From patchwork Fri Nov 16 13:19:24 2012 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit Subject: [3/4] trace: document '-' syntax for disabling events Date: Fri, 16 Nov 2012 03:19:24 -0000 From: Stefan Hajnoczi X-Patchwork-Id: 199594 Message-Id: <1353071965-19804-4-git-send-email-stefanha@redhat.com> To: Cc: Stefan Hajnoczi Signed-off-by: Stefan Hajnoczi --- 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 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