linux-kernel - Re: [RFC][PATCH] the proposal of improve page reclaim by throttle

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Date:	Thu, 21 Feb 2008 16:32:09 +0530
From:	Balbir Singh <balbir@...ux.vnet.ibm.com>
To:	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>
CC:	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>,
	Rik van Riel <riel@...hat.com>,
	Lee Schermerhorn <Lee.Schermerhorn@...com>, linux-mm@...ck.org,
	linux-kernel@...r.kernel.org
Subject: Re: [RFC][PATCH] the proposal of improve page reclaim by throttle

KOSAKI Motohiro wrote:
> Hi balbir-san
> 
>>  It's good to keep the main reclaim code and the memory controller reclaim in
>>  sync, so this is a nice effort.
> 
> thank you.
> I will repost next version (fixed nick's opinion) while a few days.
> 
>>  > @@ -1456,7 +1501,7 @@ unsigned long try_to_free_mem_cgroup_pag
>>  >       int target_zone = gfp_zone(GFP_HIGHUSER_MOVABLE);
>>  >
>>  >       zones = NODE_DATA(numa_node_id())->node_zonelists[target_zone].zones;
>>  > -     if (do_try_to_free_pages(zones, sc.gfp_mask, &sc))
>>  > +     if (try_to_free_pages_throttled(zones, 0, sc.gfp_mask, &sc))
>>  >               return 1;
>>  >       return 0;
>>  >  }
>>
>>  try_to_free_pages_throttled checks for zone_watermark_ok(), that will not work
>>  in the case that we are reclaiming from a cgroup which over it's limit. We need
>>  a different check, to see if the mem_cgroup is still over it's limit or not.
> 
> That makes sense.
> 
> unfortunately, I don't know mem-cgroup so much.
> What do i use function, instead?

One option could be that once the memory controller has this feature, we'll need
no changes in try_to_free_mem_cgroup_pages.

-- 
	Warm Regards,
	Balbir Singh
	Linux Technology Center
	IBM, ISTL
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