Hi Andrea,

On Tue, 3 Mar 2020 at 09:34, Andrea Brunato <Andrea.Brunato@arm.com> wrote:
>
> Good afternoon,
>
> When using perf to record a simple benchmark I see the following warning:
>
> $ perf record --per-thread -e cs_etm/sinkid=0xa6509eae/u  ~/afdo/coremark/coremark/coremark.exe  0x3415 0x3415 0x66 0 7 1 2000  > run2.log

What is "sinkid=0xa6509eae" ?

> [ perf record: Woken up 6 times to write data ]
> Warning:
> AUX data lost 6 times out of 6!
>
> [ perf record: Captured and wrote 0.378 MB perf.data ]
>
> This is on DB845c (https://www.96boards.org/product/rb3-platform/), kernel 5.5.0-rc7.
>
> It looks like perf is losing data and the reported perf.data file is very tiny, given that the application runs for several seconds.
> Does anybody have any idea about what it may be causing this?
>
> I've tried adding --mmap-pages=32K,64K to the command for increasing the buffer size, but it's not actually solving the problem
>
> Thanks,
> Andrea
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