On Wed, May 13, 2009 at 12:07:30PM +0900, KOSAKI Motohiro wrote:

Subject: [PATCH] vmscan: zone_reclaim use may_swap

Documentation/sysctl/vm.txt says

	zone_reclaim_mode:

	Zone_reclaim_mode allows someone to set more or less aggressive approaches to
	reclaim memory when a zone runs out of memory. If it is set to zero then no
	zone reclaim occurs. Allocations will be satisfied from other zones / nodes
	in the system.

	This is value ORed together of

	1	= Zone reclaim on
	2	= Zone reclaim writes dirty pages out
	4	= Zone reclaim swaps pages


So, "(zone_reclaim_mode & RECLAIM_SWAP) == 0" mean we don't want to reclaim
swap-backed pages. not mapped file.

Thus, may_swap is better than may_unmap.


Signed-off-by: KOSAKI Motohiro <redacted>
Cc: Christoph Lameter <redacted>
Cc: Rik van Riel <redacted>

Reviewed-by: Johannes Weiner <hannes@cmpxchg.org>

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