linux-kernel - Re: [RFC 00/10] perf: Add cputime events/metrics

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]

Message-ID: <6856997.NognPVqETE@milian-kdab2>
Date:   Wed, 26 Sep 2018 16:44:08 +0200
From:   Milian Wolff <milian.wolff@...b.com>
To:     Andi Kleen <andi@...stfloor.org>
Cc:     Jiri Olsa <jolsa@...nel.org>,
        Arnaldo Carvalho de Melo <acme@...nel.org>,
        Peter Zijlstra <a.p.zijlstra@...llo.nl>,
        lkml <linux-kernel@...r.kernel.org>,
        Ingo Molnar <mingo@...nel.org>,
        Namhyung Kim <namhyung@...nel.org>,
        David Ahern <dsahern@...il.com>,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        Stephane Eranian <eranian@...gle.com>,
        Frederic Weisbecker <frederic@...nel.org>
Subject: Re: [RFC 00/10] perf: Add cputime events/metrics

On Thursday, June 7, 2018 1:10:18 AM CEST Andi Kleen wrote:
> > I had some issues with IDLE counter being miscounted due to stopping
> > of the idle tick. I tried to solve it in this patch (it's part of the
> > 
> > patchset):
> >   perf/cputime: Don't stop idle tick if there's live cputime event
> > 
> > but I'm pretty sure it's wrong and there's better solution.
> 
> At least on intel we already have hardware counters for different idle
> states. You just would need to add them and convert to the same
> unit.
> 
> But of course it's still useful when this is not available.
> 
> > My current plan is now to read those counters in perf top/record/report
> > to show (at least) the idle percentage for the current profile.
> 
> It's useful. Thanks for working on it. I was thinking about doing
> something similar for some time.

Hey Jiri,

what happened to this patch series? I also believe it's super useful, even 
when it's not yet perfect.

Thanks

-- 
Milian Wolff | milian.wolff@...b.com | Senior Software Engineer
KDAB (Deutschland) GmbH, a KDAB Group company
Tel: +49-30-521325470
KDAB - The Qt, C++ and OpenGL Experts
Download attachment "smime.p7s" of type "application/pkcs7-signature" (3826 bytes)