Re: [patch 4/4] sched: Distangle worker accounting from rq->lock

From: Ingo Molnar
Date: Thu Jun 23 2011 - 06:45:16 EST

* Tejun Heo <tj@xxxxxxxxxx> wrote:

> The patch description is simply untrue. It does affect how wq
> behaves under heavy CPU load. The effect might be perfectly okay
> but more likely it will result in subtle suboptimal behaviors under
> certain load situations which would be difficult to characterize
> and track down. Again, the trade off (mostly killing of
> ttwu_local) could be okay but you can't get away with just claiming
> "there's no harm".

Well, either it can be measured or not. If you can suggest a specific
testing method to Thomas, please do.


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