linux-kernel - Re: [Xen-devel] [PATCH] Persistent grant maps for xen blk drivers

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Message-Id: <505AF9F6020000780009C909@nat28.tlf.novell.com>
Date:	Thu, 20 Sep 2012 10:11:50 +0100
From:	"Jan Beulich" <JBeulich@...e.com>
To:	"Oliver Chick" <oliver.chick@...rix.com>
Cc:	"xen-devel@...ts.xen.org" <xen-devel@...ts.xen.org>,
	"konrad.wilk@...cle.com" <konrad.wilk@...cle.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [Xen-devel] [PATCH] Persistent grant maps for xen blk
 drivers

>>> On 20.09.12 at 10:51, Oliver Chick <oliver.chick@...rix.com> wrote:
> Ah yes, you're right - rings can accomodate 64 requests. ijc, and myself
> got muddled. It also explains the comment in my summary that we only use
> the first 60-ish persistent grants!
> 
> With multipage rings, this will probably become a function, rather than
> a constant. Does that sound sensible?

Yes, that's what I was expecting. Whether a separate function/
macro is necessary is unclear, as it's simply __RING_SIZE().

Jan

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