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

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This reverts commit 75f7ad8e04.  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 ab8fabd46f: "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 <[email protected]>
Cc: Paul Szabo <[email protected]>
Cc: Rik van Riel <[email protected]>
Acked-by: Minchan Kim <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>
This commit is contained in:
Johannes Weiner 2013-09-11 14:20:49 -07:00 • committed by Linus Torvalds
commit 72457c0a05
1 changed files with 0 additions and 3 deletions
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mm/page-writeback.c
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@ -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 */
}