SEDF: avoid gathering vCPU-s on pCPU0

The introduction of vcpu_force_reschedule() in 14320:215b799fa181 was
incompatible with the SEDF scheduler: Any vCPU using
VCPUOP_stop_periodic_timer (e.g. any vCPU of half way modern PV Linux
guests) ends up on pCPU0 after that call. Obviously, running all PV
guests' (and namely Dom0's) vCPU-s on pCPU0 causes problems for those
guests rather sooner than later.

So the main thing that was clearly wrong (and bogus from the beginning)
was the use of cpumask_first() in sedf_pick_cpu(). It is being replaced
by a construct that prefers to put back the vCPU on the pCPU that it
got launched on.

However, there's one more glitch: When reducing the affinity of a vCPU
temporarily, and then widening it again to a set that includes the pCPU
that the vCPU was last running on, the generic scheduler code would not
force a migration of that vCPU, and hence it would forever stay on the
pCPU it last ran on. Since that can again create a load imbalance, the
SEDF scheduler wants a migration to happen regardless of it being
apparently unnecessary.

Of course, an alternative to checking for SEDF explicitly in
vcpu_set_affinity() would be to introduce a flags field in struct
scheduler, and have SEDF set a "always-migrate-on-affinity-change"
flag.

Signed-off-by: Jan Beulich <jbeulich@suse.com>
Acked-by: Keir Fraser <keir@xen.org>

1 files changed, 2 insertions, 1 deletions

diff --git a/xen/common/sched_sedf.c b/xen/common/sched_sedf.c
index 27fac36494..d1812b6c48 100644
--- a/xen/common/sched_sedf.c
+++ b/xen/common/sched_sedf.c
@@ -397,7 +397,8 @@ static int sedf_pick_cpu(const struct scheduler *ops, struct vcpu *v)
 
     online = cpupool_scheduler_cpumask(v->domain->cpupool);
     cpumask_and(&online_affinity, v->cpu_affinity, online);
-    return cpumask_first(&online_affinity);
+    return cpumask_cycle(v->vcpu_id % cpumask_weight(&online_affinity) - 1,
+                         &online_affinity);
 }
 
 /*