Xen devel - Mar 2013 - [PATCH v2] xen: Always ask the scheduler to re-place the vcpu when the affinity changes

It''s probably a good idea to re-evaluate placement whenever the
affinity changes.

This additionally has the benefit of removing scheduler-specific
exceptions introduced in git c/s e6a6fd63.

The conditionals surrounding vcpu_migrate() are left pending a re-work
of the logic to avoid the common case calling vcpu_migrate() twice (once
here, and once in context_saved().

v2:
 - Update commit message to explain conditionals

Signed-off-by: George Dunlap <george.dunlap@eu.citrix.com>
---
 xen/common/schedule.c |    7 ++++---
 1 file changed, 4 insertions(+), 3 deletions(-)

diff --git a/xen/common/schedule.c b/xen/common/schedule.c
index de11110..dbef5af 100644
--- a/xen/common/schedule.c
+++ b/xen/common/schedule.c
@@ -613,9 +613,10 @@ int vcpu_set_affinity(struct vcpu *v, const cpumask_t
*affinity)
     vcpu_schedule_lock_irq(v);
 
     cpumask_copy(v->cpu_affinity, affinity);
-    if ( VCPU2OP(v)->sched_id == XEN_SCHEDULER_SEDF ||
-         !cpumask_test_cpu(v->processor, v->cpu_affinity) )
-        set_bit(_VPF_migrating, &v->pause_flags);
+
+    /* Always ask the scheduler to re-evaluate placement
+     * when changing the affinity */
+    set_bit(_VPF_migrating, &v->pause_flags);
 
     vcpu_schedule_unlock_irq(v);
 
-- 
1.7.9.5