On Mon 02-08-21 19:33:26, Feng Tang wrote:
[...]

And to be honest, I don't fully understand the current handling for
'bind' policy, will the returning NULL for 'bind' policy open a
sideway for the strict 'bind' limit. 

I do not remember all the details but this is an old behavior that MBIND
policy doesn't apply to kernel allocations in presnce of the movable
zone. Detailed reasoning is not clear to me at the moment, maybe Mel
remembers?
-- 
Michal Hocko
SUSE Labs