Re: [Lsf-pc] [RFC 0/2] opportunistic memory reclaim of a killed process

Suren Baghdasaryan
2019-04-11T16:54:24Z

On Thu, Apr 11, 2019 at 5:16 AM Michal Hocko <mhocko@kernel.org> wrote:
>
> On Thu 11-04-19 07:51:21, Rik van Riel wrote:
> > On Wed, 2019-04-10 at 18:43 -0700, Suren Baghdasaryan via Lsf-pc wrote:
> > > The time to kill a process and free its memory can be critical when
> > > the
> > > killing was done to prevent memory shortages affecting system
> > > responsiveness.
> >
> > The OOM killer is fickle, and often takes a fairly
> > long time to trigger. Speeding up what happens after
> > that seems like the wrong thing to optimize.
> >
> > Have you considered using something like oomd to
> > proactively kill tasks when memory gets low, so
> > you do not have to wait for an OOM kill?
>
> AFAIU, this is the point here. They probably have a user space OOM
> killer implementation and want to achieve killing to be as swift as
> possible.

That is correct. Android has a userspace daemon called lmkd (low
memory killer daemon) to respond to memory pressure before things get
bad enough for kernel oom-killer to get involved. So this asynchronous
reclaim optimization would allow lmkd do its job more efficiently.

> --
> Michal Hocko
> SUSE Labs
>
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