Messages in this thread | | | From | Vince Weaver <> | Date | Tue, 9 Jun 2015 16:07:01 -0400 (EDT) | Subject | Re: perf/ftrace: does PERF_EVENT_IOC_SET_FILTER serve any purpose? |
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On Tue, 9 Jun 2015, Steven Rostedt wrote:
> What kernel are you using? You may need to update perf. > > We switched to a tracefs filesystem, but the old perf wont read any > events if it's not located in debugfs. That is, it actually tested > which filesystem the event files were mounted on, and if they didn't > match the debugfs mount type, it ignored them. That was fixed recently.
I am running 4.1-rc7 and was trying to use perf_4.0.
If I use the kernel's version of perf it works.
sigh.
Vince
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