linux-kernel - Re: [patch 0/4] taskstats: Improve cumulative time accounting

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Date:	Mon, 22 Nov 2010 13:11:34 -0500
From:	Valdis.Kletnieks@...edu
To:	holzheu@...ux.vnet.ibm.com
Cc:	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Oleg Nesterov <oleg@...hat.com>,
	Shailabh Nagar <nagar1234@...ibm.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	John stultz <johnstul@...ibm.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Balbir Singh <balbir@...ux.vnet.ibm.com>,
	Martin Schwidefsky <schwidefsky@...ibm.com>,
	Heiko Carstens <heiko.carstens@...ibm.com>,
	Roland McGrath <roland@...hat.com>,
	linux-kernel@...r.kernel.org, linux-s390@...r.kernel.org
Subject: Re: [patch 0/4] taskstats: Improve cumulative time accounting

On Mon, 22 Nov 2010 13:47:55 +0100, Michael Holzheu said:

> Currently the cumulative time accounting in Linux is not complete.
> Due to POSIX POSIX.1-2001, the CPU time of processes is not accounted
> to the cumulative time of the parents, if the parents ignore SIGCHLD
> or have set SA_NOCLDWAIT. This behaviour has the major drawback that
> it is not possible to calculate all consumed CPU time of a system by
> looking at the current tasks. CPU time can be lost.
> 
> This patch adds a new sysctl "kernel.full_cdata" that allows to switch
> between the POSIX behavior and complete cumulative accounting.

> +unsigned int full_cdata_enabled = 1;

This probably needs to default to "current kernel behavior" but allow
sysadmins to change to the new behavior.

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