From: Hans Rosenfeld <hans.rosenfeld@amd.com>
To: Dave Hansen <dave@linux.vnet.ibm.com>
Cc: Hugh Dickins <hugh@veritas.com>, Ingo Molnar <mingo@elte.hu>,
Jeff Chua <jeff.chua.linux@gmail.com>,
Thomas Gleixner <tglx@linutronix.de>,
"H. Peter Anvin" <hpa@zytor.com>,
Gabriel C <nix.or.die@googlemail.com>,
Arjan van de Ven <arjan@linux.intel.com>,
Nishanth Aravamudan <nacc@us.ibm.com>,
linux-kernel@vger.kernel.org, linux-mm@kvack.org
Subject: Re: [PATCH] x86: fix PAE pmd_bad bootup warning
Date: Thu, 8 May 2008 16:34:53 +0200 [thread overview]
Message-ID: <20080508143453.GE12654@escobedo.amd.com> (raw)
In-Reply-To: <1210106579.4747.51.camel@nimitz.home.sr71.net>
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
WARNING: multiple messages have this Message-ID (diff)
From: Hans Rosenfeld <hans.rosenfeld@amd.com>
To: Dave Hansen <dave@linux.vnet.ibm.com>
Cc: Hugh Dickins <hugh@veritas.com>, Ingo Molnar <mingo@elte.hu>,
Jeff Chua <jeff.chua.linux@gmail.com>,
Thomas Gleixner <tglx@linutronix.de>,
"H. Peter Anvin" <hpa@zytor.com>,
Gabriel C <nix.or.die@googlemail.com>,
Arjan van de Ven <arjan@linux.intel.com>,
Nishanth Aravamudan <nacc@us.ibm.com>,
linux-kernel@vger.kernel.org, linux-mm@kvack.org
Subject: Re: [PATCH] x86: fix PAE pmd_bad bootup warning
Date: Thu, 8 May 2008 16:34:53 +0200 [thread overview]
Message-ID: <20080508143453.GE12654@escobedo.amd.com> (raw)
In-Reply-To: <1210106579.4747.51.camel@nimitz.home.sr71.net>
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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next prev parent reply other threads:[~2008-05-08 14:35 UTC|newest]
Thread overview: 75+ messages / expand[flat|nested] mbox.gz Atom feed top
2008-05-06 1:06 Linux 2.6.26-rc1 - pgtable_32.c:178 pmd_bad Jeff Chua
2008-05-06 12:49 ` Ingo Molnar
2008-05-06 13:56 ` Hugh Dickins
2008-05-06 15:04 ` Ingo Molnar
2008-05-06 15:09 ` Linus Torvalds
2008-05-06 15:15 ` Ingo Molnar
2008-05-06 16:16 ` Linus Torvalds
2008-05-06 16:30 ` Ingo Molnar
2008-05-06 15:32 ` Jeremy Fitzhardinge
2008-05-06 16:12 ` Hugh Dickins
2008-05-06 18:39 ` Linus Torvalds
2008-05-06 19:43 ` Hugh Dickins
2008-05-06 19:49 ` [PATCH] x86: fix PAE pmd_bad bootup warning Hugh Dickins
2008-05-06 19:49 ` Hugh Dickins
2008-05-06 20:06 ` Linus Torvalds
2008-05-06 20:06 ` Linus Torvalds
2008-05-06 20:30 ` Hugh Dickins
2008-05-06 20:30 ` Hugh Dickins
2008-05-08 16:07 ` Nishanth Aravamudan
2008-05-08 16:07 ` Nishanth Aravamudan
2008-05-06 20:22 ` Hans Rosenfeld
2008-05-06 20:22 ` Hans Rosenfeld
2008-05-06 20:36 ` Hugh Dickins
2008-05-06 20:36 ` Hugh Dickins
2008-05-07 23:39 ` Nishanth Aravamudan
2008-05-07 23:39 ` Nishanth Aravamudan
2008-05-06 20:42 ` Dave Hansen
2008-05-06 20:42 ` Dave Hansen
2008-05-08 14:34 ` Hans Rosenfeld [this message]
2008-05-08 14:34 ` Hans Rosenfeld
2008-05-08 14:39 ` Hans Rosenfeld
2008-05-08 14:52 ` Dave Hansen
2008-05-08 14:52 ` Dave Hansen
2008-05-08 15:11 ` Hans Rosenfeld
2008-05-08 15:11 ` Hans Rosenfeld
2008-05-08 15:51 ` Dave Hansen
2008-05-08 15:51 ` Dave Hansen
2008-05-08 16:19 ` Hans Rosenfeld
2008-05-08 16:19 ` Hans Rosenfeld
2008-05-08 16:33 ` Nishanth Aravamudan
2008-05-08 16:33 ` Nishanth Aravamudan
2008-05-08 16:51 ` Hans Rosenfeld
2008-05-08 16:51 ` Hans Rosenfeld
2008-05-08 17:16 ` Nishanth Aravamudan
2008-05-08 17:16 ` Nishanth Aravamudan
2008-05-08 18:42 ` Dave Hansen
2008-05-08 18:42 ` Dave Hansen
2008-05-08 18:58 ` Hugh Dickins
2008-05-08 18:58 ` Hugh Dickins
2008-05-08 19:06 ` Dave Hansen
2008-05-08 19:06 ` Dave Hansen
2008-05-08 18:48 ` Hugh Dickins
2008-05-08 18:48 ` Hugh Dickins
2008-05-08 19:49 ` Matt Mackall
2008-05-08 19:49 ` Matt Mackall
2008-05-08 20:08 ` Dave Hansen
2008-05-08 20:08 ` Dave Hansen
2008-05-08 20:02 ` Hans Rosenfeld
2008-05-08 20:02 ` Hans Rosenfeld
2008-05-08 20:16 ` Dave Hansen
2008-05-08 20:16 ` Dave Hansen
2008-05-08 23:15 ` Dave Hansen
2008-05-08 23:15 ` Dave Hansen
2008-05-14 19:01 ` Matt Mackall
2008-05-14 19:01 ` Matt Mackall
2008-05-09 9:03 ` Paul Mundt
2008-05-09 9:03 ` Paul Mundt
2008-05-08 16:42 ` Dave Hansen
2008-05-08 16:42 ` Dave Hansen
2008-05-08 15:44 ` Nishanth Aravamudan
2008-05-08 15:44 ` Nishanth Aravamudan
2008-05-07 4:40 ` Jeff Chua
2008-05-07 4:40 ` Jeff Chua
2008-05-07 5:30 ` Hugh Dickins
2008-05-07 5:30 ` Hugh Dickins
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