Messages in this thread | | | Date | Wed, 31 Aug 2022 11:18:22 +0200 | From | Peter Zijlstra <> | Subject | Re: [PATCH v6 3/5] sched: Enforce user requested affinity |
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On Thu, Aug 25, 2022 at 09:01:17PM -0400, Waiman Long wrote:
> @@ -9352,6 +9381,11 @@ int sched_cpu_activate(unsigned int cpu) > sched_update_numa(cpu, true); > sched_domains_numa_masks_set(cpu); > cpuset_cpu_active(); > + /* > + * Preallocated scratch cpumask > + */ > + if (!rq->scratch_mask) > + rq->scratch_mask = kmalloc(cpumask_size(), GFP_KERNEL); > }
this is too late; I think you'll have to add a sched_cpu_prepare() and simply fail the cpu-up when the allocation fails.
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