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Date: Fri, 19 Nov 2010 18:38:55 +0200
Message-ID: <AANLkTim-M02Z1igZ4LyXH_Qgyzx1iD0ZQkRT6dxcSE3P@mail.gmail.com>
Subject: Re: [Ksummit-2010-discuss] checkpoint-restart: naked patch
From: Alexey Dobriyan <adobriyan@gmail.com>
To: Tejun Heo <tj@kernel.org>
Cc: Kirill Korotaev <dev@parallels.com>,
        Serge Hallyn <serge.hallyn@canonical.com>,
        Kapil Arya <kapil@ccs.neu.edu>, Gene Cooperman <gene@ccs.neu.edu>,
        "linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
        Pavel Emelianov <xemul@parallels.com>,
        "Eric W. Biederman" <ebiederm@xmission.com>,
        Linux Containers <containers@lists.osdl.org>
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On Fri, Nov 19, 2010 at 6:32 PM, Tejun Heo <tj@kernel.org> wrote:
> On 11/19/2010 05:27 PM, Alexey Dobriyan wrote:
>> On Fri, Nov 19, 2010 at 6:19 PM, Tejun Heo <tj@kernel.org> wrote:
>>>> The paragon of absurdity is struct task_struct::did_exec .
>>>
>>> Yeah, then go and figure how to do that in a way which would be useful
>>> for other purposes too instead of trying to shove the whole
>>> checkpointer inside the kernel. ?It sure would be harder but hey
>>> that's the way it is.
>>
>> System call for one bit? This is ridiculous.
>
> Why not just a flag in proc entry? ?It's a frigging single bit.

Because /proc/*/did_exec useless to anyone but C/R (even for reading!).

Because code is much simpler:

    tsk->did_exec = !!tsk_img->did_exec;
+
    __u8 did_exec;
--
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