The patch titled
Subject: mm, compaction: use free lists to quickly locate a migration target -fix
has been added to the -mm tree. Its filename is
mm-compaction-use-free-lists-to-quickly-locate-a-migration-target-fix.patch
This patch should soon appear at
http://ozlabs.org/~akpm/mmots/broken-out/mm-compaction-use-free-lists-to-quickly-locate-a-migration-target-fix.patch
and later at
http://ozlabs.org/~akpm/mmotm/broken-out/mm-compaction-use-free-lists-to-quickly-locate-a-migration-target-fix.patch
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------------------------------------------------------
From: Mel Gorman <mgorman@xxxxxxxxxxxxxxxxxxx>
Subject: mm, compaction: use free lists to quickly locate a migration target -fix
Full compaction of a node passes in negative orders which can lead to
array boundary issues. While it could be addressed in the control flow of
the primary loop, it would be fragile so explicitly check for the
condition. This is a fix for the mmotm patch
broken-out/mm-compaction-use-free-lists-to-quickly-locate-a-migration-target.patch
Link: http://lkml.kernel.org/r/20190109212603.GY31517@xxxxxxxxxxxxxxxxxxx
Signed-off-by: Mel Gorman <mgorman@xxxxxxxxxxxxxxxxxxx>
Cc: Andrea Arcangeli <aarcange@xxxxxxxxxx>
Cc: David Rientjes <rientjes@xxxxxxxxxx>
Cc: Huang Ying <ying.huang@xxxxxxxxx>
Cc: Kirill A. Shutemov <kirill@xxxxxxxxxxxxx>
Cc: Vlastimil Babka <vbabka@xxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
mm/compaction.c | 4 ++++
1 file changed, 4 insertions(+)
--- a/mm/compaction.c~mm-compaction-use-free-lists-to-quickly-locate-a-migration-target-fix
+++ a/mm/compaction.c
@@ -1206,6 +1206,10 @@ fast_isolate_freepages(struct compact_co
bool scan_start = false;
int order;
+ /* Full compaction passes in a negative order */
+ if (cc->order <= 0)
+ return cc->free_pfn;
+
/*
* If starting the scan, use a deeper search and use the highest
* PFN found if a suitable one is not found.
_
Patches currently in -mm which might be from mgorman@xxxxxxxxxxxxxxxxxxx are
mm-compaction-shrink-compact_control.patch
mm-compaction-rearrange-compact_control.patch
mm-compaction-remove-last_migrated_pfn-from-compact_control.patch
mm-compaction-remove-unnecessary-zone-parameter-in-some-instances.patch
mm-compaction-rename-map_pages-to-split_map_pages.patch
mm-compaction-skip-pageblocks-with-reserved-pages.patch
mm-migrate-immediately-fail-migration-of-a-page-with-no-migration-handler.patch
mm-compaction-always-finish-scanning-of-a-full-pageblock.patch
mm-compaction-use-the-page-allocator-bulk-free-helper-for-lists-of-pages.patch
mm-compaction-ignore-the-fragmentation-avoidance-boost-for-isolation-and-compaction.patch
mm-compaction-use-free-lists-to-quickly-locate-a-migration-source.patch
mm-compaction-keep-migration-source-private-to-a-single-compaction-instance.patch
mm-compaction-use-free-lists-to-quickly-locate-a-migration-target.patch
mm-compaction-use-free-lists-to-quickly-locate-a-migration-target-fix.patch
mm-compaction-avoid-rescanning-the-same-pageblock-multiple-times.patch
mm-compaction-finish-pageblock-scanning-on-contention.patch
mm-compaction-check-early-for-huge-pages-encountered-by-the-migration-scanner.patch
mm-compaction-keep-cached-migration-pfns-synced-for-unusable-pageblocks.patch
mm-compaction-rework-compact_should_abort-as-compact_check_resched.patch
mm-compaction-do-not-consider-a-need-to-reschedule-as-contention.patch
mm-compaction-reduce-unnecessary-skipping-of-migration-target-scanner.patch
mm-compaction-round-robin-the-order-while-searching-the-free-lists-for-a-target.patch
mm-compaction-round-robin-the-order-while-searching-the-free-lists-for-a-target-fix.patch
mm-compaction-sample-pageblocks-for-free-pages.patch
mm-compaction-be-selective-about-what-pageblocks-to-clear-skip-hints.patch
mm-compaction-capture-a-page-under-direct-compaction.patch
mm-compaction-do-not-direct-compact-remote-memory.patch
