From patchwork Mon Nov 5 07:50:09 2012 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit Subject: trace: document '-' syntax for disabling events Date: Sun, 04 Nov 2012 21:50:09 -0000 From: Stefan Hajnoczi X-Patchwork-Id: 197159 Message-Id: <1352101809-4753-1-git-send-email-stefanha@redhat.com> To: Cc: Gerd Hoffmann , 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