With commit 645747462435, pte referenced file page isn't activated in inactive list scan. For VM_EXEC page, if it can't get a chance to active list, the executable page protect loses its effect. We protect such page in inactive scan here, now such page will be guaranteed cached in a full scan of active and inactive list, which restores previous behavior. Signed-off-by: Shaohua Li <shaohua.li@xxxxxxxxx> diff --git a/mm/vmscan.c b/mm/vmscan.c index c5dfabf..b973048 100644 --- a/mm/vmscan.c +++ b/mm/vmscan.c @@ -608,8 +608,15 @@ static enum page_references page_check_references(struct page *page, * quickly recovered. */ SetPageReferenced(page); - - if (referenced_page) + /* + * Identify pte referenced and file-backed pages and give them + * one trip around the active list. So that executable code get + * better chances to stay in memory under moderate memory + * pressure. JVM can create lots of anon VM_EXEC pages, so we + * ignore them here. + */ + if (referenced_page || ((vm_flags & VM_EXEC) && + page_is_file_cache(page))) return PAGEREF_ACTIVATE; return PAGEREF_KEEP; -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@xxxxxxxxxx For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: <a href=mailto:"dont@xxxxxxxxx";> email@xxxxxxxxx </a>