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

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Message-ID: <CAFLxGvwu8-ii7hDbDfco3JrgKgOK+hsdTN_Q--AHbom0Ni8WYA@mail.gmail.com>
Date:	Tue, 31 Jul 2012 12:08:22 +0200
From:	richard -rw- weinberger <richard.weinberger@...il.com>
To:	Pavel Emelyanov <xemul@...allels.com>
Cc:	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>,
	gorcunov@...nvz.org
Subject: Re: [Announce] Checkpoint-restore tool v0.1

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?
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?

-- 
Thanks,
//richard
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