Re: [PATCH v2 1/3] mm,page_alloc: Use {get,put}_online_mems() to get stable zone's values

[Oscar Salvador]

On 2021-06-02 20:37, David Hildenbrand wrote:
> Long story short, using get_online_mems() looks wrong.
>
> Maybe the current lightweight reader/writer protection does serve a 
> purpose?

It was too nice and easy to be true I guess.
Yeah, I missed the point that blocking might be an issue here, and 
hotplug operations can take really long, so not an option.
I must have switched my brain off back there, because now it is just too 
obvious.

Then I guwmess that seqlock must stay and the only thing than can go is 
the pgdat resize lock from the hotplug code.

Meh.

--
Oscar Salvador
SUSE L3