During freeze_page(), we remove the page from rmap. It munlocks the page if it was mlocked. clear_page_mlock() uses of lru cache, which temporary pins page. Let's drain the lru cache before checking page's count vs. mapcount. The change makes mlocked page split on first attempt, if it was not pinned by somebody else. Signed-off-by: Kirill A. Shutemov <kirill.shutemov@xxxxxxxxxxxxxxx> --- mm/huge_memory.c | 3 +++ 1 file changed, 3 insertions(+) diff --git a/mm/huge_memory.c b/mm/huge_memory.c index 1a988d9b86ef..4c1c292b7ddd 100644 --- a/mm/huge_memory.c +++ b/mm/huge_memory.c @@ -3417,6 +3417,9 @@ int split_huge_page_to_list(struct page *page, struct list_head *list) freeze_page(anon_vma, head); VM_BUG_ON_PAGE(compound_mapcount(head), head); + /* Make sure the page is not on per-CPU pagevec as it takes pin */ + lru_add_drain(); + /* Prevent deferred_split_scan() touching ->_count */ spin_lock(&split_queue_lock); count = page_count(head); -- 2.6.4 -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@xxxxxxxxx. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: <a href=mailto:"dont@xxxxxxxxx";> email@xxxxxxxxx </a>