Messages in this thread | | | From | "Javi Merino" <> | Date | Fri, 11 Jul 2014 09:27:55 +0100 | Subject | Re: [RFC PATCH v5 09/10] thermal: add trace events to the power allocator governor |
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On Thu, Jul 10, 2014 at 07:03:50PM +0100, Steven Rostedt wrote: > On Thu, 10 Jul 2014 17:20:14 +0100 > "Javi Merino" <javi.merino@arm.com> 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.
Sounds good, I'll do that.
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