Re: Crashes with 874bbfe600a6 in 3.18.25

[Tejun Heo]

Hello, Mike.

On Tue, Feb 09, 2016 at 06:04:04PM +0100, Mike Galbraith wrote:
> workqueue: schedule WORK_CPU_UNBOUND work on wq_unbound_cpumask CPUs
> 
> WORK_CPU_UNBOUND work items queued to a bound workqueue always run
> locally.  This is a good thing normally, but not when the user has
> asked us to keep unbound work away from certain CPUs.  Round robin
> these to wq_unbound_cpumask CPUs instead, as perturbation avoidance
> trumps performance.

I don't think doing this by default for everyone is a good idea.  A
lot of workqueue usages tend to touch whatever the scheduler was
touching after all.  Doing things per-cpu is generally a pretty good
thing.

Thanks.

-- 
tejun