Messages in this thread | | | Date | Thu, 8 May 2008 16:34:53 +0200 | From | Hans Rosenfeld <> | Subject | Re: [PATCH] x86: fix PAE pmd_bad bootup warning |
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On Tue, May 06, 2008 at 01:42:59PM -0700, Dave Hansen wrote: > Could you post the code you're using to do this? I have to wonder if > you're leaving a fd open somewhere. Even if you rm the hugepage file, > it'll stay allocated if you have a fd open, or if *someone* is still > mapping it.
A stripped-down program exposing the leak is attached. It doesn't fork or do any other fancy stuff, so I don't see a way it could leave any fd open.
While trying to reproduce this, I noticed that the huge page wouldn't leak when I just mmapped it and exited without explicitly unmapping, as I described before. The huge page is leaked only when the /proc/self/pagemap entry for the huge page is read. The kernel I tested with was 2.6.26-rc1-00179-g3de2403.
> Can you umount your hugetlbfs?
Yes, but the pages remain lost.
Hans
-- %SYSTEM-F-ANARCHISM, The operating system has been overthrown
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