linux-kernel - Re: [RFC][PATCH 09/10] taskstats: Fix exit CPU time accounting

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Message-Id: <20100929191916.21E1840038@magilla.sf.frob.com>
Date:	Wed, 29 Sep 2010 12:19:16 -0700 (PDT)
From:	Roland McGrath <roland@...hat.com>
To:	Oleg Nesterov <oleg@...hat.com>
Cc:	Martin Schwidefsky <schwidefsky@...ibm.com>,
	Michael Holzheu <holzheu@...ux.vnet.ibm.com>,
	Shailabh Nagar <nagar1234@...ibm.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Venkatesh Pallipadi <venki@...gle.com>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Suresh Siddha <suresh.b.siddha@...el.com>,
	John stultz <johnstul@...ibm.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Balbir Singh <balbir@...ux.vnet.ibm.com>,
	Ingo Molnar <mingo@...e.hu>,
	Heiko Carstens <heiko.carstens@...ibm.com>,
	linux-s390@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [RFC][PATCH 09/10] taskstats: Fix exit CPU time accounting

> > I would consider it to be a BUG() that the time is not accounted.
> > Independent of the fact that a parent wants to see the SIGCHLD and
> > the exit status of its child the process time of the child should be
> > accounted, no?
> 
> I do not know. It doesn't look like a BUG(), I mean it looks as if
> the code was intentionally written this way.

POSIX specifies this behavior: "If the child is never waited for (for
example, if the parent has SA_NOCLDWAIT set or sets SIGCHLD to SIG_IGN),
the resource information for the child process is discarded and not
included in the resource information provided by getrusage()."


Thanks,
Roland
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