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[v2,2/2] xen: recalculate per-cpupool credits when updating timeslice

Message ID 1454412582-3263-3-git-send-email-jgross@suse.com (mailing list archive)
State New, archived
Headers show

Commit Message

Jürgen Groß Feb. 2, 2016, 11:29 a.m. UTC 
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@suse.com>
Tested-by: Alan.Robinson <alan.robinson@ts.fujitsu.com>
---
 xen/common/sched_credit.c | 1 +
 1 file changed, 1 insertion(+)
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Patch

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