---

yaml --- r: 164450 b: refs/heads/master c: 78986a6 h: refs/heads/master v: v3
git-mirror · Sep 22, 2009 · a6e1ddf · a6e1ddf
1 parent 27f9875
commit a6e1ddf
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Showing 2 changed files with 12 additions and 2 deletions.
diff --git a/[refs] b/[refs]
@@ -1,2 +1,2 @@
 ---
-refs/heads/master: ceddc3a52d783fabbf1ba623601419b9d6337194
+refs/heads/master: 78986a678f6ec3759a01976749f4437d8bf2d6c3
diff --git a/trunk/mm/page_alloc.c b/trunk/mm/page_alloc.c
@@ -2836,14 +2836,24 @@ static void setup_zone_migrate_reserve(struct zone *zone)
 {
 	unsigned long start_pfn, pfn, end_pfn;
 	struct page *page;
-	unsigned long reserve, block_migratetype;
+	unsigned long block_migratetype;
+	int reserve;
 
 	/* Get the start pfn, end pfn and the number of blocks to reserve */
 	start_pfn = zone->zone_start_pfn;
 	end_pfn = start_pfn + zone->spanned_pages;
 	reserve = roundup(min_wmark_pages(zone), pageblock_nr_pages) >>
 							pageblock_order;
 
+	/*
+	 * Reserve blocks are generally in place to help high-order atomic
+	 * allocations that are short-lived. A min_free_kbytes value that
+	 * would result in more than 2 reserve blocks for atomic allocations
+	 * is assumed to be in place to help anti-fragmentation for the
+	 * future allocation of hugepages at runtime.
+	 */
+	reserve = min(2, reserve);
+
 	for (pfn = start_pfn; pfn < end_pfn; pfn += pageblock_nr_pages) {
 		if (!pfn_valid(pfn))
 			continue;