linux-kernel - Re: [PATCH V9 0/6] Freq/CPU%/CORE

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Date:	Wed, 9 Sep 2015 16:39:08 +0200
From:	Jiri Olsa <jolsa@...hat.com>
To:	kan.liang@...el.com
Cc:	acme@...nel.org, jolsa@...nel.org, a.p.zijlstra@...llo.nl,
	luto@...nel.org, mingo@...hat.com, eranian@...gle.com,
	ak@...ux.intel.com, mark.rutland@....com, adrian.hunter@...el.com,
	namhyung@...nel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH V9 0/6] Freq/CPU%/CORE_BUSY% support

On Tue, Sep 08, 2015 at 03:32:43PM -0400, kan.liang@...el.com wrote:
> From: Kan Liang <kan.liang@...el.com>
> 
> This patch set supports per-sample freq/CPU%/CORE_BUSY% print in perf
> report.
> For printing these information, the perf.data file must have been obtained
> by group read and using special events cycles, ref-cycles, msr/tsc/,
> msr/aperf/ or msr/mperf/.
> 
>  - Freq (MHz): The frequency during the sample interval. Needs cycles
>    ref-cycles event.
>  - CPU%: CPU utilization during the sample interval. Needs ref-cycles and
>    msr/tsc/ events.
>  - CORE_BUSY%: actual percent performance (APERF/MPERF%) during the
>    sample interval. Needs msr/aperf/ and msr/mperf/ events.
> 
> Here is an example:
> 
> $ perf record --freq-perf ~/tchain_edit
> 
> $ perf report --stdio --freq-perf
> 
>                                  Overhead   FREQ MHz   CPU%  CORE_BUSY%
> Command      Shared Object     Symbol
>  ........................................  .........  .....  ..........
> ...........  ................  ......................
> 
>     99.54%  99.54%  99.53%  99.53%  99.53%       2301     96         99
> tchain_edit  tchain_edit       [.] f3
>      0.20%   0.20%   0.20%   0.20%   0.20%       2301     98         99
> tchain_edit  tchain_edit       [.] f2
>      0.05%   0.05%   0.05%   0.05%   0.05%       2300     98         99
> tchain_edit  [kernel.vmlinux]  [k] read_tsc
> 
> Changes since V1:
>  - Save cpu max freq to header when recording
>  - Read cpu max freq and msr type from header when reporting
> 
> Changes since V2:
>  - Introduce generic FEAT for CPU related data stored
>  - Make cpu max freq and msr type part of perf_session_env
>  - rename cpu_u to cpu_util
>  - Don't save sample value in perf_sample and discards new iterator.
>    Calculating the freq_perf_info in add_entry_cb callback
>  - Introduce symbol_conf.freq_perf_type for related hpp column visibility
> 
> Changes since V3:
>  - add a identifier 'tag' for CPU attributes, max frequency.
>  - add backpointers to evlist for env, and evsel for evlist.
>  - Use bitmask for freq_perf_type
>  - Replace macros by functions to caculate freq, cpu_util and core_busy
>  - Move all caculation codes under symbol_conf.show_freq_perf condition.
> 
> Changes since V4:
>  - Store cpu attributes id as tag and more readable cpu_attr
> 
> Changes since V5:
>  - Rename freq to max_freq and use it
>  - Add a loop in process_cpu_attributes to facility future extension
> 
> Changes since V6:
>  - Split rename perf_session_env and add backpointer to evlist patches
> 
> Changes since V7:
>  - Introduce --freq-perf option for perf record
>  - Factor out fix for dump_sample
> 
> Changes since V8:
>  - Rename --show-freq-perf to --freq-perf 
>  - --freq-perf option imply --group

I believe I just acked all of it but the last one,
otherwise I'm ok with it

thanks,
jirka
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