From: Kefeng Wang wangkefeng.wang@huawei.com
[ Upstream commit 728be28fae8c838d52c91dce4867133798146357 ]
The check of THP mapped by multiple processes was introduced by commit 04fa5d6a6547 ("mm: migrate: check page_count of THP before migrating") and refactor by commit 340ef3902cf2 ("mm: numa: cleanup flow of transhuge page migration"), which is out of date, since migrate_misplaced_page() is now using the standard migrate_pages() for small pages and THPs, the reference count checking is in folio_migrate_mapping(), so let's remove the special check for THP.
Link: https://lkml.kernel.org/r/20230913095131.2426871-3-wangkefeng.wang@huawei.co... Signed-off-by: Kefeng Wang wangkefeng.wang@huawei.com Suggested-by: Matthew Wilcox (Oracle) willy@infradead.org Reviewed-by: "Huang, Ying" ying.huang@intel.com Cc: David Hildenbrand david@redhat.com Cc: Hugh Dickins hughd@google.com Cc: Mike Kravetz mike.kravetz@oracle.com Cc: Zi Yan ziy@nvidia.com Signed-off-by: Andrew Morton akpm@linux-foundation.org Stable-dep-of: 2774f256e7c0 ("mm/vmscan: fix a bug calling wakeup_kswapd() with a wrong zone index") Signed-off-by: Sasha Levin sashal@kernel.org --- mm/migrate.c | 4 ---- 1 file changed, 4 deletions(-)
diff --git a/mm/migrate.c b/mm/migrate.c index 6f8ad6b64c9bc..c9fabb960996f 100644 --- a/mm/migrate.c +++ b/mm/migrate.c @@ -2506,10 +2506,6 @@ static int numamigrate_isolate_page(pg_data_t *pgdat, struct page *page) int nr_pages = thp_nr_pages(page); int order = compound_order(page);
- /* Do not migrate THP mapped by multiple processes */ - if (PageTransHuge(page) && total_mapcount(page) > 1) - return 0; - /* Avoid migrating to a node that is nearly full */ if (!migrate_balanced_pgdat(pgdat, nr_pages)) { int z;