linux-kernel - Re: [Ksummit-2010-discuss] checkpoint-restart: naked patch

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Message-ID: <AANLkTim-M02Z1igZ4LyXH_Qgyzx1iD0ZQkRT6dxcSE3P@mail.gmail.com>
Date:	Fri, 19 Nov 2010 18:38:55 +0200
From:	Alexey Dobriyan <adobriyan@...il.com>
To:	Tejun Heo <tj@...nel.org>
Cc:	Kirill Korotaev <dev@...allels.com>,
	Serge Hallyn <serge.hallyn@...onical.com>,
	Kapil Arya <kapil@....neu.edu>,
	Gene Cooperman <gene@....neu.edu>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Pavel Emelianov <xemul@...allels.com>,
	"Eric W. Biederman" <ebiederm@...ssion.com>,
	Linux Containers <containers@...ts.osdl.org>
Subject: Re: [Ksummit-2010-discuss] checkpoint-restart: naked patch

On Fri, Nov 19, 2010 at 6:32 PM, Tejun Heo <tj@...nel.org> wrote:
> On 11/19/2010 05:27 PM, Alexey Dobriyan wrote:
>> On Fri, Nov 19, 2010 at 6:19 PM, Tejun Heo <tj@...nel.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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