[CRIU] VDSO unmap/remap (was Criu on Raspberry pi 2)

[Laurent Dufour]

On 27/04/2016 23:08, Christopher Covington wrote:
> On 04/27/2016 08:15 AM, Pavel Emelyanov wrote:
>> On 04/27/2016 01:09 PM, alex vk wrote:
>>> Hi all, 
>>>
>>> just tried the patch https://lists.openvz.org/pipermail/criu/2016-April/027743.html and it works perfectly, thanks a lot for your help :)
>>> (Criu-dev version + patch criu/pie/Makefile, and Kernel 3.18 from https://github.com/avagin/linux-rpi-criu.git.)
>>>
>>> Does that mean that Criu will not be able to work on the Raspberry pi 2 with a kernel upper than 3.18 ?
>>> (as criu will not support vdso dumping for arm ?)
>>
>> Unfortunately we don't have experts in ARM actively hacking on CRIU.
>> Christopher is helping a lot, so is Dmitry (although his main area
>> in CRIU is x86), but still ARM is not maintained as good as x86 is.
>> So whether or not CRIU will support any particular feature on ARM is
>> something we'd love to have more certainty about.
> 
> Here's my latest attempt at VDSO remap/unmap support for ARM:
> 
> https://codeaurora.org/cgit/quic/kernel/cov-ciru/log/?h=vdso-remap-2016-04-27
> 
> Laurent, if you're able to help review and test the PPC changes, that'd
> be appreciated.

Hi Christopher,

I'm sorry but I'm running out of time at the moment.
As soon as I could get rid of the bugs I've in my plate, I'll do the
review and give it a try.

Cheers,
Laurent.

> 
> The less invasive earlier iteration was greeted with skepticism:
> 
> https://codeaurora.org/cgit/quic/kernel/cov-ciru/log/?h=vdso-remap-2015-10-20
> 
> http://www.spinics.net/lists/linux-arm-msm/msg18441.html
> 
> Thanks,
> Cov
>