Memory hotplug vmem pages

Memory hotplug vmem pages

[Zaslonko Mikhail]

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?

Thanks,
Mikhail Zaslonko

Re: Memory hotplug vmem pages

[Michal Hocko]

[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
-- 
Michal Hocko
SUSE Labs

Re: Memory hotplug vmem pages

[Zaslonko Mikhail]

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
>