linux-kernel - Re: [PATCH v3 0/3] perf report/annotate: Support average IPC and IPC coverage for function

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Message-ID: <20181128101846.GB11280@krava>
Date:   Wed, 28 Nov 2018 11:18:46 +0100
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 v3 0/3] perf report/annotate: Support average IPC and IPC
 coverage for function

On Wed, Nov 28, 2018 at 11:17:57AM +0100, Jiri Olsa wrote:
> On Wed, Nov 28, 2018 at 11:14:55PM +0800, Jin Yao wrote:
> > Add supporting of displaying the average IPC and IPC coverage
> > percentage per function.
> > 
> > For example,
> > 
> > $ perf record -b ...
> > $ perf report -s symbol or
> >   perf report -s symbol --stdio
> > 
> > Overhead  Symbol                           IPC   [IPC Coverage]
> >   39.60%  [.] __random                     2.30  [ 54.8%]
> >   18.02%  [.] main                         0.43  [ 54.3%]
> >   14.21%  [.] compute_flag                 2.29  [100.0%]
> >   14.16%  [.] rand                         0.36  [100.0%]
> >    7.06%  [.] __random_r                   2.57  [ 70.5%]
> >    6.85%  [.] rand@plt                     0.00  [  0.0%]
> >   ...
> > 
> > $ perf annotate --stdio2
> > 
> > Percent  IPC Cycle (Average IPC: 2.30, IPC Coverage: 54.8%)
> > 
> >                         Disassembly of section .text:
> > 
> >                         000000000003aac0 <random@@GLIBC_2.2.5>:
> >   8.32  3.28              sub    $0x18,%rsp
> >         3.28              mov    $0x1,%esi
> >         3.28              xor    %eax,%eax
> >         3.28              cmpl   $0x0,argp_program_version_hook@@GLIBC_2.2.5+0x1e0
> >  11.57  3.28     1      ↓ je     20
> >                           lock   cmpxchg %esi,__abort_msg@@GLIBC_PRIVATE+0x8a0
> >                         ↓ jne    29
> >                         ↓ jmp    43
> >  11.57  1.10        20:   cmpxchg %esi,__abort_msg@@GLIBC_PRIVATE+0x8a0
> >  ...
> > 
> > v3:
> > ---
> >     Remove the sortkey "ipc" from command-line. The columns "IPC"
> >     and "[IPC Coverage]" are automatically enabled when "symbol"
> >     is specified.
> > 
> >     Patch "perf report: Display average IPC and IPC coverage per symbol"
> >     is impacted.
> > 
> > v2:
> > ---
> >   1. Merge in Jiri's patch to support stdio mode
> > 
> >   2. Add a new patch "perf annotate: Create a annotate2 flag
> >      in struct symbol" which records if the symbol has been
> >      annotated yet.
> > 
> >   3. Minor update such as adding { } for multiline code in 'if'
> >      condition.
> > 
> > Jin Yao (3):
> >   perf annotate: Compute average IPC and IPC coverage per symbol
> >   perf annotate: Create a annotate2 flag in struct symbol
> >   perf report: Display average IPC and IPC coverage per symbol
> 
> hi,
> I took he liberty and moved the annotation retrieval into
> resort phase under progress bar scope. It's currently on top
> of my perf/fixes branch, could you please check it?
> 
>   git://git.kernel.org/pub/scm/linux/kernel/git/jolsa/perf.git

commits:
7f3ffdb9783f perf tools: Move symbol annotation to resort
e87f7d3c4f10 perf tools: Add perf_evsel__output_resort_cb function
40012b422108 perf tools: Add argument to hists__resort_cb_t callback

jirka