linux-kernel - Re: [Xen-devel] [PATCH v2 09/20] xen/biomerge: Don't allow biovec to be merge when Linux is not using 4KB page

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Message-ID: <55A9153D.3060205@citrix.com>
Date:	Fri, 17 Jul 2015 15:46:21 +0100
From:	Julien Grall <julien.grall@...rix.com>
To:	Stefano Stabellini <stefano.stabellini@...citrix.com>
CC:	Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>,
	<ian.campbell@...rix.com>, <linux-kernel@...r.kernel.org>,
	David Vrabel <david.vrabel@...rix.com>,
	<xen-devel@...ts.xenproject.org>,
	Boris Ostrovsky <boris.ostrovsky@...cle.com>,
	<linux-arm-kernel@...ts.infradead.org>
Subject: Re: [Xen-devel] [PATCH v2 09/20] xen/biomerge: Don't allow biovec
 to be merge when Linux is not using 4KB page

On 17/07/15 15:45, Stefano Stabellini wrote:
> On Fri, 17 Jul 2015, Julien Grall wrote:
>> On 17/07/15 14:20, Stefano Stabellini wrote:
>>> We would have to run some benchmarks, but I think it would still be a
>>> win. We should write an ad-hoc __pfn_to_mfn translation function that
>>> operates on a range of pfns and simply checks whether an entry is
>>> present in that range. It should be just as fast as __pfn_to_mfn. I
>>> would definitely recommend it.
>>
>> I'd like to see a basic support of 64KB support on Xen pushed in Linux
>> upstream before looking to possible improvement in the code. Can we
>> defer this as the follow-up of this series?
> 
> Yes, maybe add a TODO comment in the code. 

Will do.

Regards,

-- 
Julien Grall
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