mm-quicklist-Convert-to-percpu-locked.patch

From 3c397d01a8c4299371f50192496ff1cd1fa8e552 Mon Sep 17 00:00:00 2001
From: Peter Zijlstra <peterz@infradead.org>
Date: Fri, 3 Jul 2009 08:44:05 -0500
Subject: [PATCH] mm: quicklist: Convert to percpu locked

commit 1578a2b7d1300f4e27cea087e6cdce9b8fbbcb4a in tip.

Use per cpu locked for quicklists as well to make the code
preemptible.

[ tglx: folded Ingo's "release before free page fix" ]

Signed-off-by: Peter Zijlstra <peterz@infradead.org>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Paul Gortmaker <paul.gortmaker@windriver.com>

diff --git a/include/linux/quicklist.h b/include/linux/quicklist.h
index bd46643..1bc3d46 100644
--- a/include/linux/quicklist.h
+++ b/include/linux/quicklist.h
@@ -18,7 +18,7 @@ struct quicklist {
 	int nr_pages;
 };
 
-DECLARE_PER_CPU(struct quicklist, quicklist)[CONFIG_NR_QUICK];
+DECLARE_PER_CPU_LOCKED(struct quicklist, quicklist)[CONFIG_NR_QUICK];
 
 /*
  * The two key functions quicklist_alloc and quicklist_free are inline so
@@ -30,19 +30,27 @@ DECLARE_PER_CPU(struct quicklist, quicklist)[CONFIG_NR_QUICK];
  * The fast patch in quicklist_alloc touched only a per cpu cacheline and
  * the first cacheline of the page itself. There is minmal overhead involved.
  */
-static inline void *quicklist_alloc(int nr, gfp_t flags, void (*ctor)(void *))
+static inline void *__quicklist_alloc(struct quicklist *q)
 {
-	struct quicklist *q;
-	void **p = NULL;
+	void **p = q->page;
 
-	q =&get_cpu_var(quicklist)[nr];
-	p = q->page;
 	if (likely(p)) {
 		q->page = p[0];
 		p[0] = NULL;
 		q->nr_pages--;
 	}
-	put_cpu_var(quicklist);
+	return p;
+}
+
+static inline void *quicklist_alloc(int nr, gfp_t flags, void (*ctor)(void *))
+{
+	struct quicklist *q;
+	void **p;
+	int cpu;
+
+	q = &get_cpu_var_locked(quicklist, &cpu)[nr];
+	p = __quicklist_alloc(q);
+	put_cpu_var_locked(quicklist, cpu);
 	if (likely(p))
 		return p;
 
@@ -56,12 +64,13 @@ static inline void __quicklist_free(int nr, void (*dtor)(void *), void *p,
 	struct page *page)
 {
 	struct quicklist *q;
+	int cpu;
 
-	q = &get_cpu_var(quicklist)[nr];
+	q = &get_cpu_var_locked(quicklist, &cpu)[nr];
 	*(void **)p = q->page;
 	q->page = p;
 	q->nr_pages++;
-	put_cpu_var(quicklist);
+	put_cpu_var_locked(quicklist, cpu);
 }
 
 static inline void quicklist_free(int nr, void (*dtor)(void *), void *pp)
diff --git a/mm/quicklist.c b/mm/quicklist.c
index 6633965..b6fb023 100644
--- a/mm/quicklist.c
+++ b/mm/quicklist.c
@@ -19,7 +19,7 @@
 #include <linux/module.h>
 #include <linux/quicklist.h>
 
-DEFINE_PER_CPU(struct quicklist [CONFIG_NR_QUICK], quicklist);
+DEFINE_PER_CPU_LOCKED(struct quicklist [CONFIG_NR_QUICK], quicklist);
 
 #define FRACTION_OF_NODE_MEM	16
 
@@ -65,17 +65,14 @@ void quicklist_trim(int nr, void (*dtor)(void *),
 {
 	long pages_to_free;
 	struct quicklist *q;
+	int cpu;
 
-	q = &get_cpu_var(quicklist)[nr];
+	q = &get_cpu_var_locked(quicklist, &cpu)[nr];
 	if (q->nr_pages > min_pages) {
 		pages_to_free = min_pages_to_free(q, min_pages, max_free);
 
 		while (pages_to_free > 0) {
-			/*
-			 * We pass a gfp_t of 0 to quicklist_alloc here
-			 * because we will never call into the page allocator.
-			 */
-			void *p = quicklist_alloc(nr, 0, NULL);
+			void *p = __quicklist_alloc(q);
 
 			if (dtor)
 				dtor(p);
@@ -83,7 +80,7 @@ void quicklist_trim(int nr, void (*dtor)(void *),
 			pages_to_free--;
 		}
 	}
-	put_cpu_var(quicklist);
+	put_cpu_var_locked(quicklist, cpu);
 }
 
 unsigned long quicklist_total_size(void)
@@ -93,7 +90,7 @@ unsigned long quicklist_total_size(void)
 	struct quicklist *ql, *q;
 
 	for_each_online_cpu(cpu) {
-		ql = per_cpu(quicklist, cpu);
+		ql = per_cpu_var_locked(quicklist, cpu);
 		for (q = ql; q < ql + CONFIG_NR_QUICK; q++)
 			count += q->nr_pages;
 	}
-- 
1.7.1.1