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

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Date:   Thu, 18 May 2017 18:12:58 +0200
From:   Jiri Olsa <jolsa@...hat.com>
To:     David Carrillo-Cisneros <davidcc@...gle.com>
Cc:     linux-kernel@...r.kernel.org,
        Peter Zijlstra <peterz@...radead.org>,
        Ingo Molnar <mingo@...hat.com>,
        Arnaldo Carvalho de Melo <acme@...nel.org>,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        Andi Kleen <ak@...ux.intel.com>, Simon Que <sque@...omium.org>,
        Wang Nan <wangnan0@...wei.com>, Jiri Olsa <jolsa@...nel.org>,
        He Kuang <hekuang@...wei.com>,
        Masami Hiramatsu <mhiramat@...nel.org>,
        David Ahern <dsa@...ulusnetworks.com>,
        Namhyung Kim <namhyung@...nel.org>,
        Stephane Eranian <eranian@...gle.com>,
        Paul Turner <pjt@...gle.com>
Subject: Re: [PATCH 7/7] perf tools: add feature header record to pipe-mode

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