From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from smtprelay.hostedemail.com (smtprelay0026.hostedemail.com [216.40.44.26]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by lists.ozlabs.org (Postfix) with ESMTPS id 3w764V0ZKyzDq7h for ; Wed, 19 Apr 2017 12:52:56 +1000 (AEST) Received: from smtprelay.hostedemail.com (10.5.19.251.rfc1918.com [10.5.19.251]) by smtpgrave03.hostedemail.com (Postfix) with ESMTP id AC65628ED2A for ; Wed, 19 Apr 2017 02:47:08 +0000 (UTC) Date: Tue, 18 Apr 2017 22:46:57 -0400 From: Steven Rostedt To: Frank Rowand Cc: Tyrel Datwyler , robh+dt@kernel.org, linuxppc-dev@lists.ozlabs.org, linux-kernel@vger.kernel.org, devicetree@vger.kernel.org, nfont@linux.vnet.ibm.com, mpe@ellerman.id.au, mingo@redhat.com Subject: Re: [PATCH] of: introduce event tracepoints for dynamic device_node lifecyle Message-ID: <20170418224657.1b7ed057@grimm.local.home> In-Reply-To: <58F6AA35.2040902@gmail.com> References: <1492475525-10827-1-git-send-email-tyreld@linux.vnet.ibm.com> <58F6AA35.2040902@gmail.com> MIME-Version: 1.0 Content-Type: text/plain; charset=US-ASCII List-Id: Linux on PowerPC Developers Mail List List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , On Tue, 18 Apr 2017 17:07:17 -0700 Frank Rowand wrote: > As far as I know, there is no easy way to combine trace data and printk() > style data to create a single chronology of events. If some of the > information needed to debug an issue is trace data and some is printk() > style data then it becomes more difficult to understand the overall > situation. You mean like: # echo 1 > /sys/kernel/debug/tracing/events/printk/console/enable Makes all printks also go into the ftrace ring buffer. -- Steve > > If Rob wants to convert printk() style data to trace data (and I can't > convince him otherwise) then I will have further comments on this specific > patch. >