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SubjectRe: [PATCH 3/3] sched: Implement interface for cgroup unified hierarchy
On Thu, Sep 17, 2015 at 11:52:45AM -0400, Tejun Heo wrote:
> Hello,
>
> On Thu, Sep 17, 2015 at 05:10:49PM +0200, Peter Zijlstra wrote:
> > Subject: sched: Refuse to unplug a CPU if this will violate user task affinity
> >
> > Its bad policy to allow unplugging a CPU for which a user set explicit
> > affinity, either strictly on this CPU or in case this was the last
> > online CPU in its mask.
> >
> > Either would end up forcing the thread on a random other CPU, violating
> > the sys_sched_setaffinity() constraint.
>
> Shouldn't this at least handle suspend differently? Otherwise any
> userland task would be able to block suspend.

It does, it will allow suspend.


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