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From: "Jin, Yao" <yao.jin@linux.intel.com>
To: Ravi Bangoria <ravi.bangoria@linux.ibm.com>
Cc: acme@kernel.org, jolsa@kernel.org, peterz@infradead.org,
	mingo@redhat.com, alexander.shishkin@linux.intel.com,
	Linux-kernel@vger.kernel.org, ak@linux.intel.com,
	kan.liang@intel.com, yao.jin@intel.com
Subject: Re: [PATCH v3 2/2] Support interactive annotation of code without symbols
Date: Mon, 24 Feb 2020 23:46:51 +0800	[thread overview]
Message-ID: <e64bcf96-a424-42da-d38d-d9160fb102f6@linux.intel.com> (raw)
In-Reply-To: <ec14c25e-e868-a073-2799-55d55ae23e1f@linux.ibm.com>



On 2/24/2020 9:56 PM, Ravi Bangoria wrote:
> 
> 
> On 2/24/20 7:52 AM, Jin Yao wrote:
>> For perf report on stripped binaries it is currently impossible to do
>> annotation. The annotation state is all tied to symbols, but there are
>> either no symbols, or symbols are not covering all the code.
>>
>> We should support the annotation functionality even without symbols.
>>
>> This patch fakes a symbol and the symbol name is the string of address.
>> After that, we just follow current annotation working flow.
>>
>> For example,
>>
>> 1. perf report
>>
>> Overhead  Command  Shared Object     Symbol
>>    20.67%  div      libc-2.27.so      [.] __random_r
>>    17.29%  div      libc-2.27.so      [.] __random
>>    10.59%  div      div               [.] 0x0000000000000628
>>     9.25%  div      div               [.] 0x0000000000000612
>>     6.11%  div      div               [.] 0x0000000000000645
>>
>> 2. Select the line of "10.59%  div      div               [.] 
>> 0x0000000000000628" and ENTER.
>>
>> Annotate 0x0000000000000628
>> Zoom into div thread
>> Zoom into div DSO (use the 'k' hotkey to zoom directly into the kernel)
>> Browse map details
>> Run scripts for samples of symbol [0x0000000000000628]
>> Run scripts for all samples
>> Switch to another data file in PWD
>> Exit
>>
>> 3. Select the "Annotate 0x0000000000000628" and ENTER.
>>
>> Percent│
>>         │
>>         │
>>         │     Disassembly of section .text:
>>         │
>>         │     0000000000000628 <.text+0x68>:
>>         │       divsd %xmm4,%xmm0
>>         │       divsd %xmm3,%xmm1
>>         │       movsd (%rsp),%xmm2
>>         │       addsd %xmm1,%xmm0
>>         │       addsd %xmm2,%xmm0
>>         │       movsd %xmm0,(%rsp)
> This might be an add on...
> 
> Even though there are samples on a particular instruction, 'Percent' column
> is empty, I guess, because we don't have symbol length?
> 
> Should we show 'global percent'? Or nr samples? Will it be useful?
> 
> Ravi
> 

As the mail I reply to Jiri, if we use the Jiri's idea, we can collect 
the hits for dummy symbols then we can show the percent of dummy symbol 
here.

Thanks
Jin Yao


  reply	other threads:[~2020-02-24 15:46 UTC|newest]

Thread overview: 15+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-02-24  2:22 [PATCH v3 0/2] perf report: Support " Jin Yao
2020-02-24  2:22 ` [PATCH v3 1/2] perf util: Print al_addr when symbol is not found Jin Yao
2020-02-24  2:22 ` [PATCH v3 2/2] Support interactive annotation of code without symbols Jin Yao
2020-02-24 12:35   ` Jiri Olsa
2020-02-24 15:39     ` Jin, Yao
2020-02-24 20:46       ` Jiri Olsa
2020-02-24 13:25   ` Ravi Bangoria
2020-02-24 13:51     ` Jiri Olsa
2020-02-24 14:04       ` Ravi Bangoria
2020-02-24 15:53         ` Jin, Yao
2020-02-24 15:44     ` Jin, Yao
2020-02-24 13:56   ` Ravi Bangoria
2020-02-24 15:46     ` Jin, Yao [this message]
2020-02-27 13:50 ` [PATCH v3 0/2] perf report: Support " Arnaldo Carvalho de Melo
2020-02-27 14:47   ` Jin, Yao

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