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[PATCH] temporarily disable swap token on memory pressure

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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>
This commit is contained in:
Rik van Riel
2005-11-28 13:44:07 -08:00
committed by Linus Torvalds
parent a93a117eaa
commit f7b7fd8f3e
5 changed files with 34 additions and 23 deletions
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6
include/linux/swap.h
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@@ -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__*/