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

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Date:   Tue, 15 Oct 2019 10:00:19 +0800
From:   "Jin, Yao" <yao.jin@...ux.intel.com>
To:     Jiri Olsa <jolsa@...hat.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 10/14/2019 11:32 PM, Jiri Olsa wrote:
> 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?
> 

Sure, I'd like to rebase to latest perf/core branch. I will send v2 soon. :)

Thanks
Jin Yao

> thanks,
> jirka
>