Date: Tue, 03 Oct 2000 11:24:57 -0700 (PDT) From: John Baldwin <jhb@FreeBSD.org> To: Zhiui Zhang <zzhang@cs.binghamton.edu> Cc: freebsd-hackers@FreeBSD.org Subject: RE: process scheduling quantum Message-ID: <XFMail.001003112457.jhb@FreeBSD.org> In-Reply-To: <Pine.SOL.4.21.0010031017410.16764-100000@jade>
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On 03-Oct-00 Zhiui Zhang wrote: > > On Tue, 3 Oct 2000, John Baldwin wrote: >> >> On 02-Oct-00 Zhiui Zhang wrote: >> > >> > Suppose a process is scheduled to run, will it run until its quantum ends >> > unless it calls tsleep() on his own? In other words, is it possible for a >> > process to give up its quantum earlier without having it to do so >> > voluntarily? Thanks. >> >> If an interrupt occurs and puts a thread on the run queue (which will have >> higher priority than the currently running proceess) then the current >> process will be stopped so that the interrupt thread can run. > > Thanks. But I guess that you are talking about the new SMP threads. For > FreeBSD 4.1-Release, I am not sure this can happen. I am wondering any > time taken by interrupts (hardware or software) will be accounted to the > current process. If so, the process's quantum is stolen away and nothing > useful for that process is done. Yes, in pre-SMPng, interrupts use up part of the current process's quantum. -- John Baldwin <jhb@FreeBSD.org> -- http://www.FreeBSD.org/~jhb/ PGP Key: http://www.baldwin.cx/~john/pgpkey.asc "Power Users Use the Power to Serve!" - http://www.FreeBSD.org/ To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-hackers" in the body of the message
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