From 5c105d9f3fd086aff195d3849dcf847d6b0bd927 Mon Sep 17 00:00:00 2001 From: blogic Date: Fri, 5 Oct 2012 10:12:53 +0000 Subject: branch Attitude Adjustment git-svn-id: svn://svn.openwrt.org/openwrt/branches/attitude_adjustment@33625 3c298f89-4303-0410-b956-a3cf2f4a3e73 --- ...f-any-page-in-a-pageblock-is-reserved-bef.patch | 45 ++++++++++++++++++++++ 1 file changed, 45 insertions(+) create mode 100644 target/linux/goldfish/patches-2.6.30/0056-mm-Check-if-any-page-in-a-pageblock-is-reserved-bef.patch (limited to 'target/linux/goldfish/patches-2.6.30/0056-mm-Check-if-any-page-in-a-pageblock-is-reserved-bef.patch') diff --git a/target/linux/goldfish/patches-2.6.30/0056-mm-Check-if-any-page-in-a-pageblock-is-reserved-bef.patch b/target/linux/goldfish/patches-2.6.30/0056-mm-Check-if-any-page-in-a-pageblock-is-reserved-bef.patch new file mode 100644 index 000000000..ce1fb71ea --- /dev/null +++ b/target/linux/goldfish/patches-2.6.30/0056-mm-Check-if-any-page-in-a-pageblock-is-reserved-bef.patch @@ -0,0 +1,45 @@ +From a4eb204a8029320c2dd748daf4f51fd48d337c3d Mon Sep 17 00:00:00 2001 +From: =?utf-8?q?Arve=20Hj=C3=B8nnev=C3=A5g?= +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); -- cgit v1.2.3