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Commit 72457c0a authored by Johannes Weiner's avatar Johannes Weiner Committed by Linus Torvalds
Browse files

mm: revert "page-writeback.c: subtract min_free_kbytes from dirtyable memory" 



This reverts commit 75f7ad8e.  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 (commit ab8fabd4: "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: default avatarJohannes Weiner <hannes@cmpxchg.org>
Cc: Paul Szabo <psz@maths.usyd.edu.au>
Cc: Rik van Riel <riel@redhat.com>
Acked-by: default avatarMinchan Kim <minchan@kernel.org>
Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
parent 81c0a2bb

mm/page-writeback.c

+0 −3
Original line number Diff line number Diff line
@@ -241,9 +241,6 @@ 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 */

}