Re: scheduler (sched_4bsd) questions
From: Stephan Uphoff (ups_at_tree.com)
Date: 09/28/04
- Previous message: Stephan Uphoff: "Re: sched_userret priority adjustment patch for sched_4bsd"
- In reply to: Peter Holm: "Re: scheduler (sched_4bsd) questions"
- Next in thread: Peter Holm: "Re: scheduler (sched_4bsd) questions"
- Reply: Peter Holm: "Re: scheduler (sched_4bsd) questions"
- Messages sorted by: [ date ] [ thread ] [ subject ] [ author ]
To: Peter Holm <peter@holm.cc> Date: Mon, 27 Sep 2004 22:52:16 -0400
On Sun, 2004-09-26 at 03:52, Peter Holm wrote:
> On Sat, Sep 25, 2004 at 08:50:45PM -0700, Julian Elischer wrote:
> > Stephan Uphoff wrote:
> >
> > >>Maybe something brutal like:
> > >> if ((curthread->td_ksegrp == kg) &&
> > >> (td->td_priority > curthread->td_priority))
> > >> curthread->td_flags |= TDF_NEEDRESCHED;
> > >>
> > >>in setrunqueue for
> > >>the else case of "if (kg->kg_avail_opennings > 0)"
> > >>would do the trick (without preemption) for the easy but probably more
> > >>common cases?
> > >>
> > >>Maybe I can find some time next week to think about a clean
> > >>fix. I find it always helpful having a small task in mind while reading
> > >>source code.
> > >
> > >
> > >I wrote a fix that should cover all cases.
> > >However I would like to test it a little bit before posting the patch.
> > >Is there any multi-threaded kernel torture program that you can
> > >recommend?
> >
> >
> > Peter Holm (CC'd) has a really cool set of torture tests.
> > he has also seen all sorts of failures others have not (yet) triggered. :-)
> >
> > I'm 'busy" for the next couple of weeks so you may want to communicate
> > directly with him and see if you and he together can figure out some of the
> > things he's
> > been seeing :-)
> >
> > his tests are at:
> > http://www.holm.cc/stress/src/stress.tgz
> >
> > >
> > >Thanks
> > >
> > > Stephan
> > >
>
> I'll be glad to test any patches.
Great.
Can you try the attached patch to see if it changes any of your
previously observed behaviour?
Thanks
Stephan
_______________________________________________
freebsd-arch@freebsd.org mailing list
http://lists.freebsd.org/mailman/listinfo/freebsd-arch
To unsubscribe, send any mail to "freebsd-arch-unsubscribe@freebsd.org"
- text/x-patch attachment: switch_patch__charset_ASCII
- Previous message: Stephan Uphoff: "Re: sched_userret priority adjustment patch for sched_4bsd"
- In reply to: Peter Holm: "Re: scheduler (sched_4bsd) questions"
- Next in thread: Peter Holm: "Re: scheduler (sched_4bsd) questions"
- Reply: Peter Holm: "Re: scheduler (sched_4bsd) questions"
- Messages sorted by: [ date ] [ thread ] [ subject ] [ author ]
Relevant Pages
|
