Date: Mon, 28 Sep 2009 12:25:07 -0500 From: Alan Cox <alc@cs.rice.edu> To: Daniel O'Connor <doconnor@gsoft.com.au> Cc: Attilio Rao <attilio@freebsd.org>, alc@freebsd.org, freebsd-stable@freebsd.org, John Baldwin <jhb@freebsd.org> Subject: Re: 8.0-RC1 panic attaching ppc Message-ID: <4AC0F173.10300@cs.rice.edu> In-Reply-To: <200909281134.04010.doconnor@gsoft.com.au> References: <200909232322.51060.doconnor@gsoft.com.au> <200909260824.39985.doconnor@gsoft.com.au> <4ABE81C5.2010009@cs.rice.edu> <200909281134.04010.doconnor@gsoft.com.au>
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Daniel O'Connor wrote: > On Sun, 27 Sep 2009, Alan Cox wrote: > >> Ok, now I can explain what is happening. The kernel is using 1GB >> pages to implement the direct map. Unfortunately, pmap_extract() >> doesn't know how to handle a 1GB page mapping. pmap_kextract() only >> works by an "accident" of its different implementation. In other >> words, it should not be relied upon to work either. >> >> Please revert whatever patch John gave you and try the attached >> patch. It simply disables the use of 1GB page mapping by the direct >> map. >> > > Your patch fixes (works around?) the problem. > Thanks. I've committed the patch. Yes, it's a work around. Fortunately(?), on my test machine, I don't see any measurable effect from disabling the use of 1GB pages by the direct map. Alan
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