[Intel-gfx] [PATCH] kernel.h: Add non_block_start/end()

[Michal Hocko]

On Wed 22-05-19 08:13:57, Chris Wilson wrote:
> Quoting Michal Hocko (2019-05-22 07:34:42)
> > On Wed 22-05-19 06:06:31, Tetsuo Handa wrote:
> > [...]
> > > Since OOM notifier will be called after shrinkers are attempted,
> > > can i915 move from OOM notifier to shrinker?
> > 
> > That would be indeed preferable. OOM notifier is an API from hell.
> 
> We were^W are still trying to make the shrinker nonblocking to avoid
> incurring horrible latencies for light direct reclaim. The consequence
> of avoiding heavy work in the shrinker is that we moved it to the oom
> notifier as being the last chance we have to return all (can be literally
> all) the system memory.
> 
> The alternative to using a separate oom notifier would be more
> reclaim/shrinker phases?

do_shrink_slab already knows the reclaim priority. So I guess we can
push it to shrinkers via shrink_control so they can act depending on the
reclaim pressure.

-- 
Michal Hocko
SUSE Labs