Received: by 10.223.164.202 with SMTP id h10csp706841wrb; Thu, 23 Nov 2017 05:04:56 -0800 (PST) X-Google-Smtp-Source: AGs4zMa5CAqVIdl5SvwuQnNv269P7tEHBIJ1GzYEiW+NBgiUVIZYDCm7UiRhTCQK/SCteJ9SMv4l X-Received: by 10.98.63.221 with SMTP id z90mr23199475pfj.101.1511442295898; Thu, 23 Nov 2017 05:04:55 -0800 (PST) ARC-Seal: i=1; a=rsa-sha256; t=1511442295; cv=none; d=google.com; s=arc-20160816; b=NqbiCkabUoHnOkVJuKt9YRlRNYUcUzaVk1+Kg7+fvTm+myIGT6+bECvf2YikRUEWbU VQXY4RPBxiSQqGaPZpDWAexLHDrKQw1E+D73dK0CNJkpWaFZZHeFqFAcQIgnieAQBvOr Sl7PIYAi1P3khtK6Hg2bAHx4vxnmmJVmBG2nq/WBg3EzYaQUU8hwql94YJJK2cZsM45G EjIkMn6qMywa6W7lqZb2Tjc2/2o8wRgAoiCoz1mLfZQPwG8A7OByFhgAMmbnReqdZ6zj J2wbHp9Er914dHiLhazG1Wcl/OGUmoujNsqnYLaJAz9l1O13M3YfNgqfWD8aKWbnUifw k88w== ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=arc-20160816; h=list-id:precedence:sender:content-language :content-transfer-encoding:in-reply-to:mime-version:user-agent:date :message-id:from:references:cc:to:subject:arc-authentication-results; bh=f746dhaB9DI22PPLQbTqFTNLqLUbMNDYYFHyQJ2XxIo=; b=XjcqLyAcp1qLlsUN5ysGnjB8O9iy9g8wFYYk/l/6g2X22U+mtV2qWPJGIfZEI9nBWG CH/8DYeGWRNSN/8EQTt6aVrsKsIW4/LjgkiGA6h2pmUVWVlqzJs/PgWIVQLXa2QydyIW KjVWFT8tct0riH5Wg6554o8oygr9HZ+zszl6o+58rRYKXC+/aLRUALtTwFqm2MPDNGgx Hgg/7ILZ1+ot1xy/MV2rjy+1gLAkTAe2Hmj0QbkmPr7w7DOD9fS4coZu6hT03tJU4g9+ KpMttrffObE5oFKmuLKxHYTY1a5kRD7nxx2S+cNWDP4z582YXrmD4BKAMKjKkXg7nZDy t9eg== ARC-Authentication-Results: i=1; mx.google.com; spf=pass (google.com: best guess record for domain of linux-kernel-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org Return-Path: Received: from vger.kernel.org (vger.kernel.org. [209.132.180.67]) by mx.google.com with ESMTP id f4si15769519plr.1.2017.11.23.05.04.44; Thu, 23 Nov 2017 05:04:55 -0800 (PST) Received-SPF: pass (google.com: best guess record for domain of linux-kernel-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) client-ip=209.132.180.67; Authentication-Results: mx.google.com; spf=pass (google.com: best guess record for domain of linux-kernel-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753021AbdKWNDV convert rfc822-to-8bit (ORCPT + 75 others); Thu, 23 Nov 2017 08:03:21 -0500 Received: from seldsegrel01.sonyericsson.com ([37.139.156.29]:4599 "EHLO SELDSEGREL01.sonyericsson.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752977AbdKWNDG (ORCPT ); Thu, 23 Nov 2017 08:03:06 -0500 Subject: Re: [PATCH] Add slowpath enter/exit trace events To: Michal Hocko CC: , , Steven Rostedt , Ingo Molnar , Alex Deucher , "David S . Miller" , Harry Wentland , Greg Kroah-Hartman , Tony Cheng , Andrew Morton , Vlastimil Babka , Mel Gorman , Johannes Weiner , Pavel Tatashin References: <20171123104336.25855-1-peter.enderborg@sony.com> <20171123122530.ktsxgeakebfp3yep@dhcp22.suse.cz> <20171123124738.nj7foesbajo42t3g@dhcp22.suse.cz> From: peter enderborg Message-ID: Date: Thu, 23 Nov 2017 14:03:04 +0100 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:52.0) Gecko/20100101 Thunderbird/52.4.0 MIME-Version: 1.0 In-Reply-To: <20171123124738.nj7foesbajo42t3g@dhcp22.suse.cz> Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 8BIT Content-Language: en-GB Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On 11/23/2017 01:47 PM, Michal Hocko wrote: > > This might be true but the other POV is that the trace point with the > additional information is just too disruptive to the rest of the code > and it exposes too many implementation details. >From who do you want to hide details? Is this a security thing? I don't understand this  argument.  Tracefs is not part of uapi, right? Hopefully there are not that many fails, and they might be very hard to reproduce if you don't know what you are looking for. From 1584861867396341801@xxx Thu Nov 23 13:00:57 +0000 2017 X-GM-THRID: 1584853363124088746 X-Gmail-Labels: Inbox,Category Forums,HistoricalUnread