On Thu, 10 Jul 2014 17:20:14 +0100 "Javi Merino" <[email protected]> wrote:
> > > > How many CPUs are you saving load_cpu on? A trace event can't be bigger > > than a page. And the data is actually a little less than that with the > > required headers. > > The biggest system I've tested it on is an 8 cpu system (with > NR_CPUS==8). So yes, small and we haven't seen any issues. > > Are you saying that we are siphoning too much data through ftrace? He > find it really valuable to collect information during run and process > it afterwards but I can see how this may not be feasible for systems > with thousands of cpus. Only too much for a single event. Perhaps have the tracepoint post per CPU? Then you wouldn't need that array. -- Steve -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
