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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