Re: [PATCH repost] sched: export sched_set/getaffinity to modules

[Michael S. Tsirkin]

On Thu, Jul 01, 2010 at 02:46:35PM +0200, Peter Zijlstra wrote:
> On Thu, 2010-07-01 at 14:34 +0200, Peter Zijlstra wrote:
> > On Thu, 2010-07-01 at 15:23 +0300, Michael S. Tsirkin wrote:
> > > 
> > > The patch using this is here:
> > > http://www.mail-archive.com/kvm@xxxxxxxxxxxxxxx/msg35411.html
> > > 
> > > It simply copies the affinity from the parent when thread is created.
> > 
> > Sounds like policy, not something the kernel should do..
> 
> The alternative would be using clone() instead of thread_create() and
> inherit everything from the creating task.
> Inheriting from kthreadd and then undoing some aspects just sounds
> like daft policy that really ought to be in userspace.

Yes, that's basically what this patchset is trying to do:
create a workqueue inheriting everything from the creating task.
Sridhar started with an API to do exactly this:
http://linux.derkeiler.com/Mailing-Lists/Kernel/2010-05/msg07478.html

Then we switched to raw kthread to avoid stepping on cwq toes.
Maybe it makes sense to add kthread_clone (in addition to
kthread_create) that would do what you suggest?
If yes, any hints on an implementation?


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