Re: [PATCH 0/3 staging-next] android: Lowmemmorykiller task tree
From: Michal Hocko
Date: Mon Feb 20 2017 - 05:21:41 EST
On Mon 13-02-17 16:42:42, peter enderborg wrote:
> On 02/10/2017 11:27 AM, Michal Hocko wrote:
> > [I have only now see this cover - it answers some of the questions I've
> > had to specific patches. It would be really great if you could use git
> > send-email to post patch series - it just does the right thing(tm)]
> > On Thu 09-02-17 14:21:40, peter enderborg wrote:
> >> Lowmemorykiller efficiency problem and a solution.
> >> Lowmemorykiller in android has a severe efficiency problem. The basic
> >> problem is that the registered shrinker gets called very often without
> >> anything actually happening.
> > Which is an inherent problem because lkml doesn't belong to shrinkers
> > infrastructure.
> Not really what this patch address. I see it as a problem with shrinker
> that there no slow-path-free (scan/count) where it should belong.
> This patch address a specific problem where lot of cpu are wasted
> in low memory conditions.
Let me repeat. The specific problem you are trying to solve is
_inherent_ to how the lmk is designed. Full stop.