From: "Lorenzo Stoakes (Oracle)" <ljs@kernel.org>
To: Kairui Song <ryncsn@gmail.com>
Cc: Andrew Morton <akpm@linux-foundation.org>,
Shakeel Butt <shakeel.butt@linux.dev>,
lsf-pc@lists.linux-foundation.org,
Johannes Weiner <hannes@cmpxchg.org>,
David Hildenbrand <david@kernel.org>,
Michal Hocko <mhocko@kernel.org>,
Qi Zheng <zhengqi.arch@bytedance.com>,
Chen Ridong <chenridong@huaweicloud.com>,
Emil Tsalapatis <emil@etsalapatis.com>,
Alexei Starovoitov <ast@kernel.org>,
Axel Rasmussen <axelrasmussen@google.com>,
Yuanchu Xie <yuanchu@google.com>, Wei Xu <weixugc@google.com>,
Matthew Wilcox <willy@infradead.org>,
Nhat Pham <nphamcs@gmail.com>, Gregory Price <gourry@gourry.net>,
Barry Song <21cnbao@gmail.com>,
David Stevens <stevensd@google.com>,
Vernon Yang <vernon2gm@gmail.com>,
David Rientjes <rientjes@google.com>,
Kalesh Singh <kaleshsingh@google.com>,
wangzicheng <wangzicheng@honor.com>,
"T . J . Mercier" <tjmercier@google.com>,
Baolin Wang <baolin.wang@linux.alibaba.com>,
Suren Baghdasaryan <surenb@google.com>,
Meta kernel team <kernel-team@meta.com>,
bpf@vger.kernel.org, linux-mm@kvack.org,
linux-kernel@vger.kernel.org
Subject: Re: [LSF/MM/BPF TOPIC] Towards Unified and Extensible Memory Reclaim (reclaim_ext)
Date: Thu, 26 Mar 2026 12:31:25 +0000 [thread overview]
Message-ID: <f617acf0-6bb6-4ea0-85c2-d6f377a2a574@lucifer.local> (raw)
In-Reply-To: <CAMgjq7A01C+wyHxytZfVFVvaJ+gUNqkKvYN61_Peo911YaBHOw@mail.gmail.com>
+cc Gregory
On Thu, Mar 26, 2026 at 08:06:13PM +0800, Kairui Song wrote:
> On Thu, Mar 26, 2026 at 10:05 AM Andrew Morton
> <akpm@linux-foundation.org> wrote:
> >
> > On Wed, 25 Mar 2026 14:06:37 -0700 Shakeel Butt <shakeel.butt@linux.dev> wrote:
> >
> > > We should unify both algorithms into a single code path.
> >
> > I'm here to ask the questions which others fear will sound dumb.
> >
> > Is it indeed the plan to maintain both implementations? I thought the
> > long-term ambition was to knock MGLRU into shape and to drop the legacy LRU?
>
> I personally also agree on that, so far I'm not aware of any major
> issues with MGLRU except some corner cases that are not hard to fix.
> Once these are done, I don't see the need for more complexity.
Well... :)
What about the issues Gregory raised here?
https://lore.kernel.org/linux-mm/aaXM7xNSJaJBsety@gourry-fedora-PF4VCD3F/
>
>
> > And that Linus has expressed such a desire, but my googling fails me.
Yup I know, and it'd be ideal to have a single approach, but we definitely need
a little more assurance this time that it's the right choice :)
In any case I do agree with Shakeel that de-duplicating the code and 'stealing'
good ideas from it for both flavours of reclaim at least to start with is a good
way forwards.
Once we've done that, we can work towards eliminating the 'classic' reclaim if
the data supports it.
Thanks, Lorenzo
next prev parent reply other threads:[~2026-03-26 12:31 UTC|newest]
Thread overview: 29+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-03-25 21:06 [LSF/MM/BPF TOPIC] Towards Unified and Extensible Memory Reclaim (reclaim_ext) Shakeel Butt
2026-03-26 0:10 ` T.J. Mercier
2026-03-26 2:05 ` Andrew Morton
2026-03-26 7:03 ` Michal Hocko
2026-03-26 8:02 ` Lorenzo Stoakes (Oracle)
2026-03-26 12:37 ` Kairui Song
2026-03-26 13:13 ` Lorenzo Stoakes (Oracle)
2026-03-26 13:42 ` David Hildenbrand (Arm)
2026-03-26 13:45 ` Lorenzo Stoakes (Oracle)
2026-03-26 16:02 ` Lorenzo Stoakes (Oracle)
2026-03-26 20:02 ` Axel Rasmussen
2026-03-26 20:30 ` Gregory Price
2026-03-26 20:47 ` Axel Rasmussen
2026-03-26 12:06 ` Kairui Song
2026-03-26 12:31 ` Lorenzo Stoakes (Oracle) [this message]
2026-03-26 13:17 ` Kairui Song
2026-03-26 13:26 ` Lorenzo Stoakes (Oracle)
2026-03-26 13:21 ` Shakeel Butt
2026-03-26 7:12 ` Michal Hocko
2026-03-26 13:44 ` Shakeel Butt
2026-03-26 15:24 ` Michal Hocko
2026-03-26 18:21 ` Shakeel Butt
2026-03-26 7:18 ` wangzicheng
2026-03-26 11:43 ` Lorenzo Stoakes (Oracle)
2026-03-26 15:24 ` Gregory Price
2026-03-26 15:35 ` Lorenzo Stoakes (Oracle)
2026-03-26 16:32 ` Gregory Price
2026-03-26 16:40 ` Lorenzo Stoakes (Oracle)
2026-03-26 18:49 ` Shakeel Butt
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