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 0F6F8C43331 for ; Wed, 25 Mar 2020 14:12:41 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id CDA2020722 for ; Wed, 25 Mar 2020 14:12:40 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1585145560; bh=sKqIZkqsdPcIsiaarERjYdbTn9cwigKL9KvUAbZIfCY=; h=Date:From:To:Cc:Subject:References:In-Reply-To:List-ID:From; b=OX3R9NypJarVko30eLytHLK/pRIMNKb7xyLXNtrAJPcyHUcmWpy8i/Pmn7X/zvQEk lEnQ+32RUa3WsVpELiXWGlBUNmVkW2jUGj+zf2yYTw8HastbHFExkaBdxdxMks6trV 09ZsepmuSEbc4SHEOYNpW8APvZVh2KF6F8axH+ew= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727601AbgCYOMk (ORCPT ); Wed, 25 Mar 2020 10:12:40 -0400 Received: from mail-qt1-f193.google.com ([209.85.160.193]:35865 "EHLO mail-qt1-f193.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1727521AbgCYOMk (ORCPT ); Wed, 25 Mar 2020 10:12:40 -0400 Received: by mail-qt1-f193.google.com with SMTP id m33so2231269qtb.3; Wed, 25 Mar 2020 07:12:39 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=sender:date:from:to:cc:subject:message-id:references:mime-version :content-disposition:in-reply-to; bh=N7nQ4ebz3lUmPEZItWMKhCh2iPFhfdeLlfUD+yoZmZE=; b=FXRWZ4idTS/9SmW/h6ukMHo4O1sk+A7oUGDB5LsZQ8TKlldyn0o8yk88kVp2+kcSJC lvfqLWPwknKK0boCQXOXvGH17M9KbmCpw+qMPU/AXfi4lJQSylRdzjjv1OKBrKM03K3L 8LGV2prz6EVm47zu9u+8bJ7y/P8CJulaulx5BkB7mfTRcwa0cGi4R1/7u49roDrt2BU/ VdLxEKJhSbSnALe6Vr1yEJRTQLxGWRICUVQOOfkQLA5ahpQka7smhjhAmLiB+I70lyZV Fob0h/ZhNg+DZx+y0rC801gEIeQArWhhCPUrPRd5QTlXXyfMhQYoi+AByvtSvPuVBd0B 7eOA== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:sender:date:from:to:cc:subject:message-id :references:mime-version:content-disposition:in-reply-to; bh=N7nQ4ebz3lUmPEZItWMKhCh2iPFhfdeLlfUD+yoZmZE=; b=Khpea25LXugMQf7iWs582/WM4q5DtDxRakM4rlNY4DNC9pLtzRCmeNyWwY9Rwbbvax c2ylOra5M5Yws7qVu6ZUm3cyMXQubmZfZUBgdr+LyiIVBas5i87lOcBBSabyLMChAcIO zkw/J/31dCs5NgnhstGgLKPu2IgZuYCPu6f3oMPpOwylfjGeSzd2yXtiDDV0bQobQzxJ sPLUUSCGC1+BJxWGxKxjb4dzXt4+3NCGOjLdUpWVo7AX1E533UpXV9UszEFNhKNMWboa SUHgT6T+67Ci1lG8xHkQ02ktROXkoHw+DGd7BvIvrCI7x/r8RvgjhjdH48hQ3SlDDSKH 4fTw== X-Gm-Message-State: ANhLgQ1X8A9iHGbCGPkQ6rWCJv09aDT2swyi0KkUa7RFlnuesiMy9aT3 pxx1tX7qT3SVpB0p4rclfz29BLKOFd0= X-Google-Smtp-Source: ADFU+vviwj5kbNzPI4MpcV6D+abNsFlE2SyiEgoJJw/slckG95vaO1pSwoQcUzPy2GwpsjzhItDUEw== X-Received: by 2002:ac8:2911:: with SMTP id y17mr3065339qty.73.1585145558617; Wed, 25 Mar 2020 07:12:38 -0700 (PDT) Received: from localhost ([2620:10d:c091:480::d8d4]) by smtp.gmail.com with ESMTPSA id e130sm15532213qkb.72.2020.03.25.07.12.37 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 25 Mar 2020 07:12:37 -0700 (PDT) Date: Wed, 25 Mar 2020 10:12:36 -0400 From: Tejun Heo To: Weiping Zhang Cc: Jens Axboe , linux-block@vger.kernel.org, cgroups@vger.kernel.org Subject: Re: [RFC 0/3] blkcg: add blk-iotrack Message-ID: <20200325141236.GJ162390@mtj.duckdns.org> References: <20200324182725.GG162390@mtj.duckdns.org> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: Sender: linux-block-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-block@vger.kernel.org On Wed, Mar 25, 2020 at 08:49:24PM +0800, Weiping Zhang wrote: > For this patchset, iotrack can work well, I'm using it to monitor > block cgroup for > selecting a proper io isolation policy. Yeah, I get that but monitoring needs tend to diverge quite a bit depending on the use cases making detailed monitoring often need fair bit of flexibility, so I'm a bit skeptical about adding a fixed controller for that. I think a better approach may be implementing features which can make dynamic monitoring whether that's through bpf, drgn or plain tracepoints easier and more efficient. Thanks. -- tejun