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Date: Fri, 15 Dec 2023 12:22:51 -0800
From: Andrew Morton <akpm@linux-foundation.org>
To: Linus Torvalds <torvalds@linux-foundation.org>
Cc: linux-mm@kvack.org, linux-kernel@vger.kernel.org, Yu Zhao
 <yuzhao@google.com>
Subject: Re: [GIT PULL] hotfixes for 6.7-rc6
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On Fri, 15 Dec 2023 12:11:42 -0800 Linus Torvalds <torvalds@linux-foundation.org> wrote:

> On Fri, 15 Dec 2023 at 07:16, Andrew Morton <akpm@linux-foundation.org> wrote:
> >
> > Yu Zhao (4):
> >       mm/mglru: fix underprotected page cache
> >       mm/mglru: try to stop at high watermarks
> >       mm/mglru: respect min_ttl_ms with memcgs
> >       mm/mglru: reclaim offlined memcgs harder
> 
> Entirely unrelated to this pull request (which I already pulled and
> pushed out, as noted by pr-tracker-bot), since I looked at these it
> just reminded me about a question I've had for a while...
> 
> Do we have any long-term (or even short-term?) plans to just make
> mglru be the one and only model?

I hope so, but I haven't heard specific plans.

Things are still stabilizing, but it seems we're a fair way down that
exponential curve.

> Yes, right now it's not just a Kconfig choice, but a real technical
> issue too: it depends on having enough flags available, so we have
> that "cannot use it on 32-bit with sparsemem".
> 
> But I'm hoping there is a plan or a workaround for that?

Hopefully Yu can talk to that.

> Because I feel like we really don't want to keep this "two different
> models" situation around forever.
> 

Sure.  Some diehards are still using slab :(