[Xen-devel] [PATCH v2 2/2] xen: recalculate per-cpupool credits when updating timeslice

[Juergen Gross <jgross@xxxxxxxx>]

When modifying the timeslice of the credit scheduler in a cpupool the
cpupool global credit value (n_cpus * credits_per_tslice) isn't
recalculated. This will lead to wrong scheduling decisions later.

Do the recalculation when updating the timeslice.

Signed-off-by: Juergen Gross <jgross@xxxxxxxx>
Tested-by: Alan.Robinson <alan.robinson@xxxxxxxxxxxxxx>
---
 xen/common/sched_credit.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/xen/common/sched_credit.c b/xen/common/sched_credit.c
index 8fbbd54..671bbee 100644
--- a/xen/common/sched_credit.c
+++ b/xen/common/sched_credit.c
@@ -1092,6 +1092,7 @@ __csched_set_tslice(struct csched_private *prv, unsigned 
timeslice)
         prv->ticks_per_tslice = 1;
     prv->tick_period_us = prv->tslice_ms * 1000 / prv->ticks_per_tslice;
     prv->credits_per_tslice = CSCHED_CREDITS_PER_MSEC * prv->tslice_ms;
+    prv->credit = prv->credits_per_tslice * prv->ncpus;
 }
 
 static int
-- 
2.6.2


_______________________________________________
Xen-devel mailing list
Xen-devel@xxxxxxxxxxxxx
http://lists.xen.org/xen-devel