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 vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 28455C433EF for ; Fri, 18 Feb 2022 18:56:51 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S235885AbiBRS5E (ORCPT ); Fri, 18 Feb 2022 13:57:04 -0500 Received: from mxb-00190b01.gslb.pphosted.com ([23.128.96.19]:51066 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S235716AbiBRS5D (ORCPT ); Fri, 18 Feb 2022 13:57:03 -0500 Received: from mail-pf1-x42c.google.com (mail-pf1-x42c.google.com [IPv6:2607:f8b0:4864:20::42c]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 1C0F420F60 for ; Fri, 18 Feb 2022 10:56:46 -0800 (PST) Received: by mail-pf1-x42c.google.com with SMTP id y5so3021809pfe.4 for ; Fri, 18 Feb 2022 10:56:46 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20210112; h=date:from:to:cc:subject:in-reply-to:message-id:references :mime-version; bh=dbe5PmbOzu407KEsPvcN8zvRJM1P0pbKwetHq/iEzos=; b=lFy1wh6Fs5vAcbQolk5/ZuS0j8ngCp9l1Ec5UjYZCnmRC8oPrhCexnNr3sqTmnpC9I ar+eBAwyb3BGhb+qlCicc7nB6hWxdPwpNTFDQ/Y/TaQ+C1Wx7XCv6esI7uC/XQWIsCQl dB7j43NJaM0uQu3fNB5gj84GqiWGt/vXA1VCj7CmPwf95ZKiCsxgZ+0U/ktem0WBpHs4 Vdz/ZOxBCAiSahiBaoqYgZzfKrhsemQoRdK9LvWCveUyt7xsxkJ4nm+Lv5jP4lEQneb0 uN2nEkRPzhhXlNhlD9haNEYnSshl37Q9+W/L+7aCBzTtBPj4a+uzT1NNMsR8dhMXu7aH V9Xg== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=x-gm-message-state:date:from:to:cc:subject:in-reply-to:message-id :references:mime-version; bh=dbe5PmbOzu407KEsPvcN8zvRJM1P0pbKwetHq/iEzos=; b=6J997vsyz/9hMYPeOyZIH5xoqsR2h6zNoLs8PnXlUvBAFSfUjQacP/IC6cXny+EwzR wrxQbA67gZwRkHZBj3oEB/xyRmBhBn8AroS+n/Npnsa9lU7H4YAED6s0xcKdoDzEcGw5 SI1NLAA2cnd6rDK0PMWRMgtBk3VH10c9IO7FOAJgokcZQGrt0B4Iv+ENL3NfKdUmIn3D L8jmEvFAXkhzSV5c+eYfzXixF6BSBhUI7bKMEep30aEMdhG/2+gRyqiyRdlCfD9RewWQ bfWYtRsfnt3ZECO1yfDmw+1Ucpu6IO7sxhIki0AjoLBujXDdu4Ga0ezKVJZK/SV2taTJ plBg== X-Gm-Message-State: AOAM530Kb4po3hq7f62WOypUufQE6nOOjKOQMlpOqou9JhIdQzrWs9VR r7gk0h4WURbyTajFxLe/EqhT7g== X-Google-Smtp-Source: ABdhPJwSjj6GxMmzYDQ5iCyFOqCMP2mgbA8qtwDhJa3dj1eG4LQCuQFN/eBzULYMlQIQK1xbNs9SOQ== X-Received: by 2002:a63:ff54:0:b0:373:520f:a01d with SMTP id s20-20020a63ff54000000b00373520fa01dmr7313446pgk.394.1645210605382; Fri, 18 Feb 2022 10:56:45 -0800 (PST) Received: from [2620:15c:29:204:701:472c:4005:6710] ([2620:15c:29:204:701:472c:4005:6710]) by smtp.gmail.com with ESMTPSA id a17sm136665pju.15.2022.02.18.10.56.44 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 18 Feb 2022 10:56:44 -0800 (PST) Date: Fri, 18 Feb 2022 10:56:44 -0800 (PST) From: David Rientjes To: Yu Zhao , Johannes Weiner , Shakeel Butt cc: Andrew Morton , Johannes Weiner , Mel Gorman , Michal Hocko , Andi Kleen , Aneesh Kumar , Barry Song <21cnbao@gmail.com>, Catalin Marinas , Dave Hansen , Hillf Danton , Jens Axboe , Jesse Barnes , Jonathan Corbet , Linus Torvalds , Matthew Wilcox , Michael Larabel , Mike Rapoport , Rik van Riel , Vlastimil Babka , Will Deacon , Ying Huang , linux-arm-kernel@lists.infradead.org, linux-doc@vger.kernel.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org, page-reclaim@google.com, x86@kernel.org, Brian Geffon , Jan Alexander Steffens , Oleksandr Natalenko , Steven Barrett , Suleiman Souhlal , Daniel Byrne , Donald Carr , =?UTF-8?Q?Holger_Hoffst=C3=A4tte?= , Konstantin Kharlamov , Shuang Zhai , Sofia Trinh Subject: Re: [page-reclaim] [PATCH v7 11/12] mm: multigenerational LRU: debugfs interface In-Reply-To: <20220208081902.3550911-12-yuzhao@google.com> Message-ID: <5dcf93c7-7b75-507e-f896-d1bd8c7ceb37@google.com> References: <20220208081902.3550911-1-yuzhao@google.com> <20220208081902.3550911-12-yuzhao@google.com> MIME-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Precedence: bulk List-ID: X-Mailing-List: linux-doc@vger.kernel.org On Tue, 8 Feb 2022, Yu Zhao wrote: > Add /sys/kernel/debug/lru_gen for working set estimation and proactive > reclaim. These features are required to optimize job scheduling (bin > packing) in data centers [1][2]. > Johannes, do you believe this interface is sufficient to induce memcg based reclaim or do you have plans to propose a memory.reclaim extension to memcg? I assume that lru_gen could be used even if memcg is disabled whereas memory.reclaim would only be available on systems where the controller is mounted through cgroups. Yet a question would probably arise about the stability of this interface since it lives in debugfs: can we plan on /sys/kernel/debug/lru_gen being long-term supported?