linux-kernel - Re: [PATCH v1 0/5] perf report: Support sorting all blocks by cycles

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Date:   Mon, 14 Oct 2019 17:32:13 +0200
From:   Jiri Olsa <jolsa@...hat.com>
To:     Jin Yao <yao.jin@...ux.intel.com>
Cc:     acme@...nel.org, jolsa@...nel.org, peterz@...radead.org,
        mingo@...hat.com, alexander.shishkin@...ux.intel.com,
        Linux-kernel@...r.kernel.org, ak@...ux.intel.com,
        kan.liang@...el.com, yao.jin@...el.com
Subject: Re: [PATCH v1 0/5] perf report: Support sorting all blocks by cycles

On Tue, Oct 08, 2019 at 03:04:57PM +0800, Jin Yao wrote:
> It would be useful to support sorting for all blocks by the
> sampled cycles percent per block. This is useful to concentrate
> on the globally busiest/slowest blocks.
> 
> This patch series implements a new sort option "total_cycles" which
> sorts all blocks by 'Sampled Cycles%'. The 'Sampled Cycles%' is
> block sampled cycles aggregation / total sampled cycles
> 
> For example,
> 
> perf record -b ./div
> perf report -s total_cycles --stdio
> 
>  # To display the perf.data header info, please use --header/--header-only options.
>  #
>  #
>  # Total Lost Samples: 0
>  #
>  # Samples: 2M of event 'cycles'
>  # Event count (approx.): 2753248
>  #
>  # Sampled Cycles%  Sampled Cycles  Avg Cycles%  Avg Cycles                                              [Program Block Range]         Shared Object
>  # ...............  ..............  ...........  ..........  .................................................................  ....................
>  #
>             26.04%            2.8M        0.40%          18                                             [div.c:42 -> div.c:39]                   div
>             15.17%            1.2M        0.16%           7                                 [random_r.c:357 -> random_r.c:380]          libc-2.27.so
>              5.11%          402.0K        0.04%           2                                             [div.c:27 -> div.c:28]                   div
>              4.87%          381.6K        0.04%           2                                     [random.c:288 -> random.c:291]          libc-2.27.so
>              4.53%          381.0K        0.04%           2                                             [div.c:40 -> div.c:40]                   div
>              3.85%          300.9K        0.02%           1                                             [div.c:22 -> div.c:25]                   div
>              3.08%          241.1K        0.02%           1                                           [rand.c:26 -> rand.c:27]          libc-2.27.so
>              3.06%          240.0K        0.02%           1                                     [random.c:291 -> random.c:291]          libc-2.27.so
>              2.78%          215.7K        0.02%           1                                     [random.c:298 -> random.c:298]          libc-2.27.so
>              2.52%          198.3K        0.02%           1                                     [random.c:293 -> random.c:293]          libc-2.27.so
>              2.36%          184.8K        0.02%           1                                           [rand.c:28 -> rand.c:28]          libc-2.27.so
>              2.33%          180.5K        0.02%           1                                     [random.c:295 -> random.c:295]          libc-2.27.so
>              2.28%          176.7K        0.02%           1                                     [random.c:295 -> random.c:295]          libc-2.27.so
>              2.20%          168.8K        0.02%           1                                         [rand@...+0 -> rand@...+0]                   div
>              1.98%          158.2K        0.02%           1                                 [random_r.c:388 -> random_r.c:388]          libc-2.27.so
>              1.57%          123.3K        0.02%           1                                             [div.c:42 -> div.c:44]                   div
>              1.44%          116.0K        0.42%          19                                 [random_r.c:357 -> random_r.c:394]          libc-2.27.so
>  ......
> 
> This patch series supports both stdio and tui. And also with the supporting
> of --percent-limit.
> 
> Jin Yao (5):
>   perf util: Create new block.h/block.c for block related functions
>   perf util: Count the total cycles of all samples
>   perf report: Sort by sampled cycles percent per block for stdio
>   perf report: Support --percent-limit for total_cycles
>   perf report: Sort by sampled cycles percent per block for tui

sry for delay, but I can no longer apply this
could you please rebase?

thanks,
jirka