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authorPaul Szabo <psz@maths.usyd.edu.au>2013-02-22 16:34:42 -0800
committerLinus Torvalds <torvalds@linux-foundation.org>2013-02-23 17:50:17 -0800
commit75f7ad8e043d9383337d917584297f7737154bbf (patch)
tree101f5f2373b615bf83838cd13615fd123dfd765c /mm/page-writeback.c
parent08b52706d505658eac0962d215ff697f898bbc13 (diff)
page-writeback.c: subtract min_free_kbytes from dirtyable memory
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 [akpm@linux-foundation.org: fix up min_free_kbytes extern declarations] [akpm@linux-foundation.org: fix min() warning] Signed-off-by: Paul Szabo <psz@maths.usyd.edu.au> Acked-by: Rik van Riel <riel@redhat.com> Cc: Wu Fengguang <fengguang.wu@intel.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'mm/page-writeback.c')
-rw-r--r--mm/page-writeback.c3
1 files changed, 3 insertions, 0 deletions
diff --git a/mm/page-writeback.c b/mm/page-writeback.c
index 7300c9d5e1d..cdc377c456c 100644
--- a/mm/page-writeback.c
+++ b/mm/page-writeback.c
@@ -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 */
}