From owner-freebsd-hackers Tue Oct 3 11:24:58 2000 Delivered-To: freebsd-hackers@freebsd.org Received: from mail.rdc1.va.home.com (ha1.rdc1.va.home.com [24.2.32.66]) by hub.freebsd.org (Postfix) with ESMTP id D8AEF37B503 for ; Tue, 3 Oct 2000 11:24:54 -0700 (PDT) Received: from laptop.baldwin.cx ([24.6.244.187]) by mail.rdc1.va.home.com (InterMail vM.4.01.03.00 201-229-121) with ESMTP id <20001003182454.SWJQ26082.mail.rdc1.va.home.com@laptop.baldwin.cx>; Tue, 3 Oct 2000 11:24:54 -0700 Content-Length: 1195 Message-ID: X-Mailer: XFMail 1.4.0 on FreeBSD X-Priority: 3 (Normal) Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 8bit MIME-Version: 1.0 In-Reply-To: Date: Tue, 03 Oct 2000 11:24:57 -0700 (PDT) From: John Baldwin To: Zhiui Zhang Subject: RE: process scheduling quantum Cc: freebsd-hackers@FreeBSD.org Sender: owner-freebsd-hackers@FreeBSD.ORG Precedence: bulk X-Loop: FreeBSD.ORG 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 -- 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