Re: Memory hotplug vmem pages

[Zaslonko Mikhail <zaslonko@linux.bm.com>]

Hello Michal,

Thanks for your response and for the link. I'm gonna play around with that patchset.

Thanks,
Mikhail Zaslonko

On 30.10.2018 14:44, Michal Hocko wrote:
> [Sorry for late response]
> 
> On Fri 12-10-18 10:15:26, Zaslonko Mikhail wrote:
>> Hello Michal,
>>
>> I've read a recent discussion about introducing the memory types for memory
>> hotplug:
>> https://marc.info/?t=153814716600004&r=1&w=2
>>
>> In particular I was interested in the idea of moving vmem struct pages to
>> the hotplugable memory itself. I'm also looking into it for s390 right now.
>> So, in one of your replies you mentioned that you "have proposed (but
>> haven't finished this due to other stuff) a solution for this". Have you
>> covered any part of that solution yet? Could you please point me to any
>> relevant discussions on this matter?
> 
> the patchset has been posted here [1]. I didn't get around to fix the
> hotremove case when you have to be extra carefule to not remove pfn
> range that backs struct pages still in use. I didn't have problems for
> small systems but 2GB memblocks just crashed.
> 
> [1] http://lkml.kernel.org/r/20170801124111.28881-1-mhocko@kernel.org
>