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Re: [Xen-devel] [PATCH RESEND 05/12] xen: numa-sched: make space for per-vcpu node-affinity



On 11/05/2013 02:52 PM, Jan Beulich wrote:
On 05.11.13 at 15:35, Dario Faggioli <dario.faggioli@xxxxxxxxxx> 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

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