From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from sc8-sf-mx1-b.sourceforge.net ([10.3.1.91] helo=mail.sourceforge.net) by sc8-sf-list1.sourceforge.net with esmtp (Exim 4.30) id 1ExBDX-0007Cz-Qr for user-mode-linux-devel@lists.sourceforge.net; Thu, 12 Jan 2006 14:46:51 -0800 Received: from saraswathi.solana.com ([198.99.130.12]) by mail.sourceforge.net with esmtps (TLSv1:AES256-SHA:256) (Exim 4.44) id 1ExBDV-00032N-Fh for user-mode-linux-devel@lists.sourceforge.net; Thu, 12 Jan 2006 14:46:51 -0800 From: Jeff Dike Subject: Re: [uml-devel] high-performance system calls using vsyscall Message-ID: <20060112233848.GA945@ccure.user-mode-linux.org> References: <3524bf1f0601120902v3812029l4d8ba5411b53f36f@mail.gmail.com> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <3524bf1f0601120902v3812029l4d8ba5411b53f36f@mail.gmail.com> Sender: user-mode-linux-devel-admin@lists.sourceforge.net Errors-To: user-mode-linux-devel-admin@lists.sourceforge.net List-Unsubscribe: , List-Id: The user-mode Linux development list List-Post: List-Help: List-Subscribe: , List-Archive: Date: Thu, 12 Jan 2006 18:38:48 -0500 To: Young Koh Cc: user-mode-linux-devel@lists.sourceforge.net On Thu, Jan 12, 2006 at 12:02:16PM -0500, Young Koh wrote: > I found an old post discussing the possibility of turning a system > call into a procedure call using vsyscall. Is it really implemented in > recent versions? I tested with recent Linux/UML kernels and glibcs but > system calls don't seem that fast. so, i guess it's not implemented > yet? In the generic kernel (or in whatever arches have the vsyscall page), it's used for only a small number of system calls. In a tt-style UML, where the UML kernel is in the same address space as the process, this could be used for all system calls, where you would just jump from there into the UML kernel. I think you would have to fiddle libc to make all of the system calls fo this. Jeff ------------------------------------------------------- This SF.net email is sponsored by: Splunk Inc. Do you grep through log files for problems? Stop! Download the new AJAX search engine that makes searching your log files as easy as surfing the web. DOWNLOAD SPLUNK! http://ads.osdn.com/?ad_id=7637&alloc_id=16865&op=click _______________________________________________ User-mode-linux-devel mailing list User-mode-linux-devel@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/user-mode-linux-devel