linux-kernel - Re: [PATCH 4/7] perf diff: Fix to sort by baseline field by default

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Date:	Tue, 23 Dec 2014 13:12:13 +0900
From:	Namhyung Kim <namhyung@...nel.org>
To:	Arnaldo Carvalho de Melo <acme@...nel.org>
Cc:	Ingo Molnar <mingo@...nel.org>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Jiri Olsa <jolsa@...hat.com>,
	LKML <linux-kernel@...r.kernel.org>,
	David Ahern <dsahern@...il.com>,
	Stephane Eranian <eranian@...gle.com>,
	Adrian Hunter <adrian.hunter@...el.com>
Subject: Re: [PATCH 4/7] perf diff: Fix to sort by baseline field by default

On Mon, Dec 22, 2014 at 11:45:13AM -0300, Arnaldo Carvalho de Melo wrote:
> Looks better, here I tried running 'perf record usleep 1'  in quick
> succession to then run 'perf diff'  before and after this patch, got:
> 
> Before:
> 
> [ssdandy ~]$ cat /tmp/before
> # Event 'cycles'
> #
> # Baseline    Delta  Shared Object     Symbol                        
> # ........  .......  ................  ..............................
> #
>             +36.29%  [kernel.vmlinux]  [k] __split_vma.isra.31       
>     34.55%           [kernel.vmlinux]  [k] copy_user_generic_unrolled
>              +2.45%  [kernel.vmlinux]  [k] local_clock               
>      0.11%   +0.02%  [kernel.vmlinux]  [k] native_write_msr_safe     
>      2.12%           [kernel.vmlinux]  [k] perf_event_comm_output    
>             +61.13%  [kernel.vmlinux]  [k] unmap_page_range          
>     63.22%           libc-2.17.so      [.] 0x000000000007c3e0        
> [acme@...andy ~]$
> 
> After:
> 
> [acme@...andy linux]$ perf diff
> # Event 'cycles'
> #
> # Baseline    Delta  Shared Object     Symbol                        
> # ........  .......  ................  ..............................
> #
>     63.22%           libc-2.17.so      [.] 0x000000000007c3e0        
>     34.55%           [kernel.vmlinux]  [k] copy_user_generic_unrolled
>      2.12%           [kernel.vmlinux]  [k] perf_event_comm_output    
>      0.11%   +0.02%  [kernel.vmlinux]  [k] native_write_msr_safe     
>             +36.29%  [kernel.vmlinux]  [k] __split_vma.isra.31       
>              +2.45%  [kernel.vmlinux]  [k] local_clock               
>             +61.13%  [kernel.vmlinux]  [k] unmap_page_range          
> [acme@...andy linux]$
> 
> Which was ok up to the point where symbols that only appeared on the
> second run were not sorted by delta, can you fix that?

I'll do that later.


> 
> Please let me know if it is better to apply this one then a followup to
> sort the deltas or if a combined patch to achieve both is best.

I prefer applying this for now and then improve sorting later..

> 
> I.e.:
> 
> [acme@...andy linux]$ perf diff
> # Event 'cycles'
> #
> # Baseline    Delta  Shared Object     Symbol                        
> # ........  .......  ................  ..............................
> #
>     63.22%           libc-2.17.so      [.] 0x000000000007c3e0        
>     34.55%           [kernel.vmlinux]  [k] copy_user_generic_unrolled
>      2.12%           [kernel.vmlinux]  [k] perf_event_comm_output    
>      0.11%   +0.02%  [kernel.vmlinux]  [k] native_write_msr_safe     
>             +61.13%  [kernel.vmlinux]  [k] unmap_page_range          
>             +36.29%  [kernel.vmlinux]  [k] __split_vma.isra.31       
>              +2.45%  [kernel.vmlinux]  [k] local_clock               
> 
> [acme@...andy linux]$
> 
> Humm, but then wouldn't we be more interested in sorting _everything_ by
> delta?

I don't understand whay you said..  what do you mean by 'everything be
delta'?  Is that something other than perf diff -o 1 ?

Thanks,
Namhyung
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