mirror of
git://projects.qi-hardware.com/openwrt-xburst.git
synced 2024-11-14 13:47:10 +02:00
61a476da4d
git-svn-id: svn://svn.openwrt.org/openwrt/trunk@17804 3c298f89-4303-0410-b956-a3cf2f4a3e73
46 lines
1.6 KiB
Diff
46 lines
1.6 KiB
Diff
From a4eb204a8029320c2dd748daf4f51fd48d337c3d Mon Sep 17 00:00:00 2001
|
|
From: =?utf-8?q?Arve=20Hj=C3=B8nnev=C3=A5g?= <arve@android.com>
|
|
Date: Wed, 18 Mar 2009 17:27:31 -0700
|
|
Subject: [PATCH 056/134] mm: Check if any page in a pageblock is reserved before marking it MIGRATE_RESERVE
|
|
|
|
This fixes a problem where the first pageblock got marked MIGRATE_RESERVE even
|
|
though it only had a few free pages. This in turn caused no contiguous memory
|
|
to be reserved and frequent kswapd wakeups that emptied the caches to get more
|
|
contiguous memory.
|
|
---
|
|
mm/page_alloc.c | 16 +++++++++++++++-
|
|
1 files changed, 15 insertions(+), 1 deletions(-)
|
|
|
|
--- a/mm/page_alloc.c
|
|
+++ b/mm/page_alloc.c
|
|
@@ -2570,6 +2570,20 @@ static inline unsigned long wait_table_b
|
|
#define LONG_ALIGN(x) (((x)+(sizeof(long))-1)&~((sizeof(long))-1))
|
|
|
|
/*
|
|
+ * Check if a pageblock contains reserved pages
|
|
+ */
|
|
+static int pageblock_is_reserved(unsigned long start_pfn)
|
|
+{
|
|
+ unsigned long end_pfn = start_pfn + pageblock_nr_pages;
|
|
+ unsigned long pfn;
|
|
+
|
|
+ for (pfn = start_pfn; pfn < end_pfn; pfn++)
|
|
+ if (PageReserved(pfn_to_page(pfn)))
|
|
+ return 1;
|
|
+ return 0;
|
|
+}
|
|
+
|
|
+/*
|
|
* Mark a number of pageblocks as MIGRATE_RESERVE. The number
|
|
* of blocks reserved is based on zone->pages_min. The memory within the
|
|
* reserve will tend to store contiguous free pages. Setting min_free_kbytes
|
|
@@ -2598,7 +2612,7 @@ static void setup_zone_migrate_reserve(s
|
|
continue;
|
|
|
|
/* Blocks with reserved pages will never free, skip them. */
|
|
- if (PageReserved(page))
|
|
+ if (pageblock_is_reserved(pfn))
|
|
continue;
|
|
|
|
block_migratetype = get_pageblock_migratetype(page);
|