From patchwork Tue Nov 8 18:17:33 2016 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Stefan Hajnoczi X-Patchwork-Id: 81365 Delivered-To: patch@linaro.org Received: by 10.140.97.165 with SMTP id m34csp1685356qge; Tue, 8 Nov 2016 10:20:32 -0800 (PST) X-Received: by 10.157.24.41 with SMTP id b38mr6649102ote.117.1478629232008; Tue, 08 Nov 2016 10:20:32 -0800 (PST) Return-Path: Received: from lists.gnu.org (lists.gnu.org. [2001:4830:134:3::11]) by mx.google.com with ESMTPS id x65si19743645oig.183.2016.11.08.10.20.31 for (version=TLS1 cipher=AES128-SHA bits=128/128); Tue, 08 Nov 2016 10:20:32 -0800 (PST) Received-SPF: pass (google.com: domain of qemu-devel-bounces+patch=linaro.org@nongnu.org designates 2001:4830:134:3::11 as permitted sender) client-ip=2001:4830:134:3::11; Authentication-Results: mx.google.com; spf=pass (google.com: domain of qemu-devel-bounces+patch=linaro.org@nongnu.org designates 2001:4830:134:3::11 as permitted sender) smtp.mailfrom=qemu-devel-bounces+patch=linaro.org@nongnu.org Received: from localhost ([::1]:34768 helo=lists.gnu.org) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1c4B0Z-000270-Bc for patch@linaro.org; Tue, 08 Nov 2016 13:20:31 -0500 Received: from eggs.gnu.org ([2001:4830:134:3::10]:39289) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1c4Axo-0000z6-QL for qemu-devel@nongnu.org; Tue, 08 Nov 2016 13:17:41 -0500 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1c4Axl-0001rt-T2 for qemu-devel@nongnu.org; Tue, 08 Nov 2016 13:17:40 -0500 Received: from mx1.redhat.com ([209.132.183.28]:54182) by eggs.gnu.org with esmtps (TLS1.0:DHE_RSA_AES_256_CBC_SHA1:32) (Exim 4.71) (envelope-from ) id 1c4Axl-0001ro-Ng for qemu-devel@nongnu.org; Tue, 08 Nov 2016 13:17:37 -0500 Received: from int-mx09.intmail.prod.int.phx2.redhat.com (int-mx09.intmail.prod.int.phx2.redhat.com [10.5.11.22]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mx1.redhat.com (Postfix) with ESMTPS id 06C5C883B1; Tue, 8 Nov 2016 18:17:37 +0000 (UTC) Received: from localhost (ovpn-112-59.ams2.redhat.com [10.36.112.59]) by int-mx09.intmail.prod.int.phx2.redhat.com (8.14.4/8.14.4) with ESMTP id uA8IHZ1h030939; Tue, 8 Nov 2016 13:17:36 -0500 From: Stefan Hajnoczi To: Date: Tue, 8 Nov 2016 18:17:33 +0000 Message-Id: <1478629053-31709-2-git-send-email-stefanha@redhat.com> In-Reply-To: <1478629053-31709-1-git-send-email-stefanha@redhat.com> References: <1478629053-31709-1-git-send-email-stefanha@redhat.com> X-Scanned-By: MIMEDefang 2.68 on 10.5.11.22 X-Greylist: Sender IP whitelisted, not delayed by milter-greylist-4.5.16 (mx1.redhat.com [10.5.110.26]); Tue, 08 Nov 2016 18:17:37 +0000 (UTC) X-detected-operating-system: by eggs.gnu.org: GNU/Linux 2.2.x-3.x [generic] X-Received-From: 209.132.183.28 Subject: [Qemu-devel] [PULL 1/1] docs/tracing.txt: Update documentation of default backend X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.21 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Peter Maydell , Stefan Hajnoczi Errors-To: qemu-devel-bounces+patch=linaro.org@nongnu.org Sender: "Qemu-devel" From: Peter Maydell In commit baf86d6b3c we switched the default trace backend from "nop" to "log". Update the documentation to match. Signed-off-by: Peter Maydell Message-id: 1478276837-31780-1-git-send-email-peter.maydell@linaro.org Signed-off-by: Stefan Hajnoczi --- docs/tracing.txt | 7 +++++-- 1 file changed, 5 insertions(+), 2 deletions(-) -- 2.7.4 diff --git a/docs/tracing.txt b/docs/tracing.txt index e62444c..f351998a 100644 --- a/docs/tracing.txt +++ b/docs/tracing.txt @@ -150,13 +150,16 @@ The trace backends are chosen at configure time: For a list of supported trace backends, try ./configure --help or see below. If multiple backends are enabled, the trace is sent to them all. +If no backends are explicitly selected, configure will default to the +"log" backend. + The following subsections describe the supported trace backends. === Nop === The "nop" backend generates empty trace event functions so that the compiler -can optimize out trace events completely. This is the default and imposes no -performance penalty. +can optimize out trace events completely. This imposes no performance +penalty. Note that regardless of the selected trace backend, events with the "disable" property will be generated with the "nop" backend.