migrate vmalloc area for memory hot-remove

migrate vmalloc area for memory hot-remove

[Vasilis Liaskovitis]

Hi Yasuaki,

in your memory hotplug slides at LinuxCon Japan 2013, you mention "migrate
vmalloc area" as one of the TODO items (slide 30 / 31):

http://events.linuxfoundation.org/sites/events/files/lcjp13_ishimatsu.pdf

can you further explain this problem? Isn't this case handled already from the
current page migration code? 

Do you have a specific testcase that can trigger this issue?

thanks,

- Vasilis

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Re: migrate vmalloc area for memory hot-remove

[Yasuaki Ishimatsu]

Hi Vasilis,

(2013/07/16 1:37), Vasilis Liaskovitis wrote:
> Hi Yasuaki,
>
> in your memory hotplug slides at LinuxCon Japan 2013, you mention "migrate
> vmalloc area" as one of the TODO items (slide 30 / 31):
>
> http://events.linuxfoundation.org/sites/events/files/lcjp13_ishimatsu.pdf
>

> can you further explain this problem? Isn't this case handled already from the
> current page migration code?
>
> Do you have a specific testcase that can trigger this issue?

This item aims to increase removable memory.

When we use memory hot remove, we need to use ZONE_MOVABLE. But the use of
the zone is limited. The zone can treat only anonymous page and page cache.

So I want to enhance the zone to treat vmalloc area. But currently there
is no patch.

Thanks,
Yasuaki Ishimatsu

>
> thanks,
>
> - Vasilis
>


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