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From: Mel Gorman <mel@csn.ul.ie>
To: akpm@linux-foundation.org
Cc: Mel Gorman <mel@csn.ul.ie>,
linux-kernel@vger.kernel.org, linux-mm@kvack.org
Subject: [PATCH 12/12] Be more agressive about stealing when MIGRATE_RECLAIMABLE allocations fallback
Date: Thu, 1 Mar 2007 10:06:30 +0000 (GMT) [thread overview]
Message-ID: <20070301100630.29753.64743.sendpatchset@skynet.skynet.ie> (raw)
In-Reply-To: <20070301100229.29753.86342.sendpatchset@skynet.skynet.ie>
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 <mel@csn.ul.ie>
---
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 */
prev parent reply other threads:[~2007-03-01 10:06 UTC|newest]
Thread overview: 13+ messages / expand[flat|nested] mbox.gz Atom feed top
2007-03-01 10:02 [PATCH 0/12] Group pages of related mobility together to reduce external fragmentation v28 Mel Gorman
2007-03-01 10:02 ` [PATCH 1/12] Add a bitmap that is used to track flags affecting a block of pages Mel Gorman
2007-03-01 10:03 ` [PATCH 2/12] Add __GFP_MOVABLE for callers to flag allocations from high memory that may be migrated Mel Gorman
2007-03-01 10:03 ` [PATCH 3/12] Add __GFP_MOVABLE for callers to flag allocations from low " Mel Gorman
2007-03-01 10:03 ` [PATCH 4/12] Split the free lists for movable and unmovable allocations Mel Gorman
2007-03-01 10:04 ` [PATCH 5/12] Choose pages from the per-cpu list based on migration type Mel Gorman
2007-03-01 10:04 ` [PATCH 6/12] Add a configure option to group pages by mobility Mel Gorman
2007-03-01 10:04 ` [PATCH 7/12] Drain per-cpu lists when high-order allocations fail Mel Gorman
2007-03-01 10:05 ` [PATCH 8/12] Move free pages between lists on steal Mel Gorman
2007-03-01 10:05 ` [PATCH 9/12] Group short-lived and reclaimable kernel allocations Mel Gorman
2007-03-01 10:05 ` [PATCH 10/12] Group high-order atomic allocations Mel Gorman
2007-03-01 10:06 ` [PATCH 11/12] Bias the placement of kernel pages at lower PFNs Mel Gorman
2007-03-01 10:06 ` Mel Gorman [this message]
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