Re: [RFC][PATCH] Remove cgroup member from struct page

From: Nick Piggin
Date: Mon Sep 08 2008 - 23:59:01 EST

On Tuesday 09 September 2008 13:57, KAMEZAWA Hiroyuki wrote:
> On Mon, 8 Sep 2008 20:58:10 +0530
> Balbir Singh <balbir@xxxxxxxxxxxxxxxxxx> wrote:
> > Sorry for the delay in sending out the new patch, I am traveling and
> > thus a little less responsive. Here is the update patch
> Hmm.. I've considered this approach for a while and my answer is that
> this is not what you really want.
> Because you just moves the placement of pointer from memmap to
> radix_tree both in GFP_KERNEL, total kernel memory usage is not changed.
> So, at least, you have to add some address calculation (as I did in March)
> to getting address of page_cgroup. But page_cgroup itself consumes 32bytes
> per page. Then.....

Just keep in mind that an important point is to make it more attractive
to configure cgroup into the kernel, but have it disabled or unused at
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