patches/mm-convert-swap-to-percpu-locked.patch

From a0e106b941dd55f64386766669bc59fa4037f453 Mon Sep 17 00:00:00 2001
From: Ingo Molnar <mingo@elte.hu>
Date: Fri, 3 Jul 2009 08:29:51 -0500
Subject: [PATCH] mm/swap: Convert to percpu locked

Replace global locks (get_cpu + local_irq_save) with "local_locks()".
Currently there is one of for "rotate" and one for "swap".

Signed-off-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>

diff --git a/include/linux/swap.h b/include/linux/swap.h
index bcdefa817ed5..65de54b88964 100644
--- a/include/linux/swap.h
+++ b/include/linux/swap.h
@@ -269,6 +269,7 @@ extern unsigned long nr_free_pagecache_pages(void);
 
 
 /* linux/mm/swap.c */
+DECLARE_LOCAL_IRQ_LOCK(swapvec_lock);
 extern void lru_cache_add(struct page *);
 extern void lru_cache_add_anon(struct page *page);
 extern void lru_cache_add_file(struct page *page);
diff --git a/mm/compaction.c b/mm/compaction.c
index 09c5282ebdd2..caab6ed7f2b5 100644
--- a/mm/compaction.c
+++ b/mm/compaction.c
@@ -1601,10 +1601,12 @@ static enum compact_result compact_zone(struct zone *zone, struct compact_contro
 				block_start_pfn(cc->migrate_pfn, cc->order);
 
 			if (cc->last_migrated_pfn < current_block_start) {
-				cpu = get_cpu();
+				cpu = get_cpu_light();
+				local_lock_irq(swapvec_lock);
 				lru_add_drain_cpu(cpu);
+				local_unlock_irq(swapvec_lock);
 				drain_local_pages(zone);
-				put_cpu();
+				put_cpu_light();
 				/* No more flushing until we migrate again */
 				cc->last_migrated_pfn = 0;
 			}
diff --git a/mm/page_alloc.c b/mm/page_alloc.c
index eb8105747829..045a41ab88ce 100644
--- a/mm/page_alloc.c
+++ b/mm/page_alloc.c
@@ -6747,8 +6747,9 @@ void __init free_area_init(unsigned long *zones_size)
 
 static int page_alloc_cpu_dead(unsigned int cpu)
 {
-
+	local_lock_irq_on(swapvec_lock, cpu);
 	lru_add_drain_cpu(cpu);
+	local_unlock_irq_on(swapvec_lock, cpu);
 	drain_pages(cpu);
 
 	/*
diff --git a/mm/swap.c b/mm/swap.c
index 98d08b4579fa..e81fddc352f9 100644
--- a/mm/swap.c
+++ b/mm/swap.c
@@ -32,6 +32,7 @@
 #include <linux/memcontrol.h>
 #include <linux/gfp.h>
 #include <linux/uio.h>
+#include <linux/locallock.h>
 #include <linux/hugetlb.h>
 #include <linux/page_idle.h>
 
@@ -50,6 +51,8 @@ static DEFINE_PER_CPU(struct pagevec, lru_lazyfree_pvecs);
 #ifdef CONFIG_SMP
 static DEFINE_PER_CPU(struct pagevec, activate_page_pvecs);
 #endif
+static DEFINE_LOCAL_IRQ_LOCK(rotate_lock);
+DEFINE_LOCAL_IRQ_LOCK(swapvec_lock);
 
 /*
  * This path almost never happens for VM activity - pages are normally
@@ -252,11 +255,11 @@ void rotate_reclaimable_page(struct page *page)
 		unsigned long flags;
 
 		get_page(page);
-		local_irq_save(flags);
+		local_lock_irqsave(rotate_lock, flags);
 		pvec = this_cpu_ptr(&lru_rotate_pvecs);
 		if (!pagevec_add(pvec, page) || PageCompound(page))
 			pagevec_move_tail(pvec);
-		local_irq_restore(flags);
+		local_unlock_irqrestore(rotate_lock, flags);
 	}
 }
 
@@ -306,12 +309,13 @@ void activate_page(struct page *page)
 {
 	page = compound_head(page);
 	if (PageLRU(page) && !PageActive(page) && !PageUnevictable(page)) {
-		struct pagevec *pvec = &get_cpu_var(activate_page_pvecs);
+		struct pagevec *pvec = &get_locked_var(swapvec_lock,
+						       activate_page_pvecs);
 
 		get_page(page);
 		if (!pagevec_add(pvec, page) || PageCompound(page))
 			pagevec_lru_move_fn(pvec, __activate_page, NULL);
-		put_cpu_var(activate_page_pvecs);
+		put_locked_var(swapvec_lock, activate_page_pvecs);
 	}
 }
 
@@ -338,7 +342,7 @@ void activate_page(struct page *page)
 
 static void __lru_cache_activate_page(struct page *page)
 {
-	struct pagevec *pvec = &get_cpu_var(lru_add_pvec);
+	struct pagevec *pvec = &get_locked_var(swapvec_lock, lru_add_pvec);
 	int i;
 
 	/*
@@ -360,7 +364,7 @@ static void __lru_cache_activate_page(struct page *page)
 		}
 	}
 
-	put_cpu_var(lru_add_pvec);
+	put_locked_var(swapvec_lock, lru_add_pvec);
 }
 
 /*
@@ -402,12 +406,12 @@ EXPORT_SYMBOL(mark_page_accessed);
 
 static void __lru_cache_add(struct page *page)
 {
-	struct pagevec *pvec = &get_cpu_var(lru_add_pvec);
+	struct pagevec *pvec = &get_locked_var(swapvec_lock, lru_add_pvec);
 
 	get_page(page);
 	if (!pagevec_add(pvec, page) || PageCompound(page))
 		__pagevec_lru_add(pvec);
-	put_cpu_var(lru_add_pvec);
+	put_locked_var(swapvec_lock, lru_add_pvec);
 }
 
 /**
@@ -612,9 +616,9 @@ void lru_add_drain_cpu(int cpu)
 		unsigned long flags;
 
 		/* No harm done if a racing interrupt already did this */
-		local_irq_save(flags);
+		local_lock_irqsave(rotate_lock, flags);
 		pagevec_move_tail(pvec);
-		local_irq_restore(flags);
+		local_unlock_irqrestore(rotate_lock, flags);
 	}
 
 	pvec = &per_cpu(lru_deactivate_file_pvecs, cpu);
@@ -646,11 +650,12 @@ void deactivate_file_page(struct page *page)
 		return;
 
 	if (likely(get_page_unless_zero(page))) {
-		struct pagevec *pvec = &get_cpu_var(lru_deactivate_file_pvecs);
+		struct pagevec *pvec = &get_locked_var(swapvec_lock,
+						       lru_deactivate_file_pvecs);
 
 		if (!pagevec_add(pvec, page) || PageCompound(page))
 			pagevec_lru_move_fn(pvec, lru_deactivate_file_fn, NULL);
-		put_cpu_var(lru_deactivate_file_pvecs);
+		put_locked_var(swapvec_lock, lru_deactivate_file_pvecs);
 	}
 }
 
@@ -665,19 +670,20 @@ void mark_page_lazyfree(struct page *page)
 {
 	if (PageLRU(page) && PageAnon(page) && PageSwapBacked(page) &&
 	    !PageUnevictable(page)) {
-		struct pagevec *pvec = &get_cpu_var(lru_lazyfree_pvecs);
+		struct pagevec *pvec = &get_locked_var(swapvec_lock,
+						       lru_lazyfree_pvecs);
 
 		get_page(page);
 		if (!pagevec_add(pvec, page) || PageCompound(page))
 			pagevec_lru_move_fn(pvec, lru_lazyfree_fn, NULL);
-		put_cpu_var(lru_lazyfree_pvecs);
+		put_locked_var(swapvec_lock, lru_lazyfree_pvecs);
 	}
 }
 
 void lru_add_drain(void)
 {
-	lru_add_drain_cpu(get_cpu());
-	put_cpu();
+	lru_add_drain_cpu(local_lock_cpu(swapvec_lock));
+	local_unlock_cpu(swapvec_lock);
 }
 
 static void lru_add_drain_per_cpu(struct work_struct *dummy)
-- 
2.1.4