Re: [PATCH] mm: vmscan: fix extreme overreclaim and swap floods

[Johannes Weiner]

On Tue, Aug 02, 2022 at 05:06:19PM -0700, Andrew Morton wrote:
> On Tue,  2 Aug 2022 12:28:11 -0400 Johannes Weiner <hannes@xxxxxxxxxxx> wrote:
> 
> > Change the code such that only one SWAP_CLUSTER_MAX-sized nudge toward
> > the larger LRU lists is made before bailing out on a met reclaim goal.
> 
> It seems rash to jam this into 5.20-rc1 at this stage.  I'm thinking
> 5.21-rc1 with a cc:stable?

Yeah, 5.20-rc1 sounds fast. Let's wait for reviews first and see how
much confidence we get on that change. I can't help but feel, reading
logs and comments (commit 1a501907bbea8e6ebb0b16cf6db9e9cbf1d2c813),
that my fix is how the code was intended to work from the start.

5.21 does sound a biiiit on the long side for fixing such extreme
misbehavior, IMO, once it's proven to affect production workloads in
the wild. I was hoping -rc2 or so...