Re: Recording memory addresses on ARM

[Andi Kleen <ak@linux.intel.com>]

Kim Phillips <kim.phillips@arm.com> writes:
>
> I see ./perf report --help says:
>
>        --mem-mode
>            Use the data addresses of samples in addition to instruction addresses to build the histograms. To generate meaningful output,
>            the perf.data file must have been obtained using perf record -d -W and using a special event -e cpu/mem-loads/ or -e
>            cpu/mem-stores/. See perf mem for simpler access.
>
> yet perf record's -W switch isn't on record's manpage, and trying the
> invocation sequence on x86 using a perf built from today's acme's
> perf/urgent branch:
>
> $ ./perf version
> perf version 4.13.rc5.g59410f5
> $ ./perf record -e cpu/mem-loads/u -d -W -p 3722 sleep 1


The help suggestion seems to be incorrect, this needs to be cpu/mem-loads/upp
(pp to enable PEBS)

With PEBS the event produces no samples.


-Andi