On Mon 27-02-17 18:07:53, Michal Hocko wrote: > On Mon 27-02-17 09:01:09, Tahsin Erdogan wrote: > > On Mon, Feb 27, 2017 at 7:25 AM, Michal Hocko <mho...@kernel.org> wrote: > > > /* > > > * No space left. Create a new chunk. We don't want multiple > > > * tasks to create chunks simultaneously. Serialize and create > > > iff > > > * there's still no empty chunk after grabbing the mutex. > > > */ > > > if (is_atomic) > > > goto fail; > > > > > > right before pcpu_populate_chunk so is this actually a problem? > > > > Yes, this prevents adding more pcpu chunks and so cause "atomic" allocations > > to fail more easily. > > Then I fail to see what is the problem you are trying to fix.
To be more specific. Could you describe what more can we do in the vmalloc layer for GFP_NOWAIT allocations? They certainly cannot sleep and cannot perform the reclaim so you have to rely on the background work. -- Michal Hocko SUSE Labs
