From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from kanga.kvack.org (kanga.kvack.org [205.233.56.17]) (using TLSv1 with cipher DHE-RSA-AES256-SHA (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id 5A151C44501 for ; Thu, 16 Jul 2026 02:29:23 +0000 (UTC) Received: by kanga.kvack.org (Postfix) id 25BD66B008C; Wed, 15 Jul 2026 22:29:22 -0400 (EDT) Received: by kanga.kvack.org (Postfix, from userid 40) id 232F26B0092; Wed, 15 Jul 2026 22:29:22 -0400 (EDT) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id 14BBD6B0093; Wed, 15 Jul 2026 22:29:22 -0400 (EDT) X-Delivered-To: linux-mm@kvack.org Received: from relay.hostedemail.com (smtprelay0010.hostedemail.com [216.40.44.10]) by kanga.kvack.org (Postfix) with ESMTP id DE6F66B008C for ; Wed, 15 Jul 2026 22:29:21 -0400 (EDT) Received: from smtpin17.hostedemail.com (lb01a-stub [10.200.18.249]) by unirelay10.hostedemail.com (Postfix) with ESMTP id 64CE2C0354 for ; Thu, 16 Jul 2026 02:29:21 +0000 (UTC) X-FDA: 84993058122.17.21BB1FB Received: from out-172.mta0.migadu.com (out-172.mta0.migadu.com [91.218.175.172]) by imf08.hostedemail.com (Postfix) with ESMTP id 55CB8160003 for ; Thu, 16 Jul 2026 02:29:19 +0000 (UTC) Authentication-Results: imf08.hostedemail.com; dkim=pass header.d=linux.dev header.s=key1 header.b=rdhgnoOF; dmarc=pass (policy=none) header.from=linux.dev; spf=pass (imf08.hostedemail.com: domain of ridong.chen@linux.dev designates 91.218.175.172 as permitted sender) smtp.mailfrom=ridong.chen@linux.dev ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=hostedemail.com; s=arc-20220608; t=1784168959; h=from:from:sender:reply-to:subject:subject:date:date: message-id:message-id:to:to:cc:cc:mime-version:mime-version: content-type:content-type: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references:dkim-signature; bh=ahnMBpv0EUvokoPv1D+yV8tvyG49SF0lRDVbaeWeWVs=; b=0JQZB98BX3wxDl/6E+3K8FoMvOQ4zeHfymQ2SipyHIwSTgpbcGZTK/6O6xA2KsEtZRNeQG 3BZ78OgesYzS8RrikZhyPWob1vEQ3bmk3ZSDufx6GtEwPhqfmzN66AYXmHr4h204C8bXna D1HPAAu3Lp5umcJ+ERG7zj0yR40mW00= ARC-Authentication-Results: i=1; imf08.hostedemail.com; dkim=pass header.d=linux.dev header.s=key1 header.b=rdhgnoOF; dmarc=pass (policy=none) header.from=linux.dev; spf=pass (imf08.hostedemail.com: domain of ridong.chen@linux.dev designates 91.218.175.172 as permitted sender) smtp.mailfrom=ridong.chen@linux.dev ARC-Seal: i=1; a=rsa-sha256; d=hostedemail.com; s=arc-20220608; cv=none; t=1784168959; b=Kv03825M6vb6TcPybHZ3KCmX0PmXl6d8rHptNfGCbq5fiieQJF21vdAnAfXqPBrJ5LbaeB 0BfeVCqo0i3U/q4XPs7SaKcS+uCWMKHV9VcZIN+yb5yh9/IOnLG7lEekZ3apmDzvRIiE1X 7Mk5P71IHv7/UI7rbgAp3Q1DK+DK2rQ= Message-ID: DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linux.dev; s=key1; t=1784168956; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=ahnMBpv0EUvokoPv1D+yV8tvyG49SF0lRDVbaeWeWVs=; b=rdhgnoOFQ2JyOJedrMszmsV7Mi67qyVefKSeNc3lWKTFc7BzvHcnYtOXXripbmfmKojmrs GJUtvcy7tx5/ao03jBE38WEBH9y2TKUAOfObVKwOJjxDI1yrdAf1acx6LQ3rkQcGARhDmI N6wEFt9JzW3qSVST6xCRXxHEvI+EdsU= Date: Thu, 16 Jul 2026 10:29:02 +0800 MIME-Version: 1.0 Subject: Re: [RFC v2 0/3] mm/mglru: proactive aging via memory.aging To: "T.J. Mercier" , Zicheng Wang Cc: akpm@linux-foundation.org, yuanchu@google.com, tj@kernel.org, hannes@cmpxchg.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, tao.wangtao@honor.com, zhangji1@honor.com, wangzhen5@honor.com References: <20260714121529.2237261-1-wangzicheng@honor.com> X-Report-Abuse: Please report any abuse attempt to abuse@migadu.com and include these headers. From: Ridong Chen In-Reply-To: Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 8bit X-Migadu-Flow: FLOW_OUT X-Rspamd-Queue-Id: 55CB8160003 X-Stat-Signature: wjsihirf57rbc5gnrqy8af7qkkhaeiwj X-Rspam-User: X-Rspamd-Server: rspam12 X-HE-Tag: 1784168959-682505 X-HE-Meta: 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 m8BMaAHN /mpmHk7Mou/tQyPxG0BKWCBodkNeVP7SkaOFfooem7hXIDkpoH7W6NtDYLF+8NqfLXiLyLsLCCFOIcbSwiCxdkj8QNaiux3gSL0qd8TiDbQaZ9Mjw3lwqR5mWsN2yzW7bsyWnOVx7TVkW+qheYz6q/oU0eUC+C/5Bwr+l7xrN1QiSBKMD1abcxNnvQggRb4onaLFHyAb7MIhttR9P1QHXkjEDa0jhbchUuvamUtuFcMFrSAdyTuMtwKiNMaWWjnzbhxqOxgEOrdag/oBZ3aUS25eWFFBTh/b420cRNFLE1L1qIk6wJwsLcVe822yiJJ/jQDEo Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: On 7/16/2026 1:55 AM, T.J. Mercier wrote: > On Tue, Jul 14, 2026 at 5:15 AM Zicheng Wang wrote: >> The benefit is workload-dependent: file-cache-bound servers gain from >> aging, anon-bound servers do not, so no kernel default is correct for >> all. The kernel also cannot know when to age: on Android the right >> moment is the foreground-to-background transition, when the app's pages >> are cold but their PTE accessed bits are still accurate from foreground >> execution, a framework concept. > > When an app transitions and becomes cached, we attempt to reclaim its > entire workingset. We basically cat memory.current > memory.reclaim > and freeze the cgroup. > https://cs.android.com/android/platform/superproject/+/android-latest-release:system/core/libprocessgroup/task_profiles.cpp;drc=65bd7ab941a709bf049871406981022b988e1721;l=706 > > File / anon balance vs hotness and generational placement doesn't > matter in that scenario because we want to get rid of all of it. So I > don't really understand how you'd want to use an aging knob. > When the app becomes the foreground app again, reclaiming all of its background memcg memory may increase refault data, which may in turn slow down warm-launch performance. -- Best regards Ridong