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page-writeback.c: subtract min_free_kbytes from dirtyable memory

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When calculating amount of dirtyable memory, min_free_kbytes should be
subtracted because it is not intended for dirty pages.

Addresses http://bugs.debian.org/695182

[[email protected]: fix up min_free_kbytes extern declarations]
[[email protected]: fix min() warning]
Signed-off-by: Paul Szabo <[email protected]>
Acked-by: Rik van Riel <[email protected]>
Cc: Wu Fengguang <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>
This commit is contained in:
Paul Szabo 2013-02-22 16:34:42 -08:00 • committed by Linus Torvalds
commit 75f7ad8e04
4 changed files with 6 additions and 2 deletions
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3
mm/page-writeback.c
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@ -241,6 +241,9 @@ static unsigned long global_dirtyable_memory(void)
if (!vm_highmem_is_dirtyable)
x -= highmem_dirtyable_memory(x);
/* Subtract min_free_kbytes */
x -= min_t(unsigned long, x, min_free_kbytes >> (PAGE_SHIFT - 10));
return x + 1; /* Ensure that we never return 0 */
}