[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

Re: [Xen-devel] [PATCH] xen/sched: fix onlining cpu with core scheduling active

On 03.03.20 14:31, Jan Beulich wrote:
On 03.03.2020 13:27, Juergen Gross wrote:
--- a/xen/common/sched/cpupool.c
+++ b/xen/common/sched/cpupool.c
@@ -616,7 +616,8 @@ static int cpupool_cpu_add(unsigned int cpu)
      get_sched_res(cpu)->cpupool = NULL;
cpus = sched_get_opt_cpumask(cpupool0->gran, cpu);
-    if ( cpumask_subset(cpus, &cpupool_free_cpus) )
+    if ( cpumask_subset(cpus, &cpupool_free_cpus) &&
+         cpumask_weight(cpus) >= cpupool_get_granularity(cpupool0) )

Why >= , not == ? And is the other part of the condition needed?

I can switch to ==.

Isn't this rather a condition that could be ASSERT()ed, as CPUs
shouldn't move out of the "free" set before reaching the

Probably, yes. I'll give it some testing and change it in the case
of (expected) success.


Xen-devel mailing list



Lists.xenproject.org is hosted with RackSpace, monitoring our
servers 24x7x365 and backed by RackSpace's Fanatical Support®.