On Sun, Sep 11, 2016 at 09:14:58PM -0700, Joonwoo Park wrote: > A discrepancy between cpu_online_mask and cpuset's effective_cpus > mask is inevitable during hotplug since cpuset defers updating of > effective_cpus mask using a workqueue, during which time nothing > prevents the system from more hotplug operations. For that reason > guarantee_online_cpus() walks up the cpuset hierarchy until it finds > an intersection under the assumption that top cpuset's effective_cpus > mask intersects with cpu_online_mask even with such a race occurring. > > However a sequence of CPU hotplugs can open a time window, during which > none of the effective CPUs in the top cpuset intersect with > cpu_online_mask. Applied to cgroup/for-4.8-fixes. Thanks. -- tejun -- To unsubscribe from this list: send the line "unsubscribe stable" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html