Date: Fri, 8 Jun 2007 18:55:36 +1000 (EST) From: Bruce Evans <brde@optusnet.com.au> To: Jeff Roberson <jroberson@chesapeake.net> Cc: Attilio Rao <attilio@freebsd.org>, freebsd-arch@freebsd.org Subject: Re: Updated rusage patch Message-ID: <20070608185210.W12107@besplex.bde.org> In-Reply-To: <20070607135511.P606@10.0.0.1> References: <20070529105856.L661@10.0.0.1> <200705291456.38515.jhb@freebsd.org> <20070529121653.P661@10.0.0.1> <20070530065423.H93410@delplex.bde.org> <20070529141342.D661@10.0.0.1> <20070530125553.G12128@besplex.bde.org> <20070529201255.X661@10.0.0.1> <20070529220936.W661@10.0.0.1> <20070530201618.T13220@besplex.bde.org> <20070530115752.F661@10.0.0.1> <20070531091419.S826@besplex.bde.org> <20070531010631.N661@10.0.0.1> <20070601154833.O4207@besplex.bde.org> <20070601014601.I799@10.0.0.1> <20070601200348.G6201@delplex.bde.org> <20070601123530.B606@10.0.0.1> <20070604160036.N1084@besplex.bde.org> <46652D17.5090903@FreeBSD.org> <20070605214404.X47001@delplex.bde.org> <20070606152352.H606@10.0.0.1> <20070607135511.P606@10.0.0.1>
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On Thu, 7 Jun 2007, Jeff Roberson wrote: > On Wed, 6 Jun 2007, Jeff Roberson wrote: >> 2) We may lose information between exit1() and thread_exit() due to the >> way p_ru is initialized before we're done exiting. There also seems to be >> a race where wait() operates on a process before it's done in thread_exit() >> which means wait may return rusage information without the child added in! >> The solution will be to fix this race, and then access p_ru directly in >> wait(). I haven't looked at the patch or thought much about the problems yet. A very obvious problem turned up: after killing makeworld with ^C, the times reported are usually almost 0 (even after running 800+ seconds). The times are reasonable if makeworld completes or if a simple foreground process is killed with ^C. This might be (2). Bruce
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