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authorRik van Riel <riel@redhat.com>2005-11-28 13:44:07 -0800
committerLinus Torvalds <torvalds@g5.osdl.org>2005-11-28 14:42:25 -0800
commitf7b7fd8f3ebbb2810d6893295aa984acd0fd30db (patch)
tree01afc1edafc50a3c65ec8576c05c60da53d8d242 /include/linux
parenta93a117eaa0bec426d4671a49bfa96a6fdcd2ac9 (diff)
[PATCH] temporarily disable swap token on memory pressure
Some users (hi Zwane) have seen a problem when running a workload that eats nearly all of physical memory - th system does an OOM kill, even when there is still a lot of swap free. The problem appears to be a very big task that is holding the swap token, and the VM has a very hard time finding any other page in the system that is swappable. Instead of ignoring the swap token when sc->priority reaches 0, we could simply take the swap token away from the memory hog and make sure we don't give it back to the memory hog for a few seconds. This patch resolves the problem Zwane ran into. Signed-off-by: Rik van Riel <riel@redhat.com> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
Diffstat (limited to 'include/linux')
-rw-r--r--include/linux/rmap.h4
-rw-r--r--include/linux/swap.h6
2 files changed, 8 insertions, 2 deletions
diff --git a/include/linux/rmap.h b/include/linux/rmap.h
index 35b30e6c8cf..33261f1d223 100644
--- a/include/linux/rmap.h
+++ b/include/linux/rmap.h
@@ -89,7 +89,7 @@ static inline void page_dup_rmap(struct page *page)
/*
* Called from mm/vmscan.c to handle paging out
*/
-int page_referenced(struct page *, int is_locked, int ignore_token);
+int page_referenced(struct page *, int is_locked);
int try_to_unmap(struct page *);
/*
@@ -109,7 +109,7 @@ unsigned long page_address_in_vma(struct page *, struct vm_area_struct *);
#define anon_vma_prepare(vma) (0)
#define anon_vma_link(vma) do {} while (0)
-#define page_referenced(page,l,i) TestClearPageReferenced(page)
+#define page_referenced(page,l) TestClearPageReferenced(page)
#define try_to_unmap(page) SWAP_FAIL
#endif /* CONFIG_MMU */
diff --git a/include/linux/swap.h b/include/linux/swap.h
index 20c975642ca..508668f840b 100644
--- a/include/linux/swap.h
+++ b/include/linux/swap.h
@@ -239,6 +239,11 @@ static inline void put_swap_token(struct mm_struct *mm)
__put_swap_token(mm);
}
+static inline void disable_swap_token(void)
+{
+ put_swap_token(swap_token_mm);
+}
+
#else /* CONFIG_SWAP */
#define total_swap_pages 0
@@ -283,6 +288,7 @@ static inline swp_entry_t get_swap_page(void)
#define put_swap_token(x) do { } while(0)
#define grab_swap_token() do { } while(0)
#define has_swap_token(x) 0
+#define disable_swap_token() do { } while(0)
#endif /* CONFIG_SWAP */
#endif /* __KERNEL__*/