction in this zone, don't free any more.
-				 * Even though compaction is invoked for any
-				 * non-zero order, only frequent costly order
-				 * reclamation is disruptive enough to become a
-				 * noticeable problem, like transparent huge
-				 * page allocations.
-				 */
-				if ((zonelist_zone_idx(z) <= requested_highidx)
-				    && compaction_ready(zone, sc)) {
-					aborted_reclaim = true;
-					continue;
-				}
+
+			/*
+			 * If we already have plenty of memory free for
+			 * compaction in this zone, don't free any more.
+			 * Even though compaction is invoked for any
+			 * non-zero order, only frequent costly order
+			 * reclamation is disruptive enough to become a
+			 * noticeable problem, like transparent huge
+			 * page allocations.
+			 */
+			if (IS_ENABLED(CONFIG_COMPACTION) &&
+			    sc->order > PAGE_ALLOC_COSTLY_ORDER &&
+			    zonelist_zone_idx(z) <= requested_highidx &&
+			    compaction_ready(zone, sc->order)) {
+				sc->compaction_ready = true;
+				continue;
 			}
+
 			/*
 			 * This steals pages from memory cgroups over softlimit
 			 * and returns the number of reclaimed pages and
@@ -2419,10 +2434,17 @@ static bool shrink_zones(struct zonelist *zonelist, struct scan_control *sc)
 						&nr_soft_scanned);
 			sc->nr_reclaimed += nr_soft_reclaimed;
 			sc->nr_scanned += nr_soft_scanned;
+			if (nr_soft_reclaimed)
+				reclaimable = true;
 			/* need some check for avoid more shrink_zone() */
 		}
 
-		shrink_zone(zone, sc);
+		if (shrink_zone(zone, sc))
+			reclaimable = true;
+
+		if (global_reclaim(sc) &&
+		    !reclaimable && zone_reclaimable(zone))
+			reclaimable = true;
 	}
 
 	/*
@@ -2445,27 +2467,7 @@ static bool shrink_zones(struct zonelist *zonelist, struct scan_control *sc)
 	 */
 	sc->gfp_mask = orig_mask;
 
-	return aborted_reclaim;
-}
-
-/* All zones in zonelist are unreclaimable? */
-static bool all_unreclaimable(struct zonelist *zonelist,
-		struct scan_control *sc)
-{
-	struct zoneref *z;
-	struct zone *zone;
-
-	for_each_zone_zonelist_nodemask(zone, z, zonelist,
-			gfp_zone(sc->gfp_mask), sc->nodemask) {
-		if (!populated_zone(zone))
-			continue;
-		if (!cpuset_zone_allowed_hardwall(zone, GFP_KERNEL))
-			continue;
-		if (zone_reclaimable(zone))
-			return false;
-	}
-
-	return true;
+	return reclaimable;
 }
 
 /*
@@ -2489,7 +2491,7 @@ static unsigned long do_try_to_free_pages(struct zonelist *zonelist,
 {
 	unsigned long total_scanned = 0;
 	unsigned long writeback_threshold;
-	bool aborted_reclaim;
+	bool zones_reclaimable;
 
 	delayacct_freepages_start();
 
@@ -2500,11 +2502,14 @@ static unsigned long do_try_to_free_pages(struct zonelist *zonelist,
 		vmpressure_prio(sc->gfp_mask, sc->target_mem_cgroup,
 				sc->priority);
 		sc->nr_scanned = 0;
-		aborted_reclaim = shrink_zones(zonelist, sc);
+		zones_reclaimable = shrink_zones(zonelist, sc);
 
 		total_scanned += sc->nr_scanned;
 		if (sc->nr_reclaimed >= sc->nr_to_reclaim)
-			goto out;
+			break;
+
+		if (sc->compaction_ready)
+			break;
 
 		/*
 		 * If we're getting trouble reclaiming, start doing
@@ -2526,28 +2531,19 @@ static unsigned long do_try_to_free_pages(struct zonelist *zonelist,
 						WB_REASON_TRY_TO_FREE_PAGES);
 			sc->may_writepage = 1;
 		}
-	} while (--sc->priority >= 0 && !aborted_reclaim);
+	} while (--sc->priority >= 0);
 
-out:
 	delayacct_freepages_end();
 
 	if (sc->nr_reclaimed)
 		return sc->nr_reclaimed;
 
-	/*
-	 * As hibernation is going on, kswapd is freezed so that it can't mark
-	 * the zone into all_unreclaimable. Thus bypassing all_unreclaimable
-	 * check.
-	 */
-	if (oom_killer_disabled)
-		return 0;
-
 	/* Aborted reclaim to try compaction? don't OOM, then */
-	if (aborted_reclaim)
+	if (sc->compaction_ready)
 		return 1;
 
-	/* top priority shrink_zones still had more to do? don't OOM, then */
-	if (global_reclaim(sc) && !all_unreclaimable(zonelist, sc))
+	/* Any of the zones still reclaimable?  Don't OOM. */
+	if (zones_reclaimable)
 		return 1;
 
 	return 0;
@@ -2684,15 +2680,14 @@ unsigned long try_to_free_pages(struct zonelist *zonelist, int order,
 {
 	unsigned long nr_reclaimed;
 	struct scan_control sc = {
+		.nr_to_reclaim = SWAP_CLUSTER_MAX,
 		.gfp_mask = (gfp_mask = memalloc_noio_flags(gfp_mask)),
+		.order = order,
+		.nodemask = nodemask,
+		.priority = DEF_PRIORITY,
 		.may_writepage = !laptop_mode,
-		.nr_to_reclaim = SWAP_CLUSTER_MAX,
 		.may_unmap = 1,
 		.may_swap = 1,
-		.order = order,
-		.priority = DEF_PRIORITY,
-		.target_mem_cgroup = NULL,
-		.nodemask = nodemask,
 	};
 
 	/*
@@ -2722,17 +2717,14 @@ unsigned long mem_cgroup_shrink_node_zone(struct mem_cgroup *memcg,
 						unsigned long *nr_scanned)
 {
 	struct scan_control sc = {
-		.nr_scanned = 0,
 		.nr_to_reclaim = SWAP_CLUSTER_MAX,
+		.target_mem_cgroup = memcg,
 		.may_writepage = !laptop_mode,
 		.may_unmap = 1,
 		.may_swap = !noswap,
-		.order = 0,
-		.priority = 0,
-		.swappiness = mem_cgroup_swappiness(memcg),
-		.target_mem_cgroup = memcg,
 	};
 	struct lruvec *lruvec = mem_cgroup_zone_lruvec(zone, memcg);
+	int swappiness = mem_cgroup_swappiness(memcg);
 
 	sc.gfp_mask = (gfp_mask & GFP_RECLAIM_MASK) |
 			(GFP_HIGHUSER_MOVABLE & ~GFP_RECLAIM_MASK);
@@ -2748,7 +2740,7 @@ unsigned long mem_cgroup_shrink_node_zone(struct mem_cgroup *memcg,
 	 * will pick up pages from other mem cgroup's as well. We hack
 	 * the priority and make it zero.
 	 */
-	shrink_lruvec(lruvec, &sc);
+	shrink_lruvec(lruvec, swappiness, &sc);
 
 	trace_mm_vmscan_memcg_softlimit_reclaim_end(sc.nr_reclaimed);
 
@@ -2764,16 +2756,14 @@ unsigned long try_to_free_mem_cgroup_pages(struct mem_cgroup *memcg,
 	unsigned long nr_reclaimed;
 	int nid;
 	struct scan_control sc = {
-		.may_writepage = !laptop_mode,
-		.may_unmap = 1,
-		.may_swap = !noswap,
 		.nr_to_reclaim = SWAP_CLUSTER_MAX,
-		.order = 0,
-		.priority = DEF_PRIORITY,
-		.target_mem_cgroup = memcg,
-		.nodemask = NULL, /* we don't care the placement */
 		.gfp_mask = (gfp_mask & GFP_RECLAIM_MASK) |
 				(GFP_HIGHUSER_MOVABLE & ~GFP_RECLAIM_MASK),
+		.target_mem_cgroup = memcg,
+		.priority = DEF_PRIORITY,
+		.may_writepage = !laptop_mode,
+		.may_unmap = 1,
+		.may_swap = !noswap,
 	};
 
 	/*
@@ -3031,12 +3021,11 @@ static unsigned long balance_pgdat(pg_data_t *pgdat, int order,
 	unsigned long nr_soft_scanned;
 	struct scan_control sc = {
 		.gfp_mask = GFP_KERNEL,
+		.order = order,
 		.priority = DEF_PRIORITY,
+		.may_writepage = !laptop_mode,
 		.may_unmap = 1,
 		.may_swap = 1,
-		.may_writepage = !laptop_mode,
-		.order = order,
-		.target_mem_cgroup = NULL,
 	};
 	count_vm_event(PAGEOUTRUN);
 
@@ -3417,14 +3406,13 @@ unsigned long shrink_all_memory(unsigned long nr_to_reclaim)
 {
 	struct reclaim_state reclaim_state;
 	struct scan_control sc = {
+		.nr_to_reclaim = nr_to_reclaim,
 		.gfp_mask = GFP_HIGHUSER_MOVABLE,
-		.may_swap = 1,
-		.may_unmap = 1,
+		.priority = DEF_PRIORITY,
 		.may_writepage = 1,
-		.nr_to_reclaim = nr_to_reclaim,
+		.may_unmap = 1,
+		.may_swap = 1,
 		.hibernation_mode = 1,
-		.order = 0,
-		.priority = DEF_PRIORITY,
 	};
 	struct zonelist *zonelist = node_zonelist(numa_node_id(), sc.gfp_mask);
 	struct task_struct *p = current;
@@ -3604,13 +3592,13 @@ static int __zone_reclaim(struct zone *zone, gfp_t gfp_mask, unsigned int order)
 	struct task_struct *p = current;
 	struct reclaim_state reclaim_state;
 	struct scan_control sc = {
-		.may_writepage = !!(zone_reclaim_mode & RECLAIM_WRITE),
-		.may_unmap = !!(zone_reclaim_mode & RECLAIM_SWAP),
-		.may_swap = 1,
 		.nr_to_reclaim = max(nr_pages, SWAP_CLUSTER_MAX),
 		.gfp_mask = (gfp_mask = memalloc_noio_flags(gfp_mask)),
 		.order = order,
 		.priority = ZONE_RECLAIM_PRIORITY,
+		.may_writepage = !!(zone_reclaim_mode & RECLAIM_WRITE),
+		.may_unmap = !!(zone_reclaim_mode & RECLAIM_SWAP),
+		.may_swap = 1,
 	};
 	struct shrink_control shrink = {
 		.gfp_mask = sc.gfp_mask,