Subject: + mm-thp-avoid-excessive-compaction-latency-during-fault-fix.patch added to -mm tree
To: rientjes@xxxxxxxxxx,gthelen@xxxxxxxxxx,hughd@xxxxxxxxxx,mgorman@xxxxxxx,n-horiguchi@xxxxxxxxxxxxx,vbabka@xxxxxxx
From: akpm@xxxxxxxxxxxxxxxxxxxx
Date: Thu, 08 May 2014 15:36:08 -0700
The patch titled
Subject: mm, thp: avoid excessive compaction latency during fault fix
has been added to the -mm tree. Its filename is
mm-thp-avoid-excessive-compaction-latency-during-fault-fix.patch
This patch should soon appear at
http://ozlabs.org/~akpm/mmots/broken-out/mm-thp-avoid-excessive-compaction-latency-during-fault-fix.patch
and later at
http://ozlabs.org/~akpm/mmotm/broken-out/mm-thp-avoid-excessive-compaction-latency-during-fault-fix.patch
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------------------------------------------------------
From: David Rientjes <rientjes@xxxxxxxxxx>
Subject: mm, thp: avoid excessive compaction latency during fault fix
mm-thp-avoid-excessive-compaction-latency-during-fault.patch excludes sync
compaction for all high order allocations other than thp. What we really
want to do is suppress sync compaction for thp, but only during the page
fault path.
Orders greater than PAGE_ALLOC_COSTLY_ORDER aren't necessarily going to
loop again so this is the only way to exhaust our capabilities before
declaring that we can't allocate.
Signed-off-by: David Rientjes <rientjes@xxxxxxxxxx>
Reported-by: Hugh Dickins <hughd@xxxxxxxxxx>
Cc: Mel Gorman <mgorman@xxxxxxx>
Cc: Greg Thelen <gthelen@xxxxxxxxxx>
Cc: Naoya Horiguchi <n-horiguchi@xxxxxxxxxxxxx>
Cc: Vlastimil Babka <vbabka@xxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
mm/page_alloc.c | 17 +++++++----------
1 file changed, 7 insertions(+), 10 deletions(-)
diff -puN mm/page_alloc.c~mm-thp-avoid-excessive-compaction-latency-during-fault-fix mm/page_alloc.c
--- a/mm/page_alloc.c~mm-thp-avoid-excessive-compaction-latency-during-fault-fix
+++ a/mm/page_alloc.c
@@ -2576,16 +2576,13 @@ rebalance:
if (page)
goto got_pg;
- if (gfp_mask & __GFP_NO_KSWAPD) {
- /*
- * Khugepaged is allowed to try MIGRATE_SYNC_LIGHT, the latency
- * of this allocation isn't critical. Everything else, however,
- * should only be allowed to do MIGRATE_ASYNC to avoid excessive
- * stalls during fault.
- */
- if ((current->flags & (PF_KTHREAD | PF_KSWAPD)) == PF_KTHREAD)
- migration_mode = MIGRATE_SYNC_LIGHT;
- }
+ /*
+ * It can become very expensive to allocate transparent hugepages at
+ * fault, so use asynchronous memory compaction for THP unless it is
+ * khugepaged trying to collapse.
+ */
+ if (!(gfp_mask & __GFP_NO_KSWAPD) || (current->flags & PF_KTHREAD))
+ migration_mode = MIGRATE_SYNC_LIGHT;
/*
* If compaction is deferred for high-order allocations, it is because
_
Patches currently in -mm which might be from rientjes@xxxxxxxxxx are
mm-slab-suppress-out-of-memory-warning-unless-debug-is-enabled.patch
mm-memcontrol-remove-hierarchy-restrictions-for-swappiness-and-oom_control.patch
mm-memcontrol-remove-hierarchy-restrictions-for-swappiness-and-oom_control-fix.patch
hugetlb-prep_compound_gigantic_page-drop-__init-marker.patch
hugetlb-add-hstate_is_gigantic.patch
hugetlb-update_and_free_page-dont-clear-pg_reserved-bit.patch
hugetlb-move-helpers-up-in-the-file.patch
hugetlb-add-support-for-gigantic-page-allocation-at-runtime.patch
mem-hotplug-implement-get-put_online_mems.patch
slab-get_online_mems-for-kmem_cache_createdestroyshrink.patch
mm-debug-make-bad_range-output-more-usable-and-readable.patch
memcg-do-not-hang-on-oom-when-killed-by-userspace-oom-access-to-memory-reserves.patch
mm-migration-add-destination-page-freeing-callback.patch
mm-compaction-return-failed-migration-target-pages-back-to-freelist.patch
mm-compaction-add-per-zone-migration-pfn-cache-for-async-compaction.patch
mm-compaction-embed-migration-mode-in-compact_control.patch
mm-thp-avoid-excessive-compaction-latency-during-fault.patch
mm-thp-avoid-excessive-compaction-latency-during-fault-fix.patch
mm-compaction-terminate-async-compaction-when-rescheduling.patch
mm-compaction-do-not-count-migratepages-when-unnecessary.patch
mm-compaction-avoid-rescanning-pageblocks-in-isolate_freepages.patch
mm-utilc-add-kstrimdup.patch
linux-next.patch
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