Re: [PATCH] mm:memcg: add __GFP_NOWARN in __memcg_schedule_kmem_cache_create

[Michal Hocko]

On Wed 18-04-18 06:31:39, Matthew Wilcox wrote:
> On Wed, Apr 18, 2018 at 11:29:12AM +0900, Minchan Kim wrote:
> > If there are heavy memory pressure, page allocation with __GFP_NOWAIT
> > fails easily although it's order-0 request.
> > I got below warning 9 times for normal boot.
> > 
> > Let's not make user scared.
> 
> Actually, can you explain why it's OK if this fails?  As I understand this
> code, we'll fail to create a kmalloc cache for this memcg.  What problems
> does that cause?

See http://lkml.kernel.org/r/20180418072002.GN17484@xxxxxxxxxxxxxx

-- 
Michal Hocko
SUSE Labs