Messages in this thread | | | Date | Wed, 13 May 2009 13:26:40 +0200 | From | Johannes Weiner <> | Subject | Re: [PATCH 3/4] vmscan: zone_reclaim use may_swap |
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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 <kosaki.motohiro@jp.fujitsu.com> > Cc: Christoph Lameter <cl@linux-foundation.org> > Cc: Rik van Riel <riel@redhat.com>
Reviewed-by: Johannes Weiner <hannes@cmpxchg.org>
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