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

[Uladzislau Rezki]

On Wed, Apr 01, 2020 at 09:09:58AM +0200, Michal Hocko wrote:
> 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.
> 
OK. Then we can use GFP_ATOMIC | __GFP_RETRY_MAYFAIL to try in more harder
way.

Thanks!

--
Vlad Rezki