Date: Wed, 5 Jul 2006 07:24:18 +0800 From: David Xu <davidxu@freebsd.org> To: Julian Elischer <julian@elischer.org> Cc: Daniel Eischen <deischen@freebsd.org>, Robert Watson <rwatson@freebsd.org>, freebsd-threads@freebsd.org Subject: Re: Strawman proposal: making libthr default thread implementation? Message-ID: <200607050724.18740.davidxu@freebsd.org> In-Reply-To: <200607050706.33502.davidxu@freebsd.org> References: <20060703101554.Q26325@fledge.watson.org> <44AAC47F.2040508@elischer.org> <200607050706.33502.davidxu@freebsd.org>
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On Wednesday 05 July 2006 07:06, David Xu wrote: > Cann't solaris's user usage scheduler will solve the problem ? if I > recall it correctly, the decay factor in 4bsd scheduler can be changed > dynamically for a thread, the decay factor can be stored in thread > structure, and timeslice can be dynamically changed, also can be in thread > structure, unlike current implementation, timeslice is fixed, this may > make fair scheduling possible without ksegrp. > > Also will the roundrobin callout preempt a thread ? if that's true, then > when every timeslice tick, a thread exhausted its timeslice is put at head > of runqueue, isn't it a bug ? the callout is somewhat random for a thread, > might not be a problem... OK, I just digged out the paper in my disks, here is the reference: http://people.freebsd.org/~davidxu/doc/solaris2.pdf [the address thread@freebsd.org is removed] I think we really should do more work in kernel scheduler, and remove ksegrp. David Xu
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