20 Jan
2014
20 Jan
'14
3 p.m.
On 20 January 2014 19:29, Lei Wen adrian.wenl@gmail.com wrote:
Hi Viresh,
Hi Lei,
I have one question regarding unbounded workqueue migration in your case. You use hotplug to migrate the unbounded work to other cpus, but its cpu mask would still be 0xf, since cannot be changed by cpuset.
My question is how you could prevent this unbounded work migrate back to your isolated cpu? Seems to me there is no such mechanism in kernel, am I understand wrong?
These workqueues are normally queued back from workqueue handler. And we normally queue them on the local cpu, that's the default behavior of workqueue subsystem. And so they land up on the same CPU again and again.