Re: 2.6.16 hugetlbfs problem

From: Mark Rustad
Date: Wed Mar 22 2006 - 18:30:07 EST

On Mar 22, 2006, at 4:13 PM, David S. Miller wrote:

From: Mark Rustad <mrustad@xxxxxxx>
Date: Wed, 22 Mar 2006 16:10:33 -0600

I seem to be having trouble using hugetlbfs with kernel 2.6.16. I
have a small test program that worked with 2.6.16-rc5, but fails with
2.6.16-rc6 or the release. The program is below. Given a path to a
file on a hugetlbfs, it opens/creates the file, mmaps it and tries to
access the first word. On 2.6.16-rc5, it works. On 2.6.16, it hangs
page-faulting until it is killed.

On what platform? Things like hugetlb and address space layout
(you're requesting a specific mmap() address I noticed) are very
platform specific.

This is on a Xeon, without PAE with the 1GB no-highmem memory map, in all three cases. This is a 32-bit kernel running on a Nacona CPU. I also had an unmap call over the range to be mmap-ed, but the failure/ success cases were the same, so I removed it to reduce the test program further.

Mark Rustad, MRustad@xxxxxxx

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