Re: [RFC][PATCH] radix-tree based page_cgroup. [1/7] definitions for page_cgroup

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

On Tue, 26 Feb 2008 16:46:41 +0900 (JST)
Hirokazu Takahashi <taka@valinux.co.jp> wrote:

>
> > > (3) The page member can be replaced with the page frame number and it will be
> > >     also possible to use some kind of ID instead of the mem_cgroup member.
> > >     This means these members can be encoded to one members with other members
> > >     such as "flags" and "refcnt"
> >  
> > I think there is a case that "pfn" doesn't fit in 32bit.
> > (64bit system tend to have sparse address space.)
> > We need unsigned long anyway.
> 
> It will be a 64bit variable on a 64bit machine, where the pointers are
> also 64bit long. I think you can encode "pfn" and other stuff into one
> 64bit variable.
> 
Next version will have reclaim of page_cgroup, I'm now trying.
The size itself will be discussed later.

Thanks,
-Kame

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