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SubjectRe: [RFC] Restrict size of page_cgroup->flags
* nishimura@mxp.nes.nec.co.jp <nishimura@mxp.nes.nec.co.jp> [2010-10-07 09:54:58]:

> On Wed, 6 Oct 2010 19:53:14 +0530
> Balbir Singh <balbir@linux.vnet.ibm.com> wrote:
>
> > I propose restricting page_cgroup.flags to 16 bits. The patch for the
> > same is below. Comments?
> >
> >
> > Restrict the bits usage in page_cgroup.flags
> >
> > From: Balbir Singh <balbir@linux.vnet.ibm.com>
> >
> > Restricting the flags helps control growth of the flags unbound.
> > Restriciting it to 16 bits gives us the possibility of merging
> > cgroup id with flags (atomicity permitting) and saving a whole
> > long word in page_cgroup
> >
> I agree that reducing the size of page_cgroup would be good and important.
> But, wouldn't it be better to remove ->page, if possible ?
>

Without the page pointer, how do we go from pc to page for reclaim?

--
Three Cheers,
Balbir


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