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SubjectRe: Processor sets (pset) for linux kernel 2.5/2.6?
On Sat, Apr 12, 2003 at 12:20:35PM +0100, Shaheed R. Haque wrote:
>
> Hi,
>
> Looking through the archive etc., I cannot see any references to pset
> functionality more recently than
>
> http://www.ussg.iu.edu/hypermail/linux/kernel/9904.1/0521.html
>
> announcing an updated patch in April 1999. Are there any plans out there to
> include this, or similar functionality in 2.5/2.6? I'm particularly interested
> in getting exclusive access to a CPU (plus or minus HT support, for now anyway).

Shaheed, I think that task->cpu_allowed covers your need, since it
describes a mask of cpu�'s allowed to run the task. CPU migration, for
example, is implemented in current scheduler by saving the
current cpu_allowed, forcing it to contain only the destination CPU and
then restoring it.

I think it's carried over by fork(), but have been unable to find
it on the sources.

HT is accounted as a NUMA SMP system with strong memory affinity
for his 2 cores, so that when running 2 HT processors (2+2 cores),
the tasks are kept preferably on the same HT processor and just bounce
cores, since they share the same cache (don't know exactly L1, L2 or
both, tough).

Greets, Antonio.
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