Date: Tue, 8 Jul 2003 15:25:27 -0700 (PDT) From: Julian Elischer <julian@elischer.org> To: FreeBSD current users <current@FreeBSD.ORG> Subject: SMP and setrunnable()- scheduler 4bsd Message-ID: <Pine.BSF.4.21.0307081517250.22588-100000@InterJet.elischer.org>
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It looks tp me that if we make a thread runnable and there is a processor in the idle loop, the idle processor should be kicked in some way to make it go get the newly runnable thread. If the processors are halting in the idle loop however, it may take quite a while for the new work to be noticed.. (possibly up to milliseconds I think) Is there a mechanism to send an IPI to particular processors? or is it just broadcast? I think we would be better served to alter idle_proc(void *dummy) (or maybe choosethread()) to increment or decrement a count of idle processors (atomically of course) so that setrunnable (or it's lower parts) can send that IPI and get the idle processor into actioan as soon as a thread is available. I have not seen any such code but maybe I'm wrong....
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