From: Cyrill Gorcunov <gorcunov@gmail.com>
To: Andy Lutomirski <luto@amacapital.net>
Cc: x86@kernel.org, Andrew Morton <akpm@linux-foundation.org>,
Sasha Levin <sasha.levin@oracle.com>,
"linux-mm@kvack.org" <linux-mm@kvack.org>,
Dave Jones <davej@redhat.com>,
LKML <linux-kernel@vger.kernel.org>,
Pavel Emelyanov <xemul@parallels.com>,
"H. Peter Anvin" <hpa@zytor.com>
Subject: Re: [PATCH 3/4] x86,mm: Improve _install_special_mapping and fix x86 vdso naming
Date: Tue, 20 May 2014 21:21:34 +0400 [thread overview]
Message-ID: <20140520172134.GJ2185@moon> (raw)
In-Reply-To: <276b39b6b645fb11e345457b503f17b83c2c6fd0.1400538962.git.luto@amacapital.net>
On Mon, May 19, 2014 at 03:58:33PM -0700, Andy Lutomirski wrote:
> Using arch_vma_name to give special mappings a name is awkward. x86
> currently implements it by comparing the start address of the vma to
> the expected address of the vdso. This requires tracking the start
> address of special mappings and is probably buggy if a special vma
> is split or moved.
>
> Improve _install_special_mapping to just name the vma directly. Use
> it to give the x86 vvar area a name, which should make CRIU's life
> easier.
>
> As a side effect, the vvar area will show up in core dumps. This
> could be considered weird and is fixable. Thoughts?
>
> Cc: Cyrill Gorcunov <gorcunov@openvz.org>
> Cc: Pavel Emelyanov <xemul@parallels.com>
> Signed-off-by: Andy Lutomirski <luto@amacapital.net>
Hi Andy, thanks a lot for this! I must confess I don't yet know how
would we deal with compat tasks but this is 'must have' mark which
allow us to detect vvar area!
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next prev parent reply other threads:[~2014-05-20 17:21 UTC|newest]
Thread overview: 16+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-05-19 22:58 [PATCH 0/4] x86,mm: vdso fixes for an OOPS and /proc/PID/maps Andy Lutomirski
2014-05-19 22:58 ` [PATCH 1/4] x86,vdso: Fix an OOPS accessing the hpet mapping w/o an hpet Andy Lutomirski
2014-05-19 22:58 ` [PATCH 2/4] mm,fs: Add vm_ops->name as an alternative to arch_vma_name Andy Lutomirski
2014-05-19 22:58 ` [PATCH 3/4] x86,mm: Improve _install_special_mapping and fix x86 vdso naming Andy Lutomirski
2014-05-20 17:21 ` Cyrill Gorcunov [this message]
2014-05-20 17:24 ` Andy Lutomirski
2014-05-20 17:47 ` Cyrill Gorcunov
2014-05-20 17:52 ` Andy Lutomirski
2014-05-20 18:01 ` Cyrill Gorcunov
2014-05-20 18:18 ` H. Peter Anvin
2014-05-20 18:24 ` Andy Lutomirski
2014-05-20 18:27 ` H. Peter Anvin
2014-05-20 18:38 ` Andy Lutomirski
2014-05-20 18:39 ` Cyrill Gorcunov
2014-05-20 18:37 ` H. Peter Anvin
2014-05-19 22:58 ` [PATCH 4/4] x86,mm: Replace arch_vma_name with vm_ops->name for vsyscalls Andy Lutomirski
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