linux-kernel - Re: [PATCHSET 00/10] perf tools: Apply percent-limit to callchains (v2)

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Date:	Thu, 28 Jan 2016 09:16:11 +0100
From:	Jiri Olsa <jolsa@...hat.com>
To:	Namhyung Kim <namhyung@...nel.org>
Cc:	Arnaldo Carvalho de Melo <acme@...nel.org>,
	Ingo Molnar <mingo@...nel.org>,
	Peter Zijlstra <peterz@...radead.org>,
	Jiri Olsa <jolsa@...nel.org>,
	LKML <linux-kernel@...r.kernel.org>,
	Andi Kleen <andi@...stfloor.org>,
	David Ahern <dsahern@...il.com>,
	Frederic Weisbecker <fweisbec@...il.com>,
	Wang Nan <wangnan0@...wei.com>
Subject: Re: [PATCHSET 00/10] perf tools: Apply percent-limit to callchains
 (v2)

On Thu, Jan 28, 2016 at 12:40:47AM +0900, Namhyung Kim wrote:
> Hello,
> 
> This patchset tries to implement percent limit to callchains which was
> requested by Andi Kleen.  For some reason, limiting callchains by
> (overhead) percentage didn't work well.  This patch fixes it and make
> --percent-limit also works for callchains as well as hist entries.
> 
>  * Changes from v1)
>   - fix insertion path instead of changing all UI code
>   - show percent value even on single path (if needed)
>   - change default callchain percent limit
>   
> This is available on 'perf/callchain-limit-v2' branch in my tree:
> 
>   git://git.kernel.org/pub/scm/linux/kernel/git/namhyung/linux-perf.git
> 
> Any comments are welcome,
> 
> Thanks,
> Namhyung
> *** BLURB HERE ***
> 
> Namhyung Kim (10):
>   perf hists: Fix min callchain hits calculation
>   perf hists: Update hists' total period when adding entries
>   perf report: Apply --percent-limit to callchains also
>   perf report: Get rid of hist_entry__callchain_fprintf()
>   perf tools: Pass parent_samples to __callchain__fprintf_graph()
>   perf report: Fix percent display in callchains on --stdio
>   perf hists browser: Fix dump to show correct callchain style
>   perf hists browser: Pass parent_total to callchain print functions
>   perf hists browser: Fix percent display in callchains
>   perf tools: Change default calchain percent limit to 0.005%

also I see extra fo entries with callchain filtered out in stdio mode

jirka


---
     8.41%  yes      libc-2.21.so      [.] fputs_unlocked                
            |
            ---fputs_unlocked
               |          
               |--5.67%--0x757074756f206472
               |          
                --2.74%--0x3ba8e0
                          0x21e000

     2.47%  yes      yes               [.] fputs_unlocked@plt            
            |
            ---fputs_unlocked@plt
               0x3ba8e0
               0x21e000

     0.12%  yes      [kernel.vmlinux]  [k] vfs_write                     

     0.09%  yes      libc-2.21.so      [.] _IO_do_write@@GLIBC_2.2.5     

     0.08%  yes      [kernel.vmlinux]  [k] entry_SYSCALL_64              

     0.07%  yes      [kernel.vmlinux]  [k] fsnotify                      

     0.06%  yes      [kernel.vmlinux]  [k] sys_write