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 X-Spam-Level: X-Spam-Status: No, score=-1.1 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS autolearn=no autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id D56BCC433E0 for ; Fri, 3 Jul 2020 06:35:53 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 9CAA2208B8 for ; Fri, 3 Jul 2020 06:35:53 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1593758153; bh=3FsWszTQnm5YA3ZC88qLArdStmQVeYcGNho75Qvq2XM=; h=Date:From:To:Cc:Subject:References:In-Reply-To:List-ID:From; b=DMlL8s5bgmlfRt8MQ7EBtJCR3GmBMQ9cNIW6+jK4hvpsT6Jw1LYrnUzV5kiqbhU54 v0FNC+TWYoqLkAqPjvEFZQeC49ePGuBe1YE6AhDhmOV+x5d1WYxRGE+NSXUuzPYUWc SCuEL+6BvApedKx0677q370mOKVwZWKYSyJLGDXU= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726288AbgGCGfw (ORCPT ); Fri, 3 Jul 2020 02:35:52 -0400 Received: from mail-ej1-f47.google.com ([209.85.218.47]:39578 "EHLO mail-ej1-f47.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1725764AbgGCGfw (ORCPT ); Fri, 3 Jul 2020 02:35:52 -0400 Received: by mail-ej1-f47.google.com with SMTP id w6so33016532ejq.6; Thu, 02 Jul 2020 23:35:50 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:date:from:to:cc:subject:message-id:references :mime-version:content-disposition:in-reply-to; bh=NojDtPHgyU04BZgerYd3+yccFVPzYnZ7F9ygI7w4DNc=; b=VtRda+Ecd2HlpxEH1hLDOocC4PXPYGM0mm9nskZDOVQ8+TJ20ky9Z68YXdPeZwtvqX b4sQO1NCOPaMUqrXGL+Xk//ZEupQsBXOy7SmFYhQ/XsghIvTsz9c4E8hI0WpS1AfawbT gYKqJwgb5OiVchrOm1YljNi9ThiF+WX7v3+lEbjuMvcsr6OGATr6ElFRGMwXw/uNOiT0 YeCF+1gYXok1pwtz3T+SzsmsevqQWQz+jSvqQlW8VkF09EZDOm0k7q3Qekjjtv68vR1X nZKKP8XEfRkNlcUwS0flOhPEcqoW9cavpOBlv51yTeZmuvIlANeJd97RnBhmGkuB8Wh1 GMmg== X-Gm-Message-State: AOAM533h11ikhUboI0iUz4OWKWmQ7jKzNkyrypgwedQ6XUWDBR2pxouy ajY2VcozHvKEVaCc+SSokBw= X-Google-Smtp-Source: ABdhPJwihp/EUddRgogAcW9jNPLdXKXMVfUNhqWuG6Q0n58p0Pz12bOw5FOZ3ev6WXaFzNeayEZexQ== X-Received: by 2002:a17:906:71d4:: with SMTP id i20mr32649859ejk.533.1593758150250; Thu, 02 Jul 2020 23:35:50 -0700 (PDT) Received: from localhost (ip-37-188-168-3.eurotel.cz. [37.188.168.3]) by smtp.gmail.com with ESMTPSA id b11sm11620695edw.76.2020.07.02.23.35.48 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 02 Jul 2020 23:35:49 -0700 (PDT) Date: Fri, 3 Jul 2020 08:35:48 +0200 From: Michal Hocko To: Shakeel Butt Cc: Johannes Weiner , Roman Gushchin , Yang Shi , David Rientjes , Greg Thelen , Andrew Morton , linux-mm@kvack.org, linux-kernel@vger.kernel.org, cgroups@vger.kernel.org Subject: Re: [RFC PROPOSAL] memcg: per-memcg user space reclaim interface Message-ID: <20200703063548.GM18446@dhcp22.suse.cz> References: <20200702152222.2630760-1-shakeelb@google.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20200702152222.2630760-1-shakeelb@google.com> Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Thu 02-07-20 08:22:22, Shakeel Butt wrote: [...] > Interface options: > ------------------ > > 1) memcg interface e.g. 'echo 10M > memory.reclaim' > > + simple > + can be extended to target specific type of memory (anon, file, kmem). > - most probably restricted to cgroup v2. > > 2) fadvise(PAGEOUT) on cgroup_dir_fd > > + more general and applicable to other FSes (actually we are using > something similar for tmpfs). > + can be extended in future to just age the LRUs instead of reclaim or > some new use cases. Could you explain why memory.high as an interface to trigger pro-active memory reclaim is not sufficient. Also memory.low limit to protect latency sensitve workloads? -- Michal Hocko SUSE Labs