Re: 2.2.2: 2 thumbs up from lm

Richard Gooch (rgooch@atnf.csiro.au)
Thu, 25 Feb 1999 21:06:20 +1100

Ingo Molnar writes:
>
> On Thu, 25 Feb 1999, Richard Gooch wrote:
>
> > > The good news is that we haven't even reached the limit
> > > yet with scheduler and VM optimizations. With a bit of
> >
> > Yep. I've got some invasive changes to the scheduler, task structure
> > and associated bits and pieces in mind. And nope, it's not the RT
> > queue stuff. It's something orthogonal. But it should be good :-)
>
> what misfeatures (if any) does it fix?

Well, I wouldn't go so far as to say it fixes misfeatures. It's more
about optimsations. It basically a result of the RT queue work I did,
which showed that performance is being hampered by cache line
aliasing.

My basic idea is to pack all the per-task information necessary for
the scheduler to walk the run queue (and no more) into a new
structure. Call it struct task_sched. This will be the framework for
the run queue. All the other cruft is left in struct task and a
forwards pointer (and possibly a backwards pointer as well) takes you
from the struct task_sched to the struct task.

Regards,

Richard....

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