G wrote in
news:48214683$0$31676$5a62ac22@per-qv1-newsreader-01.iinet.net.au:

> I read sometime (year or so) ago about a move to include in the 2.6
> kernel the option to have a system call that "binds a process or
> process group to a particular CPU or CPU core" so as to make the
> process ultra effective/efficient as far as CPU cache & memory latency
> was concerned.
>
> Has anything evolved from this discussion? If so what?

If the process group leader sets its affinity (via sched_setaffinity(2)),
all its descendant processes will inherit that affinity. I don't see that
there's anything additional required. (Or perhaps the discussion you saw
was from the time before this was implemented though that discussion would
have taken place far more than a year ago.)

GH

Gil Hamilton wrote:
> If the process group leader sets its affinity (via sched_setaffinity(2)),
> all its descendant processes will inherit that affinity. I don't see that
> there's anything additional required. (Or perhaps the discussion you saw
> was from the time before this was implemented though that discussion would
> have taken place far more than a year ago.)

This is a different mechanism than the one cpusets in cgroups (kernel
2.6.24) right? He could also use that one...

linuxnewbie1234 wrote in
news:48245a1f$0$87956$892e0abb@auth.newsreader.oct anews.com:
> Gil Hamilton wrote:
>> If the process group leader sets its affinity (via
>> sched_setaffinity(2)), all its descendant processes will inherit that
>> affinity. I don't see that there's anything additional required.
>> (Or perhaps the discussion you saw was from the time before this was
>> implemented though that discussion would have taken place far more
>> than a year ago.)
>
> This is a different mechanism than the one cpusets in cgroups (kernel
> 2.6.24) right? He could also use that one...

You're absolutely right. I was not aware of cgroups and cpusets. I just
skimmed the documentation from the 2.6.25 kernel and it looks like that's
exactly what the OP must have seen being discussed a "year or so" ago.
Thanks for the heads-up.

GH