Messages in this thread Patch in this message | | | Date | Mon, 21 Jan 2013 14:15:49 +1100 | From | paul.szabo@sydney ... | Subject | [PATCH] 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.
Using an "extern int" because that is the only interface to some such sysctl values.
(This patch does not solve the PAE OOM issue.)
Paul Szabo psz@maths.usyd.edu.au http://www.maths.usyd.edu.au/u/psz/ School of Mathematics and Statistics University of Sydney Australia
Reported-by: Paul Szabo <psz@maths.usyd.edu.au> Reference: http://bugs.debian.org/695182 Signed-off-by: Paul Szabo <psz@maths.usyd.edu.au>
--- mm/page-writeback.c.old 2012-12-06 22:20:40.000000000 +1100 +++ mm/page-writeback.c 2013-01-21 13:57:05.000000000 +1100 @@ -343,12 +343,16 @@ unsigned long determine_dirtyable_memory(void) { unsigned long x; + extern int min_free_kbytes; x = global_page_state(NR_FREE_PAGES) + global_reclaimable_pages(); if (!vm_highmem_is_dirtyable) x -= highmem_dirtyable_memory(x); + /* Subtract min_free_kbytes */ + x -= min(x, min_free_kbytes >> (PAGE_SHIFT - 10)); + return x + 1; /* Ensure that we never return 0 */ }
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