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authorHugh Dickins <hugh@veritas.com>2009-01-06 14:39:38 -0800
committerLinus Torvalds <torvalds@linux-foundation.org>2009-01-06 15:59:03 -0800
commit63d6c5ad7fc27455ce5cb4706884671fb7e0df08 (patch)
tree82cf04209a4825ab4daf2a94977fc44550d2c9b7 /mm
parent68bdc8d64742ccc5e340c5d122ebbab3f0cf2a74 (diff)
mm: remove try_to_munlock from vmscan
An unfortunate feature of the Unevictable LRU work was that reclaiming an anonymous page involved an extra scan through the anon_vma: to check that the page is evictable before allocating swap, because the swap could not be freed reliably soon afterwards. Now try_to_free_swap() has replaced remove_exclusive_swap_page(), that's not an issue any more: remove try_to_munlock() call from shrink_page_list(), leaving it to try_to_munmap() to discover if the page is one to be culled to the unevictable list - in which case then try_to_free_swap(). Update unevictable-lru.txt to remove comments on the try_to_munlock() in shrink_page_list(), and shorten some lines over 80 columns. Signed-off-by: Hugh Dickins <hugh@veritas.com> Cc: Lee Schermerhorn <lee.schermerhorn@hp.com> Acked-by: Rik van Riel <riel@redhat.com> Cc: Nick Piggin <nickpiggin@yahoo.com.au> Cc: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com> Cc: Robin Holt <holt@sgi.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'mm')
-rw-r--r--mm/vmscan.c11
1 files changed, 2 insertions, 9 deletions
diff --git a/mm/vmscan.c b/mm/vmscan.c
index c8601dd3660..74f875733e2 100644
--- a/mm/vmscan.c
+++ b/mm/vmscan.c
@@ -625,15 +625,6 @@ static unsigned long shrink_page_list(struct list_head *page_list,
if (PageAnon(page) && !PageSwapCache(page)) {
if (!(sc->gfp_mask & __GFP_IO))
goto keep_locked;
- switch (try_to_munlock(page)) {
- case SWAP_FAIL: /* shouldn't happen */
- case SWAP_AGAIN:
- goto keep_locked;
- case SWAP_MLOCK:
- goto cull_mlocked;
- case SWAP_SUCCESS:
- ; /* fall thru'; add to swap cache */
- }
if (!add_to_swap(page, GFP_ATOMIC))
goto activate_locked;
may_enter_fs = 1;
@@ -752,6 +743,8 @@ free_it:
continue;
cull_mlocked:
+ if (PageSwapCache(page))
+ try_to_free_swap(page);
unlock_page(page);
putback_lru_page(page);
continue;