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mm: migration of hugetlbfs page skip memcg

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hugetlbfs pages do not participate in memcg: so although they do find most
of migrate_page_states() useful, it would be better if they did not call
into mem_cgroup_migrate() - where Qian Cai reported that LTP's
move_pages12 triggers the warning in Alex Shi's prospective commit
"mm/memcg: warning on !memcg after readahead page charged".

Signed-off-by: Hugh Dickins <hughd@google.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Reviewed-by: Shakeel Butt <shakeelb@google.com>
Acked-by: Johannes Weiner <hannes@cmpxch.org>
Cc: Alex Shi <alex.shi@linux.alibaba.com>
Cc: Michal Hocko <mhocko@suse.com>
Cc: Mike Kravetz <mike.kravetz@oracle.com>
Cc: Qian Cai <cai@lca.pw>
Link: http://lkml.kernel.org/r/alpine.LSU.2.11.2008301359460.5954@eggly.anvils
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Hugh Dickins 2020-09-18 21:20:06 -07:00 committed by Linus Torvalds
parent 62fdb1632b
commit a333e3e73b
1 changed files with 2 additions and 1 deletions
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mm/migrate.c
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@ -668,7 +668,8 @@ void migrate_page_states(struct page *newpage, struct page *page)
copy_page_owner(page, newpage);
mem_cgroup_migrate(page, newpage);
if (!PageHuge(page))
mem_cgroup_migrate(page, newpage);
}
EXPORT_SYMBOL(migrate_page_states);