From: Stefan Hajnoczi <stefanha@redhat.com>
To: qemu-devel@nongnu.org
Cc: Stefan Hajnoczi <stefanha@redhat.com>
Subject: [Qemu-devel] [PATCH 3/4] trace: document '-' syntax for disabling events
Date: Fri, 16 Nov 2012 14:19:24 +0100 [thread overview]
Message-ID: <1353071965-19804-4-git-send-email-stefanha@redhat.com> (raw)
In-Reply-To: <1353071965-19804-1-git-send-email-stefanha@redhat.com>
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
---
docs/tracing.txt | 4 ++++
1 file changed, 4 insertions(+)
diff --git a/docs/tracing.txt b/docs/tracing.txt
index c541133..7901409 100644
--- a/docs/tracing.txt
+++ b/docs/tracing.txt
@@ -139,6 +139,10 @@ having a common prefix in a batch. For example, virtio-blk trace events could
be enabled using:
trace-event virtio_blk_* on
+If a line in the "-trace events=<file>" file begins with a '-', the trace event
+will be disabled instead of enabled. This is useful when a wildcard was used
+to enable an entire family of events but one noisy event needs to be disabled.
+
== Trace backends ==
The "tracetool" script automates tedious trace event code generation and also
--
1.8.0
next prev parent reply other threads:[~2012-11-16 13:19 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-11-16 13:19 [Qemu-devel] [PULL 0/4] Tracing patches Stefan Hajnoczi
2012-11-16 13:19 ` [Qemu-devel] [PATCH 1/4] Avoid all systemtap reserved words Stefan Hajnoczi
2012-11-16 13:19 ` [Qemu-devel] [PATCH 2/4] trace: allow disabling events in events file Stefan Hajnoczi
2012-11-16 13:19 ` Stefan Hajnoczi [this message]
2012-11-16 13:19 ` [Qemu-devel] [PATCH 4/4] trace: Remove "info trace" from documents Stefan Hajnoczi
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