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

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Message-ID: <CAFLxGvygCxER3gHfj-onwnm_m6xugOVkynGyJU2CDheD3A2HOQ@mail.gmail.com>
Date:	Tue, 31 Jul 2012 10:57:58 +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>
Subject: Re: [Announce] Checkpoint-restore tool v0.1

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-)

-- 
Thanks,
//richard
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