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authorHugh Dickins <hugh@veritas.com>2009-01-06 17:39:36 -0500
committerLinus Torvalds <torvalds@linux-foundation.org>2009-01-06 18:59:03 -0500
commita2c43eed8334e878702fca713b212ae2a11d84b9 (patch)
tree4eb3f9b9153df5e7a638b15a6f7c9aa924066a94 /mm/memory.c
parent7b1fe59793e61f826bef053107b57b23954833bb (diff)
mm: try_to_free_swap replaces remove_exclusive_swap_page
remove_exclusive_swap_page(): its problem is in living up to its name. It doesn't matter if someone else has a reference to the page (raised page_count); it doesn't matter if the page is mapped into userspace (raised page_mapcount - though that hints it may be worth keeping the swap): all that matters is that there be no more references to the swap (and no writeback in progress). swapoff (try_to_unuse) has been removing pages from swapcache for years, with no concern for page count or page mapcount, and we used to have a comment in lookup_swap_cache() recognizing that: if you go for a page of swapcache, you'll get the right page, but it could have been removed from swapcache by the time you get page lock. So, give up asking for exclusivity: get rid of remove_exclusive_swap_page(), and remove_exclusive_swap_page_ref() and remove_exclusive_swap_page_count() which were spawned for the recent LRU work: replace them by the simpler try_to_free_swap() which just checks page_swapcount(). Similarly, remove the page_count limitation from free_swap_and_count(), but assume that it's worth holding on to the swap if page is mapped and swap nowhere near full. Add a vm_swap_full() test in free_swap_cache()? It would be consistent, but I think we probably have enough for now. Signed-off-by: Hugh Dickins <hugh@veritas.com> Cc: Lee Schermerhorn <lee.schermerhorn@hp.com> Cc: 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/memory.c')
-rw-r--r--mm/memory.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/mm/memory.c b/mm/memory.c
index 8f471edcb985..1a83fe5339a9 100644
--- a/mm/memory.c
+++ b/mm/memory.c
@@ -2403,7 +2403,7 @@ static int do_swap_page(struct mm_struct *mm, struct vm_area_struct *vma,
2403 2403
2404 swap_free(entry); 2404 swap_free(entry);
2405 if (vm_swap_full() || (vma->vm_flags & VM_LOCKED) || PageMlocked(page)) 2405 if (vm_swap_full() || (vma->vm_flags & VM_LOCKED) || PageMlocked(page))
2406 remove_exclusive_swap_page(page); 2406 try_to_free_swap(page);
2407 unlock_page(page); 2407 unlock_page(page);
2408 2408
2409 if (write_access) { 2409 if (write_access) {