Messages in this thread | | | Date | Thu, 18 Nov 2010 15:02:55 +0100 | From | Frederic Weisbecker <> | Subject | Re: [RFC][PATCH 0/2] tracing: Have trace_printk()s in the events/ directory |
| |
On Thu, Nov 18, 2010 at 08:06:36AM -0500, Steven Rostedt wrote: > On Thu, 2010-11-18 at 13:53 +0100, Frederic Weisbecker wrote: > > n other solution, which have been talking with Thomas yesterday, would be > > to allow having a single fd for several perf_events at once. That would > > solve some problems when you have hundreds of events opened (think about > > wide tracing, or use of all individual syscalls). > > I would highly recommend this. One type of tracing I do all the time is > to enable all events (over 600). I don't think that is currently > possible with trace and/or perf.
Yep.
> Ftrace has no issue simple because it just stores all the events into a > single buffer (per cpu though). It does not care if there's one event or > 1000. > > You need to figure out how to do this as well with the function tracer.
Yeah for the function (and graph) tracers, I really plan to make it a single event. I mean one for the function tracer and one for the function graph. Although we may want two for the function graph tracer actually. One for entry, one for exit.
| |