linux-kernel - Re: [REGRESSION] Two issues that prevent process accounting (taskstats) from working correctly

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Message-ID: <20161219140202.GI3107@twins.programming.kicks-ass.net>
Date:   Mon, 19 Dec 2016 15:02:02 +0100
From:   Peter Zijlstra <peterz@...radead.org>
To:     Martin Steigerwald <martin@...htvoll.de>
Cc:     Martin Steigerwald <martin.steigerwald@...mix.de>,
        Ingo Molnar <mingo@...nel.org>, Andrew Morton <akpm@...l.org>,
        Ingo Molnar <mingo@...e.hu>,
        LKML <linux-kernel@...r.kernel.org>,
        Nicolas Dichtel <nicolas.dichtel@...nd.com>,
        Jay Lan <jlan@...r.sgi.com>,
        Gerlof Langeveld <gerlof.langeveld@...ptool.nl>,
        Marc Haber <mh+debian-packages@...schlus.de>,
        bsingharora@...il.com
Subject: Re: [REGRESSION] Two issues that prevent process accounting
 (taskstats) from working correctly

On Mon, Dec 19, 2016 at 02:50:25PM +0100, Martin Steigerwald wrote:
> Am Montag, 19. Dezember 2016, 14:19:11 CET schrieb Peter Zijlstra:
> > On Mon, Dec 19, 2016 at 01:06:00PM +0100, Martin Steigerwald wrote:
> > > Hello Ingo, Peter, Nicolas, Andrew, Balbir, Shailabh, Jay, Gerlof and
> > > Marc,
> > > 
> > > starting from a Debian bug report of mine, Gerlof Langeveld, developer of
> > > system and process monitor atop¹, found two issues with process
> > > accounting.
> > 
> > While $subject says regression the rest of the email completely fails to
> > mentions if this ever worked, and if so, against what version.
> 
> Sorry for not mentioning it here. With kernel 3.16 process accounting worked 
> nicely. We do not have any data on the exact kernel version where it started 
> to fail. I do see these issues since quite a while, but I was never sure 
> whether it was an issue in atop or the kernel and I do not recall on what 
> exact combination of atop + kernel version it failed to work.
> 
> As an additional notice: The mail addresses of Balbir and Shailabh which I got 
> from source code annotations of taskstats.c and getdelays.c do not work 
> anymore.

Right, Balbir is back with IBM and working on Linux again, but under a
different email address (and on a different continent). I've amended
his address and bounced him the initial email.