[Ksummit-2010-discuss] checkpoint-restart: naked patch

Alexey Dobriyan adobriyan at gmail.com
Fri Nov 19 08:38:55 PST 2010


On Fri, Nov 19, 2010 at 6:32 PM, Tejun Heo <tj at 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 at 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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