From 1a8018fb4c6976559c3f04bcf760822381be501d Mon Sep 17 00:00:00 2001 From: Minchan Kim Date: Tue, 2 Aug 2016 14:02:25 -0700 Subject: [PATCH] mm: move swap-in anonymous page into active list Every swap-in anonymous page starts from inactive lru list's head. It should be activated unconditionally when VM decide to reclaim because page table entry for the page always usually has marked accessed bit. Thus, their window size for getting a new referece is 2 * NR_inactive + NR_active while others is NR_inactive + NR_active. It's not fair that it has more chance to be referenced compared to other newly allocated page which starts from active lru list's head. Johannes: : The page can still have a valid copy on the swap device, so prefering to : reclaim that page over a fresh one could make sense. But as you point : out, having it start inactive instead of active actually ends up giving it : *more* LRU time, and that seems to be without justification. Rik: : The reason newly read in swap cache pages start on the inactive list is : that we do some amount of read-around, and do not know which pages will : get used. : : However, immediately activating the ones that DO get used, like your patch : does, is the right thing to do. Link: http://lkml.kernel.org/r/1469762740-17860-1-git-send-email-minchan@kernel.org Signed-off-by: Minchan Kim Acked-by: Johannes Weiner Acked-by: Rik van Riel Cc: Nadav Amit Cc: Mel Gorman Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- mm/memory.c | 1 + 1 file changed, 1 insertion(+) diff --git a/mm/memory.c b/mm/memory.c index 04004834e985..83be99d9d8a1 100644 --- a/mm/memory.c +++ b/mm/memory.c @@ -2642,6 +2642,7 @@ int do_swap_page(struct fault_env *fe, pte_t orig_pte) if (page == swapcache) { do_page_add_anon_rmap(page, vma, fe->address, exclusive); mem_cgroup_commit_charge(page, memcg, true, false); + activate_page(page); } else { /* ksm created a completely new copy */ page_add_new_anon_rmap(page, vma, fe->address, false); mem_cgroup_commit_charge(page, memcg, false, false);