From owner-freebsd-hackers Thu May 16 07:24:34 1996 Return-Path: owner-hackers Received: (from root@localhost) by freefall.freebsd.org (8.7.3/8.7.3) id HAA06773 for hackers-outgoing; Thu, 16 May 1996 07:24:34 -0700 (PDT) Received: from dyson.iquest.net (dyson.iquest.net [198.70.144.127]) by freefall.freebsd.org (8.7.3/8.7.3) with ESMTP id HAA06767 for ; Thu, 16 May 1996 07:24:28 -0700 (PDT) Received: (from root@localhost) by dyson.iquest.net (8.7.5/8.6.9) id JAA13589; Thu, 16 May 1996 09:24:08 -0500 (EST) From: "John S. Dyson" Message-Id: <199605161424.JAA13589@dyson.iquest.net> Subject: Re: A question for the VM gurus..! To: rminnich@Sarnoff.COM (Ron G. Minnich) Date: Thu, 16 May 1996 09:24:08 -0500 (EST) Cc: toor@dyson.iquest.net, jgreco@brasil.moneng.mei.com, hackers@FreeBSD.ORG In-Reply-To: from "Ron G. Minnich" at May 16, 96 08:08:02 am Reply-To: dyson@FreeBSD.ORG X-Mailer: ELM [version 2.4 PL24 ME8] MIME-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit Sender: owner-hackers@FreeBSD.ORG X-Loop: FreeBSD.org Precedence: bulk > > > MADV_WILLNEED appears to fault pages (again, asynchrnously, from what I can > > > tell). > > Hmmm... time to implement kernel threads. > > actually, sunos had async. read-ahead from 1988 on, long before kernel > threads. They just queued an i/o and did not wait for the result. So you > don't absolutely have to have kernel threads. > We used to have async readahead in the VM system (vnode_pager.) It was a bit tricky, and kernel threads might make it simpler. Maybe not? John