xen: cpupool: small optimization when moving between pools

If the domain is already where we want it to go,
there's not much to do indeed.

Signed-off-by: Dario Faggioli <dario.faggioli@citrix.com>
Reviewed-by: Juergen Gross <jgross@suse.com>

diff --git a/xen/common/cpupool.c b/xen/common/cpupool.c
index 5dacc612d10cc100c1c141cf193ee1f82abb09a2..999839444e9b14f0b00a50bd4c1b35266661d4e3 100644 (file)
--- a/xen/common/cpupool.c
+++ b/xen/common/cpupool.c
@@ -232,6 +232,9 @@ static int cpupool_move_domain_locked(struct domain *d, struct cpupool *c)
 {
     int ret;
 
+    if ( unlikely(d->cpupool == c) )
+        return 0;
+
     d->cpupool->n_dom--;
     ret = sched_move_domain(d, c);
     if ( ret )