Messages in this thread | | | Date | Mon, 13 Aug 2018 12:46:42 -0500 | From | Kim Phillips <> | Subject | Re: [PATCH v3 0/7] perf: Add ioctl for PMU driver configuration |
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On Wed, 18 Jul 2018 15:48:00 -0600 Mathieu Poirier <mathieu.poirier@linaro.org> wrote:
> This set adds the capability to communiate event specific configuration > to the PMU kernel driver using an ioctl(). The functionatlity is made > generic enough for anyone to use but is targeted at the identification > of CoreSight sinks when operating in CPU-wide trace scenarios. > > --- > Changes for V3: > . Return an error for CPU-wide scenarios while the feature is being > implemented (Kim)
Hi, I'm giving this series a short test-drive on Juno.
It yields success for the --per-thread case..:
$ sudo taskset -c 0 ./perf record -e cs_etm/@20010000.etf/ --per-thread uname -a Linux juno 4.18.0-rc8-00011-gb82af52c4b35-dirty #147 SMP PREEMPT Thu Aug 9 11:20:37 CDT 2018 aarch64 GNU/Linux [ perf record: Woken up 0 times to write data ] Warning: AUX data lost 1 times out of 2!
[ perf record: Captured and wrote 0.067 MB perf.data ] $
..but not for CPU-wide?:
$ sudo taskset -c 0 ./perf record -e cs_etm/@20010000.etf/ uname -a failed to mmap with 12 (Cannot allocate memory) $ sudo taskset -c 0 ./perf record -e cs_etm/@20010000.etf/ -C 0 uname -a failed to mmap with 12 (Cannot allocate memory) $
Thanks,
Kim
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