Messages in this thread | | | Date | Tue, 2 Oct 2018 17:42:34 +0200 | From | Jiri Olsa <> | Subject | Re: [PATCH v1 2/2] perf record: Support weak groups |
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On Mon, Oct 01, 2018 at 12:59:27PM -0700, Andi Kleen wrote: > From: Andi Kleen <ak@linux.intel.com> > > Implement a weak group fallback for perf record, similar to the existing perf stat support. > This allows to use groups that might be longer than the available counters without > failing. > > Before: > > $ perf record -e '{cycles,cache-misses,cache-references,cpu_clk_unhalted.thread,cycles,cycles,cycles}' -a sleep 1 > Error: > The sys_perf_event_open() syscall returned with 22 (Invalid argument) for event (cycles). > /bin/dmesg | grep -i perf may provide additional information. > > After: > > $ ./perf record -e '{cycles,cache-misses,cache-references,cpu_clk_unhalted.thread,cycles,cycles,cycles}:W' -a sleep 1 > WARNING: No sample_id_all support, falling back to unordered processing > [ perf record: Woken up 3 times to write data ] > [ perf record: Captured and wrote 8.136 MB perf.data (134069 samples) ] > > Signed-off-by: Andi Kleen <ak@linux.intel.com>
Acked-by: Jiri Olsa <jolsa@kernel.org>
thanks, jirka
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