linux-kernel - Re: [PATCH v2 0/3] staging: zcache: xcfmalloc support

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Date:	Fri, 16 Sep 2011 13:46:41 -0400
From:	Nitin Gupta <ngupta@...are.org>
To:	Seth Jennings <sjenning@...ux.vnet.ibm.com>
CC:	Greg KH <greg@...ah.com>, gregkh@...e.de,
	devel@...verdev.osuosl.org, dan.magenheimer@...cle.com,
	cascardo@...oscopio.com, linux-kernel@...r.kernel.org,
	dave@...ux.vnet.ibm.com, linux-mm@...ck.org,
	brking@...ux.vnet.ibm.com, rcj@...ux.vnet.ibm.com
Subject: Re: [PATCH v2 0/3] staging: zcache: xcfmalloc support

Hi Seth,

On 09/15/2011 12:31 PM, Seth Jennings wrote:

> 
> So this is how I see things...
> 
> Right now xvmalloc is broken for zcache's application because
> of its huge fragmentation for half the valid allocation sizes
> (> PAGE_SIZE/2).
> 
> My xcfmalloc patches are _a_ solution that is ready now.  Sure,
> it doesn't so compaction yet, and it has some metadata overhead.
> So it's not "ideal" (if there is such I thing). But it does fix
> the brokenness of xvmalloc for zcache's application.
> 
> So I see two ways going forward:
> 
> 1) We review and integrate xcfmalloc now.  Then, when you are
> done with your allocator, we can run them side by side and see
> which is better by numbers.  If yours is better, you'll get no
> argument from me and we can replace xcfmalloc with yours.
> 
> 2) We can agree on a date (sooner rather than later) by which your
> allocator will be completed.  At that time we can compare them and
> integrate the best one by the numbers.
> 


I think replacing allocator every few weeks isn't a good idea. So, I
guess better would be to let me work for about 2 weeks and try the slab
based approach.  If nothing works out in this time, then maybe xcfmalloc
can be integrated after further testing.

Thanks,
Nitin
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