On Sat, Sep 12, 2015 at 10:40:07AM -0400, Tejun Heo wrote: > So, one of the problems is that the kernel can't have tasks w/o > runnable CPUs, so we have to some workaround when, for whatever > reason, a task ends up with no CPU that it can run on. No, just refuse that configuration. > You say cpuset isn't a layering thing but that simply isn't true. > It's a cgroup-scope CPU mask. It layers atop task affinities > restricting what they can be configured to, limiting the effective > cpumask to the intersection of actually existing CPUs and overriding > individual affinity setting when the intersection doesn't exist. No, just fail. > The kernel does not update all CPU affinity masks when a CPU goes down > or comes up. I'd be happy to fail a CPU down for user tasks where this is the last runnable CPU of. -- To unsubscribe from this list: send the line "unsubscribe cgroups" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
