Date: Thu, 23 Jun 2005 18:01:43 -0700 From: Peter Wemm <peter@wemm.org> To: obrien@freebsd.org Cc: freebsd-arch@freebsd.org Subject: Re: Kernel Dump Message-ID: <200506231801.43669.peter@wemm.org> In-Reply-To: <20050623135337.GA44255@dragon.NUXI.org> References: <1e89cd51050616062241e9e201@mail.gmail.com> <200506222323.26666.peter@wemm.org> <20050623135337.GA44255@dragon.NUXI.org>
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On Thursday 23 June 2005 06:53 am, David O'Brien wrote: > On Wed, Jun 22, 2005 at 11:23:25PM -0700, Peter Wemm wrote: > > IA64 and Sparc systems usually had sparse memory configurations and > > the old raw format didn't have any facility to avoid storing holes. > > .. > > > I've just rewritten the AMD64 crashdump support to use ELF like > > ia64. In fact, I reused most of the ia64 code. We ran into serious > > problems at work, first on the amd64 platform and now also the i386 > > platform. The problem is that x86 machines are increasinly having > > memory holes. The simplistic dump code has no way to skip the > > memory hole and tries to dump things like the AGP frame buffer, pci > > card MMIO space, PCI-Express configuration space (this means > > accessing hardware!!) and so on. > > Hi Peter, > > This is great news! I'm really happy to see this work. Will we be > able to switch to this for 6.0R? I'd very much like for this to happen. I've been testing primarily with amd64, but Paul Saab is doing a quick port to i386 (should be trivial). The good news is that the libkvm impact is pretty much trivial. I was pleasantly surprised. There'll be patches to look at shortly. BTW: It turns out that sparc64 uses its own custom dump format. It uses a custom region descriptor instead of elf's core dump chunk descriptors. I believe it also passes a pointer to its kernel page table. -- Peter Wemm - peter@wemm.org; peter@FreeBSD.org; peter@yahoo-inc.com "All of this is for nothing if we don't go to the stars" - JMS/B5
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