linux-kernel - Re: [PATCH] perf, tools, report: Add srcline

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Date:	Sat, 21 May 2016 14:01:51 +0200
From:	Jiri Olsa <jolsa@...hat.com>
To:	Andi Kleen <andi@...stfloor.org>
Cc:	acme@...nel.org, jolsa@...nel.org, linux-kernel@...r.kernel.org,
	Andi Kleen <ak@...ux.intel.com>
Subject: Re: [PATCH] perf, tools, report: Add srcline_from/to branch sort keys

On Fri, May 20, 2016 at 01:15:08PM -0700, Andi Kleen wrote:
> From: Andi Kleen <ak@...ux.intel.com>
> 
> Add srcline_from and srcline_to branch sort keys that allow
> to show the source lines of a branch. That makes it much easier
> to track down where particular branches happen in the program,
> for example to examine branch mispredictions, or to associate
> it with cycle counts:
> 
> % perf record -b -e cycles:p ./tcall
> % perf report --sort srcline_from,srcline_to,mispredict
> ...
>     15.10%  tcall.c:18                                 tcall.c:10                                  N
>     14.83%  tcall.c:11                                 tcall.c:5                                   N
>     14.12%  tcall.c:7                                  tcall.c:12                                  N
>     14.04%  tcall.c:12                                 tcall.c:5                                   N
>     12.42%  tcall.c:17                                 tcall.c:18                                  N
>     12.39%  tcall.c:7                                  tcall.c:13                                  N
>     12.27%  tcall.c:13                                 tcall.c:17                                  N
> ...
> 
> % perf report --sort srcline_from,srcline_to,cycles
> ...
>     17.12%  tcall.c:18                                 tcall.c:11                                                  1
>     17.01%  tcall.c:12                                 tcall.c:6                                                   1
>     16.98%  tcall.c:11                                 tcall.c:6                                                   1
>     15.91%  tcall.c:17                                 tcall.c:18                                                  1
>      6.38%  tcall.c:7                                  tcall.c:17                                                  7
>      4.80%  tcall.c:7                                  tcall.c:12                                                  8
>      4.21%  tcall.c:7                                  tcall.c:17                                                  8
>      2.67%  tcall.c:7                                  tcall.c:12                                                  7
>      2.62%  tcall.c:7                                  tcall.c:12                                                  10
>      2.10%  tcall.c:7                                  tcall.c:17                                                  9
>      1.58%  tcall.c:7                                  tcall.c:12                                                  6
>      1.44%  tcall.c:7                                  tcall.c:12                                                  5
>      1.38%  tcall.c:7                                  tcall.c:12                                                  9
>      1.06%  tcall.c:7                                  tcall.c:17                                                  13
>      1.05%  tcall.c:7                                  tcall.c:12                                                  4
>      1.01%  tcall.c:7                                  tcall.c:17                                                  6
> 
> Open issues:
> - Some kernel symbols get misresolved.

Acked-by: Jiri Olsa <jolsa@...nel.org>

thanks,
jirka