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Date: Wed, 19 Oct 2011 23:56:32 +0400
From: Cyrill Gorcunov <gorcunov@gmail.com>
To: Tejun Heo <tj@kernel.org>
Cc: Pavel Emelyanov <xemul@parallels.com>,
        "linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
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        "H. Peter Anvin" <hpa@zytor.com>, Ingo Molnar <mingo@elte.hu>,
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        Daniel Lezcano <dlezcano@fr.ibm.com>,
        Alexey Dobriyan <adobriyan@gmail.com>,
        Linus Torvalds <torvalds@linux-foundation.org>,
        Oleg Nesterov <oleg@redhat.com>
Subject: Re: [patch 5/5] elf: Add support for loading ET_CKPT files
Message-ID: <20111019195632.GB14464@moon>
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On Wed, Oct 19, 2011 at 11:22:28AM -0700, Tejun Heo wrote:
> Hello, Pavel.
> 
> On Wed, Oct 19, 2011 at 01:03:17PM +0400, Pavel Emelyanov wrote:
> > > I don't think this is a good idea.  We already have most of interface
> > > necessary for restoring task state and there's no need to put it into
> > > the kernel as one piece.  If there's something which can't be done
> > > from userland using existing interfaces, let's please discuss what
> > > they are and whether they can be resolved differently first.
> > 
> > The rest API we will require will look too special-purpose (like Cyrill
> > mentioned the ability to set the mm's fields such as start_code, etc).
> 
> I find that quite difficult to agree with.  We're talking about some
> minor additions to prctl against updating exec path to do something it
> was never designed to do + new binary format.

Tejun, regardless the mm_struct entries, what about mapping vdso pages at the
place they had on snapshot time? How would we handle them?

	Cyrill