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From: Shakeel Butt To: Baolin Wang Cc: Kairui Song , akpm@linux-foundation.org, hannes@cmpxchg.org, david@kernel.org, mhocko@kernel.org, zhengqi.arch@bytedance.com, axelrasmussen@google.com, yuanchu@google.com, weixugc@google.com, ljs@kernel.org, baohua@kernel.org, kasong@tencent.com, linux-mm@kvack.org, linux-kernel@vger.kernel.org, Jingxiang Zeng Subject: Re: [PATCH] mm: vmscan: fix dirty folios throttling on cgroup v1 for MGLRU Message-ID: References: <3445af0f09e8ca945492e052e82594f8c4f2e2f6.1774606060.git.baolin.wang@linux.alibaba.com> <0498d924-d76a-4d82-8767-e6297442967a@linux.alibaba.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <0498d924-d76a-4d82-8767-e6297442967a@linux.alibaba.com> X-Migadu-Flow: FLOW_OUT X-Rspamd-Queue-Id: 8410D20003 X-Stat-Signature: mt47an9fet6eti5pzz4wtrs6cbx1s88h X-Rspam-User: X-Rspamd-Server: rspam02 X-HE-Tag: 1775100240-615120 X-HE-Meta: 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 L9nKSqO5 D+/cnYR1sLW5uKWtGqGWap75+qmFWbWjgyKaORJ8UA24rdtxi3bRrUWPMp+zxZPgNO0ct0Q7ZbDGbxk/3Q02sPZbOZOPu78CkwvbCPqQ6O+tNmx7qT/U8YMJSBsib7UmJygkPt8WDDBrnWzRp1P+npzhXLve3NDVRx5oC0cHrOoqSknJj/zt/dGHfmmr8NJbYwT9/fQQ8RsF9O65Iz9Y+l3PLM7FGTbtEaph4xzF8wgEPC7s= Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: On Thu, Apr 02, 2026 at 10:51:37AM +0800, Baolin Wang wrote: > > [...] > > > > This is v1 only and I don't care much but what is stopping you from moving away > > > from v1? > > > > For example memsw? > > > > https://lore.kernel.org/linux-mm/q2x4drxpjbxcxgns6bjp446ynsxgl32ckcljqcol7posds4nit@3n3tjq35anvb/ > > > > I remember Jingxiang's plan is to improve the page counter first. > > Additionally, we still have some existing users on cgroup v1, and they will > need some time to migrate to cgroup v2. Time is fine but is there any specific v1 feature which is a blocker for you. The memsw is a known one and is the same for Google (data center). I am aiming to provide memsw like behavior through my memcg_ext proposal but performance is an open question. I am aiming to have a prototype before LSFMM to further the discussion.