[Xen-devel] [PATCH] sched_rt: Improved nested virtualization performance

[Tianyang Chen <tianyangpenn@xxxxxxxxx>]

In nested virtualization, choosing the smaller value for the
time slice between the MAX_SCHEDULE and the budget will cause
high host CPU usage.

Signed-off-by: Tianyang Chen <tianyangpenn@xxxxxxxxx>
---
 xen/common/sched_rt.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/xen/common/sched_rt.c b/xen/common/sched_rt.c
index 4372486..9da3f35 100644
--- a/xen/common/sched_rt.c
+++ b/xen/common/sched_rt.c
@@ -889,7 +889,7 @@ rt_schedule(const struct scheduler *ops, s_time_t now, 
bool_t tasklet_work_sched
         }
     }
 
-    ret.time = MIN(snext->budget, MAX_SCHEDULE); /* sched quantum */
+    ret.time = MAX_SCHEDULE; /*should be used in nested virtualization*/
     ret.task = snext->vcpu;
 
     /* TRACE */
-- 
1.7.9.5


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