linux-kernel - Re: [PATCH 06/14] perf tools: show NMI overhead

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Date:   Fri, 25 Nov 2016 08:20:13 +0900
From:   Namhyung Kim <namhyung@...nel.org>
To:     Jiri Olsa <jolsa@...hat.com>
Cc:     "Liang, Kan" <kan.liang@...el.com>,
        "peterz@...radead.org" <peterz@...radead.org>,
        "mingo@...hat.com" <mingo@...hat.com>,
        "acme@...nel.org" <acme@...nel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "alexander.shishkin@...ux.intel.com" 
        <alexander.shishkin@...ux.intel.com>,
        "tglx@...utronix.de" <tglx@...utronix.de>,
        "jolsa@...nel.org" <jolsa@...nel.org>,
        "Hunter, Adrian" <adrian.hunter@...el.com>,
        "wangnan0@...wei.com" <wangnan0@...wei.com>,
        "mark.rutland@....com" <mark.rutland@....com>,
        "andi@...stfloor.org" <andi@...stfloor.org>
Subject: Re: [PATCH 06/14] perf tools: show NMI overhead

Hi,

On Thu, Nov 24, 2016 at 04:27:21PM +0100, Jiri Olsa wrote:
> On Thu, Nov 24, 2016 at 01:37:04PM +0000, Liang, Kan wrote:
> > 
> > 
> > > 
> > > On Wed, Nov 23, 2016 at 04:44:44AM -0500, kan.liang@...el.com wrote:
> > > > From: Kan Liang <kan.liang@...el.com>
> > > >
> > > > Caculate the total NMI overhead on each CPU, and display them in perf
> > > > report
> > > 
> > > so the output looks like this:
> > > 
> > > ---
> > > # Elapsed time: 1720167944 ns
> > > # Overhead:
> > > #       CPU 6
> > > #               NMI#: 27 time: 111379 ns
> > > #               Multiplexing#: 0 time: 0 ns
> > > #               SB#: 57 time: 90045 ns
> > > #
> > > # Samples: 26  of event 'cycles:u'
> > > # Event count (approx.): 1677531
> > > #
> > > # Overhead  Command  Shared Object     Symbol
> > > # ........  .......  ................  .......................
> > > #
> > >     24.20%  ls       ls                [.] _init
> > >     17.18%  ls       libc-2.24.so      [.] __strcoll_l
> > >     11.85%  ls       ld-2.24.so        [.] _dl_relocate_object
> > > ---
> 
> how about we display the overhead information same way the main perf output:
> 
>   CPU    NMI   NMI time    MTX  MTX time      SB   SB time
>   ...  .....   ........  .....  ........  ......  ........
>     6     27     111379      0         0      57     90045
> 
> 
> would be just matter of adding new sort objects

How would you connect those to hist entries then?  It'd be possible if
the sort key had 'cpu' only, no?

Thanks,
Namhyung