| Date | Thu, 19 Jun 2008 18:16:44 +0100 | From | Andy Whitcroft <> | Subject | Re: 2.6.26-rc5-mm3: BUG large value for HugePages_Rsvd |
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On Thu, Jun 19, 2008 at 11:27:47AM -0500, Jon Tollefson wrote: > After running some of the libhugetlbfs tests the value for > /proc/meminfo/HugePages_Rsvd becomes really large. It looks like it has > wrapped backwards from zero. > Below is the sequence I used to run one of the tests that causes this; > the tests passes for what it is intended to test but leaves a large > value for reserved pages and that seemed strange to me. > test run on ppc64 with 16M huge pages
Yes Adam reported that here yesterday, he found it in his hugetlfs testing. I have done some investigation on it and it is being triggered by a bug in the private reservation tracking patches. It is triggered by the hugetlb test which causes some complex vma splits to occur on a private mapping.
I believe I have the underlying problem nailed and do have some nearly complete patches for this and they should be in a postable state by tommorrow.
-apw
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