Re: [PATCH 7/7] perf tools: add feature header record to pipe-mode

[Jiri Olsa <jolsa@redhat.com>]

On Wed, May 17, 2017 at 09:16:02PM -0700, David Carrillo-Cisneros wrote:
> Add header record types to pipe-mode, reusing the functions
> used in file-mode and leveraging the new struct feat_fd.
> 
> Add the perf_event__synthesize_feature event call back to
> process the new header records.
> 
> Before this patch:
> 
>   $ perf record -o - -e cycles -c 100000 sleep 1 | perf report --stdio
>   [ perf record: Woken up 1 times to write data ]
>   [ perf record: Captured and wrote 0.000 MB - ]
>   ...
> 
> After this patch:
>   $ perf record -o - -e cycles -c 100000 sleep 1 | perf report --stdio
>   [ perf record: Woken up 1 times to write data ]
>   [ perf record: Captured and wrote 0.000 MB - ]
>   # hostname : lphh7
>   # os release : 4.11.0-dbx-up_perf
>   # perf version : 4.11.rc6.g6277c80
>   # arch : x86_64
>   # nrcpus online : 72
>   # nrcpus avail : 72
>   # cpudesc : Intel(R) Xeon(R) CPU E5-2696 v3 @ 2.30GHz
>   # cpuid : GenuineIntel,6,63,2
>   # total memory : 263457192 kB
>   # cmdline : /root/perf record -o - -e cycles -c 100000 sleep 1
>   # HEADER_CPU_TOPOLOGY info available, use -I to display
>   # HEADER_NUMA_TOPOLOGY info available, use -I to display
>   # pmu mappings: intel_bts = 6, uncore_imc_4 = 22, uncore_sbox_1 = 47, uncore_cbox_5 = 33, uncore_ha_0 = 16, uncore_cbox
>    Percent |      Source code & Disassembly of kcore for cycles (9 samples)
>   ...

thanks a lot for doing this, comments comming shortly

jirka