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