linux-kernel - Re: [this_cpu_xx V4 13/20] this_cpu

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Date:	Mon, 5 Oct 2009 10:55:49 -0400 (EDT)
From:	Christoph Lameter <cl@...ux-foundation.org>
To:	Mel Gorman <mel@....ul.ie>
cc:	akpm@...ux-foundation.org, linux-kernel@...r.kernel.org,
	Tejun Heo <tj@...nel.org>, mingo@...e.hu,
	rusty@...tcorp.com.au, Pekka Enberg <penberg@...helsinki.fi>
Subject: Re: [this_cpu_xx V4 13/20] this_cpu_ops: page allocator conversion


Changes to this patch so far:

Index: linux-2.6/mm/page_alloc.c
===================================================================
--- linux-2.6.orig/mm/page_alloc.c	2009-10-05 09:49:07.000000000 -0500
+++ linux-2.6/mm/page_alloc.c	2009-10-05 09:48:43.000000000 -0500
@@ -1098,8 +1098,6 @@ static void free_hot_cold_page(struct pa
 	arch_free_page(page, 0);
 	kernel_map_pages(page, 1, 0);

-	local_irq_save(flags);
-	pcp = &this_cpu_ptr(zone->pageset)->pcp;
 	migratetype = get_pageblock_migratetype(page);
 	set_page_private(page, migratetype);
 	if (unlikely(wasMlocked))
@@ -1121,6 +1119,8 @@ static void free_hot_cold_page(struct pa
 		migratetype = MIGRATE_MOVABLE;
 	}

+	local_irq_save(flags);
+	pcp = &this_cpu_ptr(zone->pageset)->pcp;
 	if (cold)
 		list_add_tail(&page->lru, &pcp->lists[migratetype]);
 	else
@@ -3120,7 +3120,8 @@ static struct notifier_block __cpuinitda
 /*
  * Allocate per cpu pagesets and initialize them.
  * Before this call only boot pagesets were available.
- * Boot pagesets will no longer be used after this call is complete.
+ * Boot pagesets will no longer be used by this processorr
+ * after setup_per_cpu_pageset().
  */
 void __init setup_per_cpu_pageset(void)
 {
@@ -3232,11 +3233,11 @@ __meminit void setup_pagesets(void)
 		zone->pageset = &per_cpu_var(boot_pageset);

 		/*
-		 * Special pagesets with zero elements so that frees
+		 * Special pagesets with one element so that frees
 		 * and allocations are not buffered at all.
 		 */
 		for_each_possible_cpu(cpu)
-			setup_pageset(per_cpu_ptr(zone->pageset, cpu), 0);
+			setup_pageset(per_cpu_ptr(zone->pageset, cpu), 1);

 	}
 }

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