linux-kernel - Re: [PATCH] x86: fix PAE pmd

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Message-Id: <1210106579.4747.51.camel@nimitz.home.sr71.net>
Date:	Tue, 06 May 2008 13:42:59 -0700
From:	Dave Hansen <dave@...ux.vnet.ibm.com>
To:	Hans Rosenfeld <hans.rosenfeld@....com>
Cc:	Hugh Dickins <hugh@...itas.com>, Ingo Molnar <mingo@...e.hu>,
	Jeff Chua <jeff.chua.linux@...il.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	"H. Peter Anvin" <hpa@...or.com>,
	Gabriel C <nix.or.die@...glemail.com>,
	Arjan van de Ven <arjan@...ux.intel.com>,
	Nishanth Aravamudan <nacc@...ibm.com>,
	linux-kernel@...r.kernel.org, linux-mm@...ck.org
Subject: Re: [PATCH] x86: fix PAE pmd_bad bootup warning

On Tue, 2008-05-06 at 22:22 +0200, Hans Rosenfeld wrote:
> I expected that any hugepage that a process had mmapped would
> automatically be returned to the system when the process exits. That was
> not the case, the process exited and the hugepage was lost (unless I
> changed the program to explicitly munmap the hugepage before exiting).
> Removing the hugetlbfs file containing the hugepage also didn't free the
> page.

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. 

Can you umount your hugetlbfs?

-- Dave

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