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:   Thu, 24 Nov 2016 16:21:17 -0800
From:   Andi Kleen <andi@...stfloor.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>,
        "namhyung@...nel.org" <namhyung@...nel.org>,
        "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

> 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

The problem with making overhead a standard sort key is that you have
to chose between an output format that makes sense for overhead
and one that makes sense for normal samples.

But overhead is more "auxillary" information, so it should be possible
to access it together with normal sampling information in a single
output file.

So I think it's better handled separately.

-Andi