linux-kernel - Re: [ckrm-tech] [patch02/05]: Containers(V2)- Generic Linux kernel changes

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Date:	Thu, 21 Sep 2006 15:29:45 -0700
From:	Rohit Seth <rohitseth@...gle.com>
To:	sekharan@...ibm.com
Cc:	Christoph Lameter <clameter@....com>, Andi Kleen <ak@...e.de>,
	linux-kernel <linux-kernel@...r.kernel.org>, devel@...nvz.org,
	CKRM-Tech <ckrm-tech@...ts.sourceforge.net>
Subject: Re: [ckrm-tech] [patch02/05]: Containers(V2)- Generic Linux kernel
	changes

On Wed, 2006-09-20 at 18:33 -0700, Chandra Seetharaman wrote:
> On Wed, 2006-09-20 at 17:23 -0700, Christoph Lameter wrote:
> > On Wed, 20 Sep 2006, Andi Kleen wrote:
> > 
> > > There are lots of different cases. At least for anonymous memory 
> > > ->mapping should be free. Perhaps that could be used for anonymous
> > > memory and a separate data structure for the important others.
> > 
> > mapping is used for swap and to point to the anon vma.
> > 
> > > slab should have at least one field free too, although it might be a different
> > > one (iirc Christoph's rewrite uses more than the current slab, but it would
> > > surprise me if he needed all) 
> > 
> > slab currently has lots of fields free but my rewrite uses all of them.
> > And AFAICT this patchset does not track slab pages.
> > 
> > Hmm.... Build a radix tree with pointers to the pages?
> 
> Yes, that would be a way to isolate the overhead.
> 

As said earlier, the additional cost is not really that much.  And if we
do get additional benefit of proper cache alignment for page struct
because of this additional pointer then it could be a almost zero cost.

And in mm kernel, I also see PAGE_OWNER defined which puts the whole
page struct out of sync with caches.

Christoph, Please let me know if there is still a placeholder for
container pointer ONLY for kernel pages.  I think it is easy to do away
with per page pointer for user land as it can be stored in anon_vma or
mappings.

-rohit

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