From mboxrd@z Thu Jan  1 00:00:00 1970
From: George Dunlap <george.dunlap@eu.citrix.com>
Subject: Re: [PATCH RESEND 05/12] xen: numa-sched: make space
 for per-vcpu node-affinity
Date: Tue, 5 Nov 2013 15:03:14 +0000
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To: Jan Beulich <JBeulich@suse.com>
Cc: Marcus Granado <Marcus.Granado@eu.citrix.com>, Justin Weaver <jtweaver@hawaii.edu>, Ian Campbell <Ian.Campbell@citrix.com>, Li Yechen <lccycc123@gmail.com>, Andrew Cooper <Andrew.Cooper3@citrix.com>, Dario Faggioli <dario.faggioli@citrix.com>, Ian Jackson <Ian.Jackson@eu.citrix.com>, Matt Wilson <msw@amazon.com>, xen-devel <xen-devel@lists.xenproject.org>, Daniel De Graaf <dgdegra@tycho.nsa.gov>, Keir Fraser <keir@xen.org>, Elena Ufimtseva <ufimtseva@gmail.com>, Juergen Gross <juergen.gross@ts.fujitsu.com>
List-Id: xen-devel@lists.xenproject.org

On 11/05/2013 02:52 PM, Jan Beulich wrote:
>>>> On 05.11.13 at 15:35, Dario Faggioli <dario.faggioli@citrix.com> wrote:
>> @@ -197,6 +199,13 @@ struct vcpu
>>       /* Used to restore affinity across S3. */
>>       cpumask_var_t    cpu_affinity_saved;
>>
>> +    /*
>> +     * Bitmask of CPUs on which this VCPU prefers to run. For both this
>> +     * and auto_node_affinity access is serialized against
>> +     * v->domain->node_affinity_lock.
>> +     */
>> +    cpumask_var_t    node_affinity;
>
> This all looks quite sensible, except for the naming here: We
> already have a node_affinity field in struct domain, having a
> meaning that one can expect with this name. So you break
> both consistency and the rule of least surprise here. How
> about just "preferred_cpus"?

Actually, would it make more sense to remove node_affinity from the 
domain struct, and have the tools manually set the node_affinity for the 
various vcpus if the user attempts to set the "domain numa affinity"?

  -George