Re: [PATCH 1.2/2] mm: introduce memalloc_nofs_{save,restore} API

[Michal Hocko]

On Wed 27-04-16 13:54:35, Michal Hocko wrote:
> From: Michal Hocko <mhocko@xxxxxxxx>
> 

Ups missed Dave's note about:

> GFP_NOFS context is used for the following 4 reasons currently
> 	- to prevent from deadlocks when the lock held by the allocation
> 	  context would be needed during the memory reclaim
> 	- to prevent from stack overflows during the reclaim because
> 	  the allocation is performed from a deep context already
> 	- to prevent lockups when the allocation context depends on
> 	  other reclaimers to make a forward progress indirectly
> 	- just in case because this would be safe from the fs POV

	- silence lockdep false positives
-- 
Michal Hocko
SUSE Labs