Re: [PATCH v2 13/51] IB/qib: Add qib_driver.c

Steve Wise
2010-04-07T19:24:06Z

Roland Dreier wrote:
> > +unsigned qib_debug;
> > +module_param_named(debug, qib_debug, uint, S_IWUSR | S_IRUGO);
> > +MODULE_PARM_DESC(debug, "mask for debug prints");
>
> Did you look at using trace events for this stuff? That gives you
> extremely low overhead when tracing is turned off (dynamic patching to
> NOP out the tracing when it's disabled) and also very fine-grained (per
> trace site) control over what gets printed; plus you get dumping of the
> trace buffer on crash, etc.
>
> - R.
>

Where can I find information on trace events? Something in Documentation/*?

Thanks,

Steve.