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| author | Rei Yamamoto <yamamoto.rei@jp.fujitsu.com> | 2022-05-14 01:48:57 +0200 |
|---|---|---|
| committer | Andrew Morton <akpm@linux-foundation.org> | 2022-05-14 01:48:57 +0200 |
| commit | bbe832b9db2e1ad21522f8f0bf02775fff8a0e0e (patch) | |
| tree | c119e9205c64f6a6f6c188f98e58ee78138a3da2 /mm/compaction.c | |
| parent | mm/damon: add documentation for Enum value (diff) | |
| download | linux-bbe832b9db2e1ad21522f8f0bf02775fff8a0e0e.tar.xz linux-bbe832b9db2e1ad21522f8f0bf02775fff8a0e0e.zip | |
mm, compaction: fast_find_migrateblock() should return pfn in the target zone
At present, pages not in the target zone are added to cc->migratepages
list in isolate_migratepages_block(). As a result, pages may migrate
between nodes unintentionally.
This would be a serious problem for older kernels without commit
a984226f457f849e ("mm: memcontrol: remove the pgdata parameter of
mem_cgroup_page_lruvec"), because it can corrupt the lru list by
handling pages in list without holding proper lru_lock.
Avoid returning a pfn outside the target zone in the case that it is
not aligned with a pageblock boundary. Otherwise
isolate_migratepages_block() will handle pages not in the target zone.
Link: https://lkml.kernel.org/r/20220511044300.4069-1-yamamoto.rei@jp.fujitsu.com
Fixes: 70b44595eafe ("mm, compaction: use free lists to quickly locate a migration source")
Signed-off-by: Rei Yamamoto <yamamoto.rei@jp.fujitsu.com>
Reviewed-by: Miaohe Lin <linmiaohe@huawei.com>
Acked-by: Mel Gorman <mgorman@techsingularity.net>
Reviewed-by: Oscar Salvador <osalvador@suse.de>
Cc: Don Dutile <ddutile@redhat.com>
Cc: Wonhyuk Yang <vvghjk1234@gmail.com>
Cc: Rei Yamamoto <yamamoto.rei@jp.fujitsu.com>
Cc: <stable@vger.kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Diffstat (limited to 'mm/compaction.c')
| -rw-r--r-- | mm/compaction.c | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/mm/compaction.c b/mm/compaction.c index 0e0ef9e44530..1f89b969c12b 100644 --- a/mm/compaction.c +++ b/mm/compaction.c @@ -1848,6 +1848,8 @@ static unsigned long fast_find_migrateblock(struct compact_control *cc) update_fast_start_pfn(cc, free_pfn); pfn = pageblock_start_pfn(free_pfn); + if (pfn < cc->zone->zone_start_pfn) + pfn = cc->zone->zone_start_pfn; cc->fast_search_fail = 0; found_block = true; set_pageblock_skip(freepage); |