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=-1.0 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, MAILING_LIST_MULTI,SPF_PASS,URIBL_BLOCKED autolearn=ham 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 A7256C43381 for ; Thu, 21 Mar 2019 13:14:01 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 7FB76205F4 for ; Thu, 21 Mar 2019 13:14:01 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1728247AbfCUNOA (ORCPT ); Thu, 21 Mar 2019 09:14:00 -0400 Received: from mail.kernel.org ([198.145.29.99]:42256 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1728102AbfCUNN7 (ORCPT ); Thu, 21 Mar 2019 09:13:59 -0400 Received: from gandalf.local.home (cpe-66-24-58-225.stny.res.rr.com [66.24.58.225]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id DA4E52083D; Thu, 21 Mar 2019 13:13:58 +0000 (UTC) Date: Thu, 21 Mar 2019 09:13:56 -0400 From: Steven Rostedt To: Joel Fernandes Cc: Mathieu Desnoyers , diamon-discuss@lists.linuxfoundation.org, lttng-dev , linux-kernel Subject: Re: [diamon-discuss] [RELEASE] LTTng-modules 2.9.11, 2.10.8, 2.11.0-rc2 (Linux kernel tracer) Message-ID: <20190321091356.38a6988d@gandalf.local.home> In-Reply-To: <20190321124122.GA30542@google.com> References: <60988959.4070.1541112982406.JavaMail.zimbra@efficios.com> <1199524058.2398.1553016874435.JavaMail.zimbra@efficios.com> <20190321124122.GA30542@google.com> X-Mailer: Claws Mail 3.16.0 (GTK+ 2.24.32; x86_64-pc-linux-gnu) MIME-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Thu, 21 Mar 2019 08:41:22 -0400 Joel Fernandes wrote: > Also does it also make sense for lttng ring buffer to use the ftrace code for > ring buffer, or make the ftrace ring buffer better and have lttng use it? Or > is the lttng ring buffer design too radically different? We tried in the past and never actually got something that we both could agree on. Now I believe the user space tools depend on the way each one is, so to change one will break the tools that read it. -- Steve From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Date: Thu, 21 Mar 2019 09:13:56 -0400 From: Steven Rostedt Message-ID: <20190321091356.38a6988d@gandalf.local.home> In-Reply-To: <20190321124122.GA30542@google.com> References: <60988959.4070.1541112982406.JavaMail.zimbra@efficios.com> <1199524058.2398.1553016874435.JavaMail.zimbra@efficios.com> <20190321124122.GA30542@google.com> MIME-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit Subject: Re: [diamon-discuss] [RELEASE] LTTng-modules 2.9.11, 2.10.8, 2.11.0-rc2 (Linux kernel tracer) List-Id: DiaMon diagnostic and monitoring workgroup general discussions List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , To: Joel Fernandes Cc: diamon-discuss@lists.linuxfoundation.org, lttng-dev , linux-kernel On Thu, 21 Mar 2019 08:41:22 -0400 Joel Fernandes wrote: > Also does it also make sense for lttng ring buffer to use the ftrace code for > ring buffer, or make the ftrace ring buffer better and have lttng use it? Or > is the lttng ring buffer design too radically different? We tried in the past and never actually got something that we both could agree on. Now I believe the user space tools depend on the way each one is, so to change one will break the tools that read it. -- Steve