RE: Re: [PATCH] Support swap a page from user spacetools -- Was RE: [RFC][PATCH] Basic support for page offline

From: "Jiang, Yunhong" <yunhong.jiang@intel.com>
To: Keir Fraser <keir.fraser@eu.citrix.com>,
	Jan Beulich <jbeulich@novell.com>
Cc: Tim Deegan <Tim.Deegan@eu.citrix.com>,
	"xen-devel@lists.xensource.com" <xen-devel@lists.xensource.com>
Subject: RE: Re: [PATCH] Support swap a page from user spacetools -- Was RE: [RFC][PATCH] Basic support for page  offline
Date: Fri, 20 Mar 2009 18:05:10 +0800	[thread overview]
Message-ID: <E2263E4A5B2284449EEBD0AAB751098401CE2D1453@PDSMSX501.ccr.corp.intel.com> (raw)
In-Reply-To: <C5E91A56.59EA%keir.fraser@eu.citrix.com>

Yes, I'm working on that in fact.

-- yhj

Keir Fraser <mailto:keir.fraser@eu.citrix.com> wrote:
> On 20/03/2009 09:59, "Jiang, Yunhong" <yunhong.jiang@intel.com> wrote:
> 
>>>>> Since the guest is suspended, would that matter? Any I/Os that were in
>>>>> flight on suspend will get resubmitted on resume. So the potential races
>>>>> might all be benign.
>>>> 
>>>> I think it may not be resubmited. Backend may have no idea at all if the
>>>> guest is resume quickly, I remember. Or maybe I miss understand the
>>>> interface between backend/frontend..
>>> 
>>> Ah, you do a suspend-cancel/fast-resume?
>> 
>> Yes, that's suggested by Tim and I think that's meet our purpose quite
>> well. 
> 
> Okay, then I suggest you extend XENMEM_exchange so that
> in.mem_flags can
> tell that hypercall to copy data from old to new pages. XENMEMF_copy_data?
> 
> -- Keir