Re: [QUERY]: Is using CPU hotplug right for isolating CPUs?

[Peter Zijlstra]

On Wed, Jan 15, 2014 at 04:17:26PM +0530, Viresh Kumar wrote:
> On 15 January 2014 16:08, Peter Zijlstra <peterz@xxxxxxxxxxxxx> wrote:
> > Nah, its just ugly and we should fix it. You need to be careful to not
> > place tasks in a cpuset you're going to unplug though, that'll give
> > funny results.
> 
> Okay. So how do you suggest to get rid of cases like a work queued
> on CPU1 initially and because it gets queued again from its work handler,
> it stays on the same CPU forever.

We should have a cpuset.quiesce control or something that moves all
timers out.

> And then there were timer overflow events that occur because hrtimer
> is started by tick-sched stuff for 450 seconds later in time.

-ENOPARSE
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