Messages in this thread | | | Date | Sun, 24 May 2009 22:44:30 +0900 (JST) | From | KOSAKI Motohiro <> | Subject | Re: [PATCH 4/4] zone_reclaim_mode is always 0 by default |
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sorry I missed this mail
> > > Even with 128 nodes and 256 cpus, I _NEVER_ see the > > > system swapping out before allocating off node so I can certainly not > > > reproduce the situation you are seeing. > > > > hmhm. but I don't think we can assume hpc workload. > > System swapping due to zone reclaim? zone reclaim only reclaims unmapped > pages so it will not swap. Maybe some bug crept in in the recent changes? > Or you overrode the defaults for zone reclaim?
I guess he use zone_reclaim_mode=7 or similar.
However, I have to explain recent zone reclaim change. current zone reclaim is
1. zone reclaim can make high order reclaim (by hanns) 2. determine file-backed page by get_scan_ratio
it mean, high order allocation makes lumpy zone reclaim. and shrink_inactive_list() don't care may_swap. then, zone_reclaim_mode=1 can makes swap-out if your driver makes high order allocation request.
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