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authorHugh Dickins <hugh@veritas.com>2008-11-19 15:36:37 -0800
committerLinus Torvalds <torvalds@linux-foundation.org>2008-11-19 18:49:59 -0800
commit63eb6b93ce725e4c5f38fc85dd703d49465b03cb (patch)
tree5370a3080b8f20ae27904a3c36646f79b26c6665 /mm
parentbda8550deed96687f29992d711a88ea21cff4d26 (diff)
downloadlinux-2.6.34-ux500-63eb6b93ce725e4c5f38fc85dd703d49465b03cb.tar.gz
vmscan: let GFP_NOFS go to swap again
In the past, GFP_NOFS (but of course not GFP_NOIO) was allowed to reclaim by writing to swap. That got partially broken in 2.6.23, when may_enter_fs initialization was moved up before the allocation of swap, so its PageSwapCache test was failing the first time around, Fix it by setting may_enter_fs when add_to_swap() succeeds with __GFP_IO. In fact, check __GFP_IO before calling add_to_swap(): allocating swap we're not ready to use just increases disk seeking. Signed-off-by: Hugh Dickins <hugh@veritas.com> Cc: Rik van Riel <riel@redhat.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.c3
1 files changed, 3 insertions, 0 deletions
diff --git a/mm/vmscan.c b/mm/vmscan.c
index c141b3e7807..f83a7ed5c6c 100644
--- a/mm/vmscan.c
+++ b/mm/vmscan.c
@@ -623,6 +623,8 @@ static unsigned long shrink_page_list(struct list_head *page_list,
* Try to allocate it some swap space here.
*/
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:
@@ -634,6 +636,7 @@ static unsigned long shrink_page_list(struct list_head *page_list,
}
if (!add_to_swap(page, GFP_ATOMIC))
goto activate_locked;
+ may_enter_fs = 1;
}
#endif /* CONFIG_SWAP */