From mboxrd@z Thu Jan 1 00:00:00 1970 From: Mel Gorman Message-Id: <20070301100630.29753.64743.sendpatchset@skynet.skynet.ie> In-Reply-To: <20070301100229.29753.86342.sendpatchset@skynet.skynet.ie> References: <20070301100229.29753.86342.sendpatchset@skynet.skynet.ie> Subject: [PATCH 12/12] Be more agressive about stealing when MIGRATE_RECLAIMABLE allocations fallback Date: Thu, 1 Mar 2007 10:06:30 +0000 (GMT) Sender: owner-linux-mm@kvack.org Return-Path: To: akpm@linux-foundation.org Cc: Mel Gorman , linux-kernel@vger.kernel.org, linux-mm@kvack.org List-ID: MIGRATE_RECLAIMABLE allocations tend to be very bursty in nature like when updatedb starts. It is likely this will occur in situations where MAX_ORDER blocks of pages are not free. This means that updatedb can scatter MIGRATE_RECLAIMABLE pages throughout the address space. This patch is more agressive about stealing blocks of pages for MIGRATE_RECLAIMABLE. Signed-off-by: Mel Gorman --- page_alloc.c | 18 +++++++++++++++--- 1 files changed, 15 insertions(+), 3 deletions(-) diff -rup -X /usr/src/patchset-0.6/bin//dontdiff linux-2.6.20-mm2-011_biasplacement/mm/page_alloc.c linux-2.6.20-mm2-012_grabbyreclaim/mm/page_alloc.c --- linux-2.6.20-mm2-011_biasplacement/mm/page_alloc.c 2007-02-20 18:52:18.000000000 +0000 +++ linux-2.6.20-mm2-012_grabbyreclaim/mm/page_alloc.c 2007-02-20 18:54:35.000000000 +0000 @@ -806,11 +806,23 @@ retry: /* * If breaking a large block of pages, move all free - * pages to the preferred allocation list + * pages to the preferred allocation list. If falling + * back for a reclaimable kernel allocation, be more + * agressive about taking ownership of free pages */ - if (unlikely(current_order >= MAX_ORDER / 2)) { + if (unlikely(current_order >= MAX_ORDER / 2) || + start_migratetype == MIGRATE_RECLAIMABLE) { + unsigned long pages; + pages = move_freepages_block(zone, page, + start_migratetype); + + /* Claim the whole block if over half of it is free */ + if ((pages << current_order) >= (1 << (MAX_ORDER-2)) && + migratetype != MIGRATE_HIGHATOMIC) + set_pageblock_migratetype(page, + start_migratetype); + migratetype = start_migratetype; - move_freepages_block(zone, page, migratetype); } /* Remove the page from the freelists */ -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@kvack.org. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: email@kvack.org