Re: [PATCH v4 1/1] mm: vmscan: Reduce throttling due to a failure to make progress

Mel Gorman
2022-02-15T14:51:31Z

On Mon, Feb 14, 2022 at 04:10:50PM -0500, Shuang Zhai wrote:
> Hi Mel,
>
> Mel Gorman wrote:
> >
> > Mike Galbraith, Alexey Avramov and Darrick Wong all reported similar
> > problems due to reclaim throttling for excessive lengths of time.
> > In Alexey's case, a memory hog that should go OOM quickly stalls for
> > several minutes before stalling. In Mike and Darrick's cases, a small
> > memcg environment stalled excessively even though the system had enough
> > memory overall.
> >
>
> I recently found a regression when I tested MGLRU with fio on Linux
> 5.16-rc6 [1]. After this patch was applied, I re-ran the test with Linux
> 5.16, but the regression has not been fixed yet.
>

Am I correct in thinging that this only happens with MGLRU?

--
Mel Gorman
SUSE Labs