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

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Date:	Thu, 21 Feb 2008 20:01:20 +0900
From:	"KOSAKI Motohiro" <kosaki.motohiro@...fujitsu.com>
To:	balbir@...ux.vnet.ibm.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

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?
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