From owner-freebsd-hackers Tue Nov 27 16:56:23 2001 Delivered-To: freebsd-hackers@freebsd.org Received: from cain.gsoft.com.au (genesi.lnk.telstra.net [139.130.136.161]) by hub.freebsd.org (Postfix) with ESMTP id 88D8B37B416 for ; Tue, 27 Nov 2001 16:56:14 -0800 (PST) Received: from cain.gsoft.com.au (root@localhost [127.0.0.1]) by cain.gsoft.com.au (8.11.6/8.11.6) with ESMTP id fAS0u4S05484; Wed, 28 Nov 2001 11:26:04 +1030 (CST) (envelope-from doconnor@gsoft.com.au) Message-ID: X-Mailer: XFMail 1.5.0 on FreeBSD X-Priority: 3 (Normal) Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 8bit MIME-Version: 1.0 In-Reply-To: <002901c17775$2f05e900$5a30ddd5@a110c> Date: Wed, 28 Nov 2001 11:26:04 +1030 (CST) From: "Daniel O'Connor" To: Andrey Pugachev Subject: RE: Does FreeBSD support copy-on-write pages? Cc: freebsd-hackers@FreeBSD.org Sender: owner-freebsd-hackers@FreeBSD.ORG Precedence: bulk List-ID: List-Archive: (Web Archive) List-Help: (List Instructions) List-Subscribe: List-Unsubscribe: X-Loop: FreeBSD.ORG On 27-Nov-2001 Andrey Pugachev wrote: > I am just curious, can FreeBSD kernel perform function called copy-on-write > pages in Windows NT world? This is tricky feature of NT memory manager. When > several processes (or threads) allocate identical write-enabled memory > pages, system does not allocate physical memory for each process data at > once. The NT kernel allocates only one copy of write-enabled memory region. FreeBSD does support COW when doing things like loading shared libraries and forking processes. I don't have an exact list or anything, but rather just remembering things mentioned on lists etc.. Maybe worth looking in the list archives for a more authorative answer. --- Daniel O'Connor software and network engineer for Genesis Software - http://www.gsoft.com.au "The nice thing about standards is that there are so many of them to choose from." -- Andrew Tanenbaum To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-hackers" in the body of the message