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

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Message-ID: <5017A053.9000206@parallels.com>
Date:	Tue, 31 Jul 2012 13:07:31 +0400
From:	Pavel Emelyanov <xemul@...allels.com>
To:	richard -rw- weinberger <richard.weinberger@...il.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>
Subject: Re: [Announce] Checkpoint-restore tool v0.1

On 07/31/2012 12:57 PM, richard -rw- weinberger wrote:
> On Tue, Jul 31, 2012 at 10:53 AM, Pavel Emelyanov <xemul@...allels.com> wrote:
>> On 07/30/2012 02:42 PM, richard -rw- weinberger wrote:
>>> On Mon, Jul 23, 2012 at 10:53 AM, Pavel Emelyanov <xemul@...allels.com> wrote:
>>>> This project is an attempt to implement the checkpoint-restore functionality
>>>> for processes and containers without driving too much code into the kernel tree,
>>>> but putting there "various oddball helper code" instead.
>>>
>>> Is CRIU able to checkpoint a process tree where one or more processes
>>> are traced using ptrace()?
>>
>> No it's not (currently).
>>
>>> crtools seem to use ptrace() to execute parasite system calls.
>>> AFAIK this will only work if the target process is currently not
>>> ptraced() by another process.
>>>
>>
>> Yup, exactly.
> 
> Dammit, I hoped we can get suspend/resume for UserModeLinux for free
> with CRIU. 8-)

Sorry :( However, if you can help with patches on that issue that would be
highly appreciated :)

Thanks,
Pavel


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