Date: Sat, 06 Nov 2004 18:58:42 -0800 From: Julian Elischer <julian@elischer.org> To: John-Mark Gurney <gurney_j@resnet.uoregon.edu> Cc: Devesh Shah <shah@docomolabs-usa.com> Subject: Re: Loadable Scheduler in Freebsd Message-ID: <418D8F62.4000602@elischer.org> In-Reply-To: <20041106192122.GE22681@funkthat.com> References: <003f01c4c2c5$17e2c560$8a6115ac@dcml.docomolabsusa.com> <20041106192122.GE22681@funkthat.com>
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John-Mark Gurney wrote:
> Devesh Shah wrote this message on Thu, Nov 04, 2004 at 15:22 -0800:
>
>>Based on the SYSINIT framework, I have made ULE scheduler as a loadable module but have not quite
>>figured how to migrate from default 4bsd to newly loaded ule scheduler or is it possible at all.
>
>
> As someone suggested, switches schedulers would be very complex..
>
> what would be much more doable is require a scheduler module loaded by
> loader, and then select which scheduler from the loader... (though I
> don't know how many ifdef's outside scheduler modules exist today)..
ONE
in kern_kse.c:
td->td_pflags &= ~TDP_CAN_UNBIND;
td2 = thread_schedule_upcall(td, ku);
#ifdef SCHED_4BSD
if (flags & SW_INVOL || nextthread) {
setrunqueue(td2, SRQ_YIELDING);
} else {
/* Keep up with reality.. we have one extra thread
* in the picture.. and it's 'running'.
*/
return td2;
}
#else
setrunqueue(td2, SRQ_YIELDING);
#endif
it would be safe to always use the Non-4bsd path
>
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