Re: [PATCH 4/4] Memory controller soft limit reclaim on contention (v6)

[KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>]

On Tue, 17 Mar 2009 11:25:06 +0530
Balbir Singh <balbir@linux.vnet.ibm.com> wrote:

> * KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com> [2009-03-17 14:17:14]:
> > > That is not true..we don't track them to default cgroup unless
> > > memory.use_hiearchy is enabled in the root cgroup. 
> > What I want to say is "the task which is not attached to user's cgroup is
> > also under defaut cgroup, so we don't need additional hook"
> > Not talking about hierarchy.
> >
> 
> Since all the user pages are tracked in one or the other cgroup, the
> total accounting is equal to total_lru_pages across all zones/nodes.
> Your suggestion boils down to if total_lru_pages reaches a threshold,
> do soft limit reclaim, instead of doing reclaim when there is
> contention.. right?
>  
Yes.


> > It's not necessary. for example, reading vmstat doesn't need global lock.
> >
> 
> It uses atomic values for accounting. 
> 
Ah, my point is that "when it comes to usage of global LRU,
accounting pages is already done somewhere. we can reuse it."
Not means "add some new counter"

-Kame

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