From e709ffd6169ccd259eb5874e853303e91e94e829 Mon Sep 17 00:00:00 2001 From: Rik van Riel Date: Tue, 29 May 2012 15:06:18 -0700 Subject: mm: remove swap token code The swap token code no longer fits in with the current VM model. It does not play well with cgroups or the better NUMA placement code in development, since we have only one swap token globally. It also has the potential to mess with scalability of the system, by increasing the number of non-reclaimable pages on the active and inactive anon LRU lists. Last but not least, the swap token code has been broken for a year without complaints, as reported by Konstantin Khlebnikov. This suggests we no longer have much use for it. The days of sub-1G memory systems with heavy use of swap are over. If we ever need thrashing reducing code in the future, we will have to implement something that does scale. Signed-off-by: Rik van Riel Cc: Konstantin Khlebnikov Acked-by: Johannes Weiner Cc: Mel Gorman Cc: Hugh Dickins Acked-by: Bob Picco Acked-by: KOSAKI Motohiro Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- mm/rmap.c | 6 ------ 1 file changed, 6 deletions(-) (limited to 'mm/rmap.c') diff --git a/mm/rmap.c b/mm/rmap.c index 5b5ad584ffb7..0f3b7cda2a24 100644 --- a/mm/rmap.c +++ b/mm/rmap.c @@ -755,12 +755,6 @@ int page_referenced_one(struct page *page, struct vm_area_struct *vma, pte_unmap_unlock(pte, ptl); } - /* Pretend the page is referenced if the task has the - swap token and is in the middle of a page fault. */ - if (mm != current->mm && has_swap_token(mm) && - rwsem_is_locked(&mm->mmap_sem)) - referenced++; - (*mapcount)--; if (referenced) -- cgit v1.2.3