On Tue, Sep 27, 2011 at 9:00 AM, Stefan Hajnoczi <stefa...@linux.vnet.ibm.com> wrote: > SystemTap provides a "semaphore" that can optionally be tested before > executing a trace event. The purpose of this mechanism is to skip > expensive tracing code when the trace event is disabled. > > For example, some applications may have trace events that format or > convert strings for trace events. This expensive processing should only > be done in the case where the trace event is enabled. > > Since QEMU's generated trace events never have such special-purpose > code, there is no reason to add the semaphore check. > > Signed-off-by: Stefan Hajnoczi <stefa...@linux.vnet.ibm.com> > --- > scripts/tracetool | 4 +--- > 1 files changed, 1 insertions(+), 3 deletions(-)
Oops, this never got merged. I have added it to my tracing queue and it will be part of the next pull request: https://github.com/stefanha/qemu/tree/tracing Stefan
