From: Hugh Dickins <hughd@xxxxxxxxxx> Subject: mm: migration of hugetlbfs page skip memcg 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". Link: http://lkml.kernel.org/r/alpine.LSU.2.11.2008301359460.5954@eggly.anvils Signed-off-by: Hugh Dickins <hughd@xxxxxxxxxx> Reviewed-by: Shakeel Butt <shakeelb@xxxxxxxxxx> Acked-by: Johannes Weiner <hannes@xxxxxxxxxx> Cc: Alex Shi <alex.shi@xxxxxxxxxxxxxxxxx> Cc: Michal Hocko <mhocko@xxxxxxxx> Cc: Mike Kravetz <mike.kravetz@xxxxxxxxxx> Cc: Qian Cai <cai@xxxxxx> Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx> --- mm/migrate.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) --- a/mm/migrate.c~mm-migration-of-hugetlbfs-page-skip-memcg +++ a/mm/migrate.c @@ -668,7 +668,8 @@ void migrate_page_states(struct page *ne copy_page_owner(page, newpage); - mem_cgroup_migrate(page, newpage); + if (!PageHuge(page)) + mem_cgroup_migrate(page, newpage); } EXPORT_SYMBOL(migrate_page_states); _
