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| author | Lee Schermerhorn <lee.schermerhorn@hp.com> | 2005-10-29 18:15:51 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@g5.osdl.org> | 2005-10-29 21:40:36 -0700 |
| commit | c340010e4bf824d969a89fa192ecc7a526c0cd24 (patch) | |
| tree | a459fba71b05b3b14dc1e32739cc2520dd0e57be /mm/vmscan.c | |
| parent | b57b98d147ef98758886a39efb94f3254542c39b (diff) | |
| download | lwn-c340010e4bf824d969a89fa192ecc7a526c0cd24.tar.gz lwn-c340010e4bf824d969a89fa192ecc7a526c0cd24.zip | |
[PATCH] shrink_list(): skip anon pages if not may_swap
Martin Hicks' page cache reclaim patch added the 'may_swap' flag to the
scan_control struct; and modified shrink_list() not to add anon pages to
the swap cache if may_swap is not asserted.
Ref: http://marc.theaimsgroup.com/?l=linux-mm&m=111461480725322&w=4
However, further down, if the page is mapped, shrink_list() calls
try_to_unmap() which will call try_to_unmap_one() via try_to_unmap_anon ().
try_to_unmap_one() will BUG_ON() an anon page that is NOT in the swap
cache. Martin says he never encountered this path in his testing, but
agrees that it might happen.
This patch modifies shrink_list() to skip anon pages that are not already
in the swap cache when !may_swap, rather than just not adding them to the
cache.
Signed-off-by: Lee Schermerhorn <lee.schermerhorn@hp.com>
Cc: Hugh Dickins <hugh@veritas.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
Diffstat (limited to 'mm/vmscan.c')
| -rw-r--r-- | mm/vmscan.c | 4 |
1 files changed, 3 insertions, 1 deletions
diff --git a/mm/vmscan.c b/mm/vmscan.c index 843c87d1e61f..41d1064aabfb 100644 --- a/mm/vmscan.c +++ b/mm/vmscan.c @@ -417,7 +417,9 @@ static int shrink_list(struct list_head *page_list, struct scan_control *sc) * Anonymous process memory has backing store? * Try to allocate it some swap space here. */ - if (PageAnon(page) && !PageSwapCache(page) && sc->may_swap) { + if (PageAnon(page) && !PageSwapCache(page)) { + if (!sc->may_swap) + goto keep_locked; if (!add_to_swap(page)) goto activate_locked; } |