Date: Sat, 22 Aug 1998 12:20:27 -0500 (EST) From: "John S. Dyson" <dyson@iquest.net> To: julian@whistle.com (Julian Elischer) Cc: dyson@iquest.net, tlambert@primenet.com, sos@FreeBSD.ORG, croot@btp1da.phy.uni-bayreuth.de, regnauld@deepo.prosa.dk, current@FreeBSD.ORG, smp@FreeBSD.ORG Subject: Re: softupdates and smp crash Message-ID: <199808221720.MAA02475@dyson.iquest.net> In-Reply-To: <Pine.BSF.3.95.980822080443.16865B-100000@current1.whistle.com> from Julian Elischer at "Aug 22, 98 08:07:12 am"
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Julian Elischer said: > > > On Sat, 22 Aug 1998, John S. Dyson wrote: > > > I have to chime in here -- some of the "fixes" are work-arounds, and > > there are still underlying VM problems. It might be "good enough" > > for 3.0, but I would suggest preparing for some rework to find the > > root cause for the problem. > > > > We all agree john, but we have not got a suitable set of people who really > understand that code yet... several people are doing "voyages of > discovery" but we do not yet have a "slot-in replacement" for you :-) > That wasn't clear. The "fix" to the page_remove code has really concerned me. The effort was good, but I am still thinking about where the problem really is. I wasn't meaning to put the effort down, and I think that Terry is a person who has a good chance of figuring the code out to the point of being creative with it. (Even though some-people think that he is sometimes "off the wall", I also don't think that some-people listen to him *enough*.) He has been in contact with me, and I am certainly willing to help him. Especially after meetings personally with him, I trust his ability to comprehend and create. (For VM code, I also believe that some of the Alpha people, and others who were helping even when I was actively working on the code, are able to take off where I left it.) None of the VM stuff is brain surgery, but there are some end cases that I believe have BOTH existed since day one, and also some problems that I might have caused. Those who are actually working on/with the code should feel very free to contact me. This strategy has apparently been fairly successful, with not only Terry, but others who have just chatted with me about other technical things. The locking situations and critical region problems are existant throughout the VFS and VM code (and probably in other places too.) I am working to help solve those sorts of problems coherently and completely in another forum. However, when I can help (without totally distracting me in my new work), I will (and do.) FreeBSD's success is still important to me, so using me as a resource when I can help effectively is okay. My current schedule is quite full, but use me when you need to. -- John | Never try to teach a pig to sing, dyson@iquest.net | it makes one look stupid jdyson@nc.com | and it irritates the pig. To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-current" in the body of the message
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