The patch titled
Subject: mm: vmscan: do not OOM if aborting reclaim to start compaction
has been added to the -mm tree. Its filename is
mm-vmscan-do-not-oom-if-aborting-reclaim-to-start-compaction.patch
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------------------------------------------------------
From: Mel Gorman <mgorman@xxxxxxx>
Subject: mm: vmscan: do not OOM if aborting reclaim to start compaction
During direct reclaim it is possible that reclaim will be aborted so that
compaction can be attempted to satisfy a high-order allocation. If this
decision is made before any pages are reclaimed, it is possible that 0 is
returned to the page allocator potentially triggering an OOM. This has
not been observed but it is a possibility so this patch addresses it.
Signed-off-by: Mel Gorman <mgorman@xxxxxxx>
Reviewed-by: Rik van Riel <riel@xxxxxxxxxx>
Cc: Andrea Arcangeli <aarcange@xxxxxxxxxx>
Cc: Minchan Kim <minchan.kim@xxxxxxxxx>
Cc: Dave Jones <davej@xxxxxxxxxx>
Cc: Jan Kara <jack@xxxxxxx>
Cc: Andy Isaacson <adi@xxxxxxxxxxxxx>
Cc: Nai Xia <nai.xia@xxxxxxxxx>
Cc: Johannes Weiner <jweiner@xxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
mm/vmscan.c | 8 +++++++-
1 file changed, 7 insertions(+), 1 deletion(-)
diff -puN mm/vmscan.c~mm-vmscan-do-not-oom-if-aborting-reclaim-to-start-compaction mm/vmscan.c
--- a/mm/vmscan.c~mm-vmscan-do-not-oom-if-aborting-reclaim-to-start-compaction
+++ a/mm/vmscan.c
@@ -2210,6 +2210,7 @@ static unsigned long do_try_to_free_page
struct zoneref *z;
struct zone *zone;
unsigned long writeback_threshold;
+ bool should_abort_reclaim;
get_mems_allowed();
delayacct_freepages_start();
@@ -2221,7 +2222,8 @@ static unsigned long do_try_to_free_page
sc->nr_scanned = 0;
if (!priority)
disable_swap_token(sc->mem_cgroup);
- if (shrink_zones(priority, zonelist, sc))
+ should_abort_reclaim = shrink_zones(priority, zonelist, sc);
+ if (should_abort_reclaim)
break;
/*
@@ -2289,6 +2291,10 @@ out:
if (oom_killer_disabled)
return 0;
+ /* Aborting reclaim to try compaction? don't OOM, then */
+ if (should_abort_reclaim)
+ return 1;
+
/* top priority shrink_zones still had more to do? don't OOM, then */
if (scanning_global_lru(sc) && !all_unreclaimable(zonelist, sc))
return 1;
_
Subject: Subject: mm: vmscan: do not OOM if aborting reclaim to start compaction
Patches currently in -mm which might be from mgorman@xxxxxxx are
linux-next.patch
mm-page-writebackc-make-determine_dirtyable_memory-static-again.patch
mm-reduce-the-amount-of-work-done-when-updating-min_free_kbytes.patch
mm-reduce-the-amount-of-work-done-when-updating-min_free_kbytes-checkpatch-fixes.patch
mm-avoid-livelock-on-__gfp_fs-allocations-v2.patch
mm-more-intensive-memory-corruption-debug.patch
mm-more-intensive-memory-corruption-debug-fix.patch
pm-hibernate-do-not-count-debug-pages-as-savable.patch
slub-min-order-when-debug_guardpage_minorder-0.patch
mm-debug-test-for-online-nid-when-allocating-on-single-node.patch
mm-exclude-reserved-pages-from-dirtyable-memory.patch
mm-exclude-reserved-pages-from-dirtyable-memory-fix.patch
mm-try-to-distribute-dirty-pages-fairly-across-zones.patch
mm-filemap-pass-__gfp_write-from-grab_cache_page_write_begin.patch
btrfs-pass-__gfp_write-for-buffered-write-page-allocations.patch
mm-compaction-push-isolate-search-base-of-compact-control-one-pfn-ahead.patch
mm-fix-off-by-two-in-__zone_watermark_ok.patch
mremap-enforce-rmap-src-dst-vma-ordering-in-case-of-vma_merge-succeeding-in-copy_vma.patch
mremap-enforce-rmap-src-dst-vma-ordering-in-case-of-vma_merge-succeeding-in-copy_vma-update.patch
mm-do-not-stall-in-synchronous-compaction-for-thp-allocations.patch
revert-mm-do-not-stall-in-synchronous-compaction-for-thp-allocations.patch
mm-compaction-allow-compaction-to-isolate-dirty-pages.patch
mm-compaction-use-synchronous-compaction-for-proc-sys-vm-compact_memory.patch
mm-vmscan-check-if-we-isolated-a-compound-page-during-lumpy-scan.patch
mm-vmscan-do-not-oom-if-aborting-reclaim-to-start-compaction.patch
mm-compaction-determine-if-dirty-pages-can-be-migrated-without-blocking-within-migratepage.patch
mm-compaction-make-isolate_lru_page-filter-aware-again.patch
mm-page-allocator-do-not-call-direct-reclaim-for-thp-allocations-while-compaction-is-deferred.patch
mm-compaction-introduce-sync-light-migration-for-use-by-compaction.patch
mm-vmscan-when-reclaiming-for-compaction-ensure-there-are-sufficient-free-pages-available.patch
mm-vmscan-check-if-reclaim-should-really-abort-even-if-compaction_ready-is-true-for-one-zone.patch
mm-isolate-pages-for-immediate-reclaim-on-their-own-lru.patch
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