linux-kernel - Re: [Announce] Checkpoint-restore tool v0.1

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Message-ID: <20120731101603.GD2007@moon>
Date:	Tue, 31 Jul 2012 14:16:03 +0400
From:	Cyrill Gorcunov <gorcunov@...nvz.org>
To:	richard -rw- weinberger <richard.weinberger@...il.com>
Cc:	Pavel Emelyanov <xemul@...allels.com>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	"lwn@....net" <lwn@....net>, "criu@...nvz.org" <criu@...nvz.org>,
	"users@...nvz.org" <users@...nvz.org>,
	Containers <containers@...ts.linux-foundation.org>,
	cgroups mailinglist <cgroups@...r.kernel.org>
Subject: Re: [Announce] Checkpoint-restore tool v0.1

On Tue, Jul 31, 2012 at 12:08:22PM +0200, richard -rw- weinberger wrote:
> On Tue, Jul 31, 2012 at 11:54 AM, Pavel Emelyanov <xemul@...allels.com> wrote:
> >> Yeah, but I fear it's not that easy.
> >> We'd have to change crtools to work without ptrace().
> >
> > Well, this is hard. Using ptrace saved us from having many special-purpose
> > APIs for dumping various stuff (there will be an article about it). Thus I
> > don't know which way is simpler -- stop using ptrace or teach ptrece to allow
> > several tracers to attach to one task %)
> 
> Allowing multiple tracers in a safe way is IMHO even more harder.
> 
> BTW:  While reading prctl_set_mm() I noticed two things.
> 1.  Why isn't the return value of find_vma() verified?

prctl_set_mm
	vma = find_vma(mm, addr);
	...
	if (!vma) {
		error = -EFAULT;
		goto out;
	}

these values are used in procfs statistics only. So I don't get
which verify you mean here.

> It looks like one can set an addr which does not belong to any vma.
> 2. What will happen if addr is not page aligned?

you'll have a bit weird output in procfs stat (probably I should add
page alignment check here).

	Cyrill
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