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: <alpine.DEB.2.02.1507171545170.17378@kaball.uk.xensource.com>
Date:	Fri, 17 Jul 2015 15:45:34 +0100
From:	Stefano Stabellini <stefano.stabellini@...citrix.com>
To:	Julien Grall <julien.grall@...rix.com>
CC:	Stefano Stabellini <stefano.stabellini@...citrix.com>,
	"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 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. 
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