Re: [PATCH RFC] rcu/tree: Use GFP_MEMALLOC for alloc memory to free memory pattern

[Michal Hocko]

On Tue 31-03-20 18:12:15, Uladzislau Rezki wrote:
> > 
> > __GFP_ATOMIC | __GFP_HIGH is the way to get an additional access to
> > memory reserves regarless of the sleeping status.
> > 
> Michal, just one question here regarding proposed flags. Can we also
> tight it with __GFP_RETRY_MAYFAIL flag? Means it also can repeat a few
> times in order to increase the chance of being success.

yes, __GFP_RETRY_MAYFAIL is perfectly valid with __GFP_ATOMIC. Please
note that __GFP_ATOMIC, despite its name, doesn't imply an atomic
allocation which cannot sleep. Quite confusing, I know. A much better
name would be __GFP_RESERVES or something like that.

-- 
Michal Hocko
SUSE Labs