From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from sc8-sf-mx1-b.sourceforge.net ([10.3.1.11] helo=sc8-sf-mx1.sourceforge.net) by sc8-sf-list1.sourceforge.net with esmtp (Exim 4.30) id 1DjCqc-0001sy-2e for user-mode-linux-devel@lists.sourceforge.net; Fri, 17 Jun 2005 02:09:10 -0700 Received: from dgate1.fujitsu-siemens.com ([217.115.66.35]) by sc8-sf-mx1.sourceforge.net with esmtp (Exim 4.41) id 1DjCqa-0006Qc-G1 for user-mode-linux-devel@lists.sourceforge.net; Fri, 17 Jun 2005 02:09:10 -0700 Message-ID: <42B29330.6050006@fujitsu-siemens.com> From: Bodo Stroesser MIME-Version: 1.0 Subject: Re: [uml-devel] Recent patches of note References: <20050616160728.GA6040@ccure.user-mode-linux.org> <200506162041.27013.blaisorblade@yahoo.it> <42B1C787.6010402@fujitsu-siemens.com> <200506162051.21441.blaisorblade@yahoo.it> <20050616222340.GF9792@ccure.user-mode-linux.org> In-Reply-To: <20050616222340.GF9792@ccure.user-mode-linux.org> Content-Type: text/plain; charset=us-ascii; format=flowed Content-Transfer-Encoding: 7bit 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: Fri, 17 Jun 2005 11:09:04 +0200 To: Jeff Dike Cc: Blaisorblade , user-mode-linux-devel@lists.sourceforge.net Jeff Dike wrote: > On Thu, Jun 16, 2005 at 08:51:20PM +0200, Blaisorblade wrote: > >>>And also it makes tt a bit more removable, if Jeff decides to. >> >>Well, on this point I'd be cautious. >> >>Currently there is no way to even test UML in SMP mode other than using TT >>mode, so at least this must be solved. > > > Yeah, we need to provide SMP on skas. That, and the performance of page fault > handling were the only two things stopping me from removing tt mode in favor > of skas0. > > Bodo and have talked about this, and it seems that skas0 SMP is impractical > because a malicious threaded app could interfere with the stub operation. > > However, skas3 SMP is quite doable, and I think an unsafe skas0 SMP mode > that you can enable with a switch might be OK, too. > > I've since decided that page fault performance is not a show-stopper. It > appears that tt mode is not supportable in recent libcs due to the errno > problem. > > We can get page fault performance back by pushing PTRACE_FAULTINFO into > mainline, which should have been done a long time ago. Same for sysemu, > BTW. > > At this point, I'm -><- this close to deciding to get rid of tt mode in > 2.6.13 or 2.6.14. I want skas0 in mainline early in 2.6.13 so it can > be exercised. Getting skas SMP fixed, and PTRACE_FAULTINFO in mainline > would make me happy about trashing tt mode at some later point. > > Jeff To make skas3 consistent, we should have a mainline version of add-stub-vmas. Also, the LDT-changes should go in at the same time. Bodo ------------------------------------------------------- SF.Net email is sponsored by: Discover Easy Linux Migration Strategies from IBM. Find simple to follow Roadmaps, straightforward articles, informative Webcasts and more! Get everything you need to get up to speed, fast. http://ads.osdn.com/?ad_id=7477&alloc_id=16492&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