The patch titled
Properly account for freed pages in free_pages_bulk() and when allocating high-order pages in buffered_rmqueue() V2
has been added to the -mm tree. Its filename is
page-allocator-update-nr_free_pages-only-as-necessary-fix.patch
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------------------------------------------------------
Subject: Properly account for freed pages in free_pages_bulk() and when allocating high-order pages in buffered_rmqueue() V2
From: Mel Gorman <mel@xxxxxxxxx>
free_pages_bulk() updates the number of free pages in the zone but it
is assuming that the pages being freed are order-0. While this is
currently always true, it's wrong to assume the order is 0. This patch
fixes the problem.
buffered_rmqueue() is not updating NR_FREE_PAGES when allocating pages
with __rmqueue(). As a result, high-order allocation will appear to
increase the number of free pages leading to the situation where the
free page count exceeds available RAM. This patch accounts for those
allocated pages properly.
This is a fix for page-allocator-update-nr_free_pages-only-as-necessary.patch.
Changelog since V1
o Change 1UL to 1 as it's unnecessary in this case to be unsigned long
Reported-by: Zhang, Yanmin <yanmin_zhang@xxxxxxxxxxxxxxx>
Signed-off-by: Mel Gorman <mel@xxxxxxxxx>
Cc: Christoph Lameter <cl@xxxxxxxxxxxxxxxxxxxx>
Cc: KOSAKI Motohiro <kosaki.motohiro@xxxxxxxxxxxxxx>
Cc: Pekka Enberg <penberg@xxxxxxxxxxxxxx>
Cc: Peter Zijlstra <a.p.zijlstra@xxxxxxxxx>
Cc: Nick Piggin <nickpiggin@xxxxxxxxxxxx>
Cc: Dave Hansen <dave@xxxxxxxxxxxxxxxxxx>
Cc: Lee Schermerhorn <Lee.Schermerhorn@xxxxxx>
Acked-by: Hugh Dickins <hugh@xxxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
mm/page_alloc.c | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)
diff -puN mm/page_alloc.c~page-allocator-update-nr_free_pages-only-as-necessary-fix mm/page_alloc.c
--- a/mm/page_alloc.c~page-allocator-update-nr_free_pages-only-as-necessary-fix
+++ a/mm/page_alloc.c
@@ -527,7 +527,7 @@ static void free_pages_bulk(struct zone
zone_clear_flag(zone, ZONE_ALL_UNRECLAIMABLE);
zone->pages_scanned = 0;
- __mod_zone_page_state(zone, NR_FREE_PAGES, count);
+ __mod_zone_page_state(zone, NR_FREE_PAGES, count << order);
while (count--) {
struct page *page;
@@ -1133,6 +1133,7 @@ again:
} else {
spin_lock_irqsave(&zone->lock, flags);
page = __rmqueue(zone, order, migratetype);
+ __mod_zone_page_state(zone, NR_FREE_PAGES, -(1 << order));
spin_unlock(&zone->lock);
if (!page)
goto failed;
_
Patches currently in -mm which might be from mel@xxxxxxxxx are
vmscan-low-order-lumpy-reclaim-also-should-use-pageout_io_sync.patch
page-allocator-replace-__alloc_pages_internal-with-__alloc_pages_nodemask.patch
page-allocator-do-not-sanity-check-order-in-the-fast-path.patch
page-allocator-do-not-sanity-check-order-in-the-fast-path-fix.patch
page-allocator-do-not-check-numa-node-id-when-the-caller-knows-the-node-is-valid.patch
page-allocator-check-only-once-if-the-zonelist-is-suitable-for-the-allocation.patch
page-allocator-break-up-the-allocator-entry-point-into-fast-and-slow-paths.patch
page-allocator-move-check-for-disabled-anti-fragmentation-out-of-fastpath.patch
page-allocator-calculate-the-preferred-zone-for-allocation-only-once.patch
page-allocator-calculate-the-preferred-zone-for-allocation-only-once-fix.patch
page-allocator-calculate-the-migratetype-for-allocation-only-once.patch
page-allocator-calculate-the-alloc_flags-for-allocation-only-once.patch
page-allocator-remove-a-branch-by-assuming-__gfp_high-==-alloc_high.patch
page-allocator-inline-__rmqueue_smallest.patch
page-allocator-inline-buffered_rmqueue.patch
page-allocator-inline-__rmqueue_fallback.patch
page-allocator-do-not-call-get_pageblock_migratetype-more-than-necessary.patch
page-allocator-do-not-disable-interrupts-in-free_page_mlock.patch
page-allocator-do-not-setup-zonelist-cache-when-there-is-only-one-node.patch
page-allocator-do-not-check-for-compound-pages-during-the-page-allocator-sanity-checks.patch
page-allocator-use-allocation-flags-as-an-index-to-the-zone-watermark.patch
page-allocator-update-nr_free_pages-only-as-necessary.patch
page-allocator-update-nr_free_pages-only-as-necessary-fix.patch
page-allocator-get-the-pageblock-migratetype-without-disabling-interrupts.patch
page-allocator-use-a-pre-calculated-value-instead-of-num_online_nodes-in-fast-paths.patch
page-allocator-use-a-pre-calculated-value-instead-of-num_online_nodes-in-fast-paths-do-not-override-definition-of-node_set_online-with-macro.patch
page-allocator-slab-use-nr_online_nodes-to-check-for-a-numa-platform.patch
page-allocator-move-free_page_mlock-to-page_allocc.patch
page-allocator-sanity-check-order-in-the-page-allocator-slow-path.patch
add-debugging-aid-for-memory-initialisation-problems.patch
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