1 files changed, 97 insertions, 21 deletions

diff --git a/mm/page_alloc.c b/mm/page_alloc.c
index 2a137cd121e3..8a07916aa274 100644
--- a/mm/page_alloc.c
+++ b/mm/page_alloc.c
@@ -133,6 +133,20 @@ static DEFINE_PER_CPU(struct pagesets, pagesets) = {
 	.lock = INIT_LOCAL_LOCK(lock),
 };
 
+#if defined(CONFIG_SMP) || defined(CONFIG_PREEMPT_RT)
+/*
+ * On SMP, spin_trylock is sufficient protection.
+ * On PREEMPT_RT, spin_trylock is equivalent on both SMP and UP.
+ */
+#define pcp_trylock_prepare(flags)	do { } while (0)
+#define pcp_trylock_finish(flag)	do { } while (0)
+#else
+
+/* UP spin_trylock always succeeds so disable IRQs to prevent re-entrancy. */
+#define pcp_trylock_prepare(flags)	local_irq_save(flags)
+#define pcp_trylock_finish(flags)	local_irq_restore(flags)
+#endif
+
 #ifdef CONFIG_USE_PERCPU_NUMA_NODE_ID
 DEFINE_PER_CPU(int, numa_node);
 EXPORT_PER_CPU_SYMBOL(numa_node);
@@ -3101,15 +3115,22 @@ static int rmqueue_bulk(struct zone *zone, unsigned int order,
  */
 void drain_zone_pages(struct zone *zone, struct per_cpu_pages *pcp)
 {
-	unsigned long flags;
 	int to_drain, batch;
 
-	local_lock_irqsave(&pagesets.lock, flags);
 	batch = READ_ONCE(pcp->batch);
 	to_drain = min(pcp->count, batch);
-	if (to_drain > 0)
+	if (to_drain > 0) {
+		unsigned long flags;
+
+		/*
+		 * free_pcppages_bulk expects IRQs disabled for zone->lock
+		 * so even though pcp->lock is not intended to be IRQ-safe,
+		 * it's needed in this context.
+		 */
+		spin_lock_irqsave(&pcp->lock, flags);
 		free_pcppages_bulk(zone, to_drain, pcp, 0);
-	local_unlock_irqrestore(&pagesets.lock, flags);
+		spin_unlock_irqrestore(&pcp->lock, flags);
+	}
 }
 #endif
 
@@ -3122,16 +3143,17 @@ void drain_zone_pages(struct zone *zone, struct per_cpu_pages *pcp)
  */
 static void drain_pages_zone(unsigned int cpu, struct zone *zone)
 {
-	unsigned long flags;
 	struct per_cpu_pages *pcp;
 
-	local_lock_irqsave(&pagesets.lock, flags);
-
 	pcp = per_cpu_ptr(zone->per_cpu_pageset, cpu);
-	if (pcp->count)
-		free_pcppages_bulk(zone, pcp->count, pcp, 0);
+	if (pcp->count) {
+		unsigned long flags;
 
-	local_unlock_irqrestore(&pagesets.lock, flags);
+		/* See drain_zone_pages on why this is disabling IRQs */
+		spin_lock_irqsave(&pcp->lock, flags);
+		free_pcppages_bulk(zone, pcp->count, pcp, 0);
+		spin_unlock_irqrestore(&pcp->lock, flags);
+	}
 }
 
 /*
@@ -3399,17 +3421,15 @@ static int nr_pcp_high(struct per_cpu_pages *pcp, struct zone *zone,
 	return min(READ_ONCE(pcp->batch) << 2, high);
 }
 
-static void free_unref_page_commit(struct page *page, int migratetype,
+static void free_unref_page_commit(struct zone *zone, struct per_cpu_pages *pcp,
+				   struct page *page, int migratetype,
 				   unsigned int order)
 {
-	struct zone *zone = page_zone(page);
-	struct per_cpu_pages *pcp;
 	int high;
 	int pindex;
 	bool free_high;
 
 	__count_vm_event(PGFREE);
-	pcp = this_cpu_ptr(zone->per_cpu_pageset);
 	pindex = order_to_pindex(migratetype, order);
 	list_add(&page->pcp_list, &pcp->lists[pindex]);
 	pcp->count += 1 << order;
@@ -3436,6 +3456,9 @@ static void free_unref_page_commit(struct page *page, int migratetype,
 void free_unref_page(struct page *page, unsigned int order)
 {
 	unsigned long flags;
+	unsigned long __maybe_unused UP_flags;
+	struct per_cpu_pages *pcp;
+	struct zone *zone;
 	unsigned long pfn = page_to_pfn(page);
 	int migratetype;
 
@@ -3459,7 +3482,16 @@ void free_unref_page(struct page *page, unsigned int order)
 	}
 
 	local_lock_irqsave(&pagesets.lock, flags);
-	free_unref_page_commit(page, migratetype, order);
+	zone = page_zone(page);
+	pcp_trylock_prepare(UP_flags);
+	pcp = this_cpu_ptr(zone->per_cpu_pageset);
+	if (spin_trylock(&pcp->lock)) {
+		free_unref_page_commit(zone, pcp, page, migratetype, order);
+		spin_unlock(&pcp->lock);
+	} else {
+		free_one_page(zone, page, pfn, order, migratetype, FPI_NONE);
+	}
+	pcp_trylock_finish(UP_flags);
 	local_unlock_irqrestore(&pagesets.lock, flags);
 }
 
@@ -3469,6 +3501,8 @@ void free_unref_page(struct page *page, unsigned int order)
 void free_unref_page_list(struct list_head *list)
 {
 	struct page *page, *next;
+	struct per_cpu_pages *pcp = NULL;
+	struct zone *locked_zone = NULL;
 	unsigned long flags;
 	int batch_count = 0;
 	int migratetype;
@@ -3495,6 +3529,17 @@ void free_unref_page_list(struct list_head *list)
 
 	local_lock_irqsave(&pagesets.lock, flags);
 	list_for_each_entry_safe(page, next, list, lru) {
+		struct zone *zone = page_zone(page);
+
+		/* Different zone, different pcp lock. */
+		if (zone != locked_zone) {
+			if (pcp)
+				spin_unlock(&pcp->lock);
+			locked_zone = zone;
+			pcp = this_cpu_ptr(zone->per_cpu_pageset);
+			spin_lock(&pcp->lock);
+		}
+
 		/*
 		 * Non-isolated types over MIGRATE_PCPTYPES get added
 		 * to the MIGRATE_MOVABLE pcp list.
@@ -3504,18 +3549,24 @@ void free_unref_page_list(struct list_head *list)
 			migratetype = MIGRATE_MOVABLE;
 
 		trace_mm_page_free_batched(page);
-		free_unref_page_commit(page, migratetype, 0);
+		free_unref_page_commit(zone, pcp, page, migratetype, 0);
 
 		/*
 		 * Guard against excessive IRQ disabled times when we get
 		 * a large list of pages to free.
 		 */
 		if (++batch_count == SWAP_CLUSTER_MAX) {
+			spin_unlock(&pcp->lock);
 			local_unlock_irqrestore(&pagesets.lock, flags);
 			batch_count = 0;
 			local_lock_irqsave(&pagesets.lock, flags);
+			pcp = this_cpu_ptr(locked_zone->per_cpu_pageset);
+			spin_lock(&pcp->lock);
 		}
 	}
+
+	if (pcp)
+		spin_unlock(&pcp->lock);
 	local_unlock_irqrestore(&pagesets.lock, flags);
 }
 
@@ -3729,18 +3780,31 @@ static struct page *rmqueue_pcplist(struct zone *preferred_zone,
 	struct list_head *list;
 	struct page *page;
 	unsigned long flags;
+	unsigned long __maybe_unused UP_flags;
 
 	local_lock_irqsave(&pagesets.lock, flags);
 
 	/*
+	 * spin_trylock may fail due to a parallel drain. In the future, the
+	 * trylock will also protect against IRQ reentrancy.
+	 */
+	pcp = this_cpu_ptr(zone->per_cpu_pageset);
+	pcp_trylock_prepare(UP_flags);
+	if (!spin_trylock(&pcp->lock)) {
+		pcp_trylock_finish(UP_flags);
+		return NULL;
+	}
+
+	/*
 	 * On allocation, reduce the number of pages that are batch freed.
 	 * See nr_pcp_free() where free_factor is increased for subsequent
 	 * frees.
 	 */
-	pcp = this_cpu_ptr(zone->per_cpu_pageset);
 	pcp->free_factor >>= 1;
 	list = &pcp->lists[order_to_pindex(migratetype, order)];
 	page = __rmqueue_pcplist(zone, order, migratetype, alloc_flags, pcp, list);
+	spin_unlock(&pcp->lock);
+	pcp_trylock_finish(UP_flags);
 	local_unlock_irqrestore(&pagesets.lock, flags);
 	if (page) {
 		__count_zid_vm_events(PGALLOC, page_zonenum(page), 1);
@@ -3775,7 +3839,8 @@ struct page *rmqueue(struct zone *preferred_zone,
 				migratetype != MIGRATE_MOVABLE) {
 			page = rmqueue_pcplist(preferred_zone, zone, order,
 					gfp_flags, migratetype, alloc_flags);
-			goto out;
+			if (likely(page))
+				goto out;
 		}
 	}
 
@@ -5252,6 +5317,7 @@ unsigned long __alloc_pages_bulk(gfp_t gfp, int preferred_nid,
 {
 	struct page *page;
 	unsigned long flags;
+	unsigned long __maybe_unused UP_flags;
 	struct zone *zone;
 	struct zoneref *z;
 	struct per_cpu_pages *pcp;
@@ -5332,11 +5398,15 @@ unsigned long __alloc_pages_bulk(gfp_t gfp, int preferred_nid,
 	if (unlikely(!zone))
 		goto failed;
 
-	/* Attempt the batch allocation */
+	/* Is a parallel drain in progress? */
 	local_lock_irqsave(&pagesets.lock, flags);
+	pcp_trylock_prepare(UP_flags);
 	pcp = this_cpu_ptr(zone->per_cpu_pageset);
-	pcp_list = &pcp->lists[order_to_pindex(ac.migratetype, 0)];
+	if (!spin_trylock(&pcp->lock))
+		goto failed_irq;
 
+	/* Attempt the batch allocation */
+	pcp_list = &pcp->lists[order_to_pindex(ac.migratetype, 0)];
 	while (nr_populated < nr_pages) {
 
 		/* Skip existing pages */
@@ -5349,8 +5419,10 @@ unsigned long __alloc_pages_bulk(gfp_t gfp, int preferred_nid,
 								pcp, pcp_list);
 		if (unlikely(!page)) {
 			/* Try and allocate at least one page */
-			if (!nr_account)
+			if (!nr_account) {
+				spin_unlock(&pcp->lock);
 				goto failed_irq;
+			}
 			break;
 		}
 		nr_account++;
@@ -5363,6 +5435,8 @@ unsigned long __alloc_pages_bulk(gfp_t gfp, int preferred_nid,
 		nr_populated++;
 	}
 
+	spin_unlock(&pcp->lock);
+	pcp_trylock_finish(UP_flags);
 	local_unlock_irqrestore(&pagesets.lock, flags);
 
 	__count_zid_vm_events(PGALLOC, zone_idx(zone), nr_account);
@@ -5372,6 +5446,7 @@ out:
 	return nr_populated;
 
 failed_irq:
+	pcp_trylock_finish(UP_flags);
 	local_unlock_irqrestore(&pagesets.lock, flags);
 
 failed:
@@ -7017,6 +7092,7 @@ static void per_cpu_pages_init(struct per_cpu_pages *pcp, struct per_cpu_zonesta
 	memset(pcp, 0, sizeof(*pcp));
 	memset(pzstats, 0, sizeof(*pzstats));
 
+	spin_lock_init(&pcp->lock);
 	for (pindex = 0; pindex < NR_PCP_LISTS; pindex++)
 		INIT_LIST_HEAD(&pcp->lists[pindex]);