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mm: revert "page-writeback.c: subtract min_free_kbytes from dirtyable memory"
This reverts commit75f7ad8e04
. It was the result of a problem observed with a 3.2 kernel and merged in 3.9, while the issue had been resolved upstream in 3.3 (commitab8fabd46f
: "mm: exclude reserved pages from dirtyable memory"). The "reserved pages" are a superset of min_free_kbytes, thus this change is redundant and confusing. Revert it. Signed-off-by: Johannes Weiner <hannes@cmpxchg.org> Cc: Paul Szabo <psz@maths.usyd.edu.au> Cc: Rik van Riel <riel@redhat.com> Acked-by: Minchan Kim <minchan@kernel.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
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@ -241,9 +241,6 @@ static unsigned long global_dirtyable_memory(void)
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if (!vm_highmem_is_dirtyable)
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x -= highmem_dirtyable_memory(x);
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/* Subtract min_free_kbytes */
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x -= min_t(unsigned long, x, min_free_kbytes >> (PAGE_SHIFT - 10));
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return x + 1; /* Ensure that we never return 0 */
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}
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