From patchwork Fri Nov 4 16:27:17 2016 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Peter Maydell X-Patchwork-Id: 80877 Delivered-To: patches@linaro.org Received: by 10.80.170.210 with SMTP id r18csp1223046edc; Fri, 4 Nov 2016 09:27:21 -0700 (PDT) X-Received: by 10.194.222.225 with SMTP id qp1mr12602035wjc.161.1478276841304; Fri, 04 Nov 2016 09:27:21 -0700 (PDT) Return-Path: Received: from orth.archaic.org.uk (orth.archaic.org.uk. [2001:8b0:1d0::2]) by mx.google.com with ESMTPS id x70si5977045wmf.147.2016.11.04.09.27.21 for (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Fri, 04 Nov 2016 09:27:21 -0700 (PDT) Received-SPF: pass (google.com: best guess record for domain of pm215@archaic.org.uk designates 2001:8b0:1d0::2 as permitted sender) client-ip=2001:8b0:1d0::2; Authentication-Results: mx.google.com; spf=pass (google.com: best guess record for domain of pm215@archaic.org.uk designates 2001:8b0:1d0::2 as permitted sender) smtp.mailfrom=pm215@archaic.org.uk; dmarc=fail (p=NONE dis=NONE) header.from=linaro.org Received: from pm215 by orth.archaic.org.uk with local (Exim 4.84_2) (envelope-from ) id 1c2hKo-000324-Vt; Fri, 04 Nov 2016 16:27:18 +0000 From: Peter Maydell To: qemu-devel@nongnu.org Cc: patches@linaro.org, Stefan Hajnoczi Subject: [PATCH] docs/tracing.txt: Update documentation of default backend Date: Fri, 4 Nov 2016 16:27:17 +0000 Message-Id: <1478276837-31780-1-git-send-email-peter.maydell@linaro.org> X-Mailer: git-send-email 2.7.4 In commit baf86d6b3c we switched the default trace backend from "nop" to "log". Update the documentation to match. Signed-off-by: Peter Maydell --- 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.