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Wed, 15 Jul 2026 07:00:48 -0700 (PDT) Date: Wed, 15 Jul 2026 16:00:46 +0200 From: Johannes Weiner To: Zicheng Wang Cc: akpm@linux-foundation.org, yuanchu@google.com, tj@kernel.org, mkoutny@suse.com, corbet@lwn.net, kasong@tencent.com, qi.zheng@linux.dev, shakeel.butt@linux.dev, baohua@kernel.org, axelrasmussen@google.com, weixugc@google.com, david@kernel.org, ljs@kernel.org, liam@infradead.org, vbabka@kernel.org, rppt@kernel.org, surenb@google.com, mhocko@suse.com, roman.gushchin@linux.dev, muchun.song@linux.dev, cgroups@vger.kernel.org, linux-mm@kvack.org, linux-kernel@vger.kernel.org, linux-doc@vger.kernel.org, willy@infradead.org, denghaojie@honor.com, baoquan.he@linux.dev, kaleshsingh@google.com, tjmercier@google.com, tao.wangtao@honor.com, zhangji1@honor.com, wangzhen5@honor.com Subject: Re: [RFC v2 0/3] mm/mglru: proactive aging via memory.aging Message-ID: <20260715140046.GO276793@cmpxchg.org> References: <20260714121529.2237261-1-wangzicheng@honor.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20260714121529.2237261-1-wangzicheng@honor.com> On Tue, Jul 14, 2026 at 08:15:26PM +0800, Zicheng Wang wrote: > MGLRU inverts the reclaim order when anonymous memory is faulted in > bulk: anonymous pages sit in the young generations while file pages > sit in the oldest two, so reclaim evicts hot file pages before cold > anonymous pages. An aging inversion in the reclaim algorithm seems like an exceedingly poor justification for a userspace interface to work around them.