Re: [RFC] Cpu-hotplug: Using the Process Freezer (try2)

[Ingo Molnar]

* Gautham R Shenoy <ego@xxxxxxxxxx> wrote:

> On Wed, Apr 04, 2007 at 12:04:31PM +0200, Ingo Molnar wrote:
> > 
> > yeah, i think you are right - and the TASK_UNINTERRUPTIBLE thing is 
> > not only quite complex, it also breaks the symmetry of freezer use 
> > (sw-suspend obviously cannot freeze uninterruptible tasks). We 
> > should watch whether the current latency of freezing is good enough 
> > in practice.
> 
> Ok. Do you have any specific tests in mind which I can run and post 
> the numbers?
> 
> As of now, I've been stressing the system with (kernbench + ondemand 
> governor) and timing the hotplug operation.

i suspect a fork-intensive application like kernbench should be close to 
the worst-case already. A more IO-intensive workload would maximize the 
uninterruptible-sleep latencies perhaps?

	Ingo
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