Received: by 2002:ac0:bc90:0:0:0:0:0 with SMTP id a16csp653622img; Thu, 21 Mar 2019 06:17:49 -0700 (PDT) X-Google-Smtp-Source: APXvYqyWx//y/OqxBshED35c5Hejli+0BMGzMgzZbOnF1mbG+6xR0lTWbbmANKvmVco0fZDqEDny X-Received: by 2002:a65:49c4:: with SMTP id t4mr3276186pgs.421.1553174269098; Thu, 21 Mar 2019 06:17:49 -0700 (PDT) ARC-Seal: i=1; a=rsa-sha256; t=1553174269; cv=none; d=google.com; s=arc-20160816; b=aQOMCD0zebzpHVhRCEIRY8c16r17SyAHBdLlMOFDzZzHL1+Q0CONBmGSxI+KjzqF6d D19QDwhzBaqwvp+QO89qfZJJEq1Knv/2/AJsPt8P447K0U/gtjtuTgmjyHJnsCmZcW4h ilhzghER+SY/oIiKgnwD8ogu/VFCKbFvPs7anPsTI9N32W2CMH9U/RTwgT9qR5icdpCP sLPkShL3f2abuxHvi0qKNbvhaNL4lmu4x6C7FJaOgPjZhj1oHIiON9qR6qdsc9wK5sp6 Pfys5ewhPSAC5/1B48wlJ/NiyNgrfeCtZyxdFDwH/v3aQBS2V/C0NlxIHLQU8FZcRQ0R QuFQ== ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=arc-20160816; h=list-id:precedence:sender:content-transfer-encoding:mime-version :references:in-reply-to:message-id:subject:cc:to:from:date; bh=hruqM4AlVWb1AJj6VccKDMCytVrhXY6BHApIBf2kBt8=; b=GXQ7tIugVTJmwht5dIMKm45bstSLxrrle+wKeGYqq+i94M9YJIqbsHiH9Rn+fOPosl 6MUxJ/s5g/EQWTFKlBZP+5i93j/uic/uPxp7WH2Vhi+c1rtRyQ6z/VUOArP8XRyMCRhH NHUWSBcD86CObJQ6Maf2hhhUKkwSVw79wccYsyiOZRgnUXFEiak2yCBIS6/x9wEAc/Wz hCIhhvIqCXcRvemRNOtAnZ46K7js9SebE3HHE6WGUCrIkAIJGuvbMPuKLQCFFhn8QPgS ePvBNERysLwUuuofY5o7eDt0rgS8EMnw0iBa/owrwsPZUM5i8vhNn3XeXNDB3q1mKwRH srTQ== 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 p70si4210938pfa.9.2019.03.21.06.17.19; Thu, 21 Mar 2019 06:17:49 -0700 (PDT) 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 S1728231AbfCUNOA (ORCPT + 99 others); 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