From: Valdis.Kletnieks@vt.edu
To: holzheu@linux.vnet.ibm.com
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>,
Oleg Nesterov <oleg@redhat.com>,
Shailabh Nagar <nagar1234@in.ibm.com>,
Andrew Morton <akpm@linux-foundation.org>,
John stultz <johnstul@us.ibm.com>,
Thomas Gleixner <tglx@linutronix.de>,
Balbir Singh <balbir@linux.vnet.ibm.com>,
Martin Schwidefsky <schwidefsky@de.ibm.com>,
Heiko Carstens <heiko.carstens@de.ibm.com>,
Roland McGrath <roland@redhat.com>,
linux-kernel@vger.kernel.org, linux-s390@vger.kernel.org
Subject: Re: [patch 0/4] taskstats: Improve cumulative time accounting
Date: Mon, 22 Nov 2010 13:11:34 -0500 [thread overview]
Message-ID: <9359.1290449494@localhost> (raw)
In-Reply-To: Your message of "Mon, 22 Nov 2010 13:47:55 +0100." <1290430075.5655.3.camel@holzheu-laptop>
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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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prev parent reply other threads:[~2010-11-22 18:11 UTC|newest]
Thread overview: 24+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-11-19 20:11 [patch 0/4] taskstats: Improve cumulative time accounting Michael Holzheu
2010-11-19 20:11 ` [patch 1/4] taskstats: Introduce "struct cdata" Michael Holzheu
2010-11-25 12:29 ` Balbir Singh
2010-11-25 14:23 ` Oleg Nesterov
2010-11-25 16:38 ` Michael Holzheu
2010-11-19 20:11 ` [patch 2/4] taskstats: Introduce __account_cdata() function Michael Holzheu
2010-11-19 20:11 ` [patch 3/4] taskstats: Introduce cdata_acct for complete cumulative accounting Michael Holzheu
2010-11-23 16:59 ` Oleg Nesterov
2010-11-25 9:40 ` Michael Holzheu
2010-11-25 13:21 ` Oleg Nesterov
2010-11-25 17:45 ` Michael Holzheu
2010-11-19 20:11 ` [patch 4/4] taskstats: Export "cdata_acct" with taskstats Michael Holzheu
2010-11-25 13:26 ` Oleg Nesterov
2010-11-25 17:21 ` Michael Holzheu
2010-11-29 16:43 ` Oleg Nesterov
2010-11-29 16:58 ` Michael Holzheu
2010-11-29 18:08 ` Oleg Nesterov
2010-11-25 16:57 ` Balbir Singh
2010-11-19 20:19 ` [patch 0/4] taskstats: Improve cumulative time accounting Peter Zijlstra
2010-11-20 15:17 ` Oleg Nesterov
2010-11-22 7:21 ` Balbir Singh
2010-11-22 11:03 ` Michael Holzheu
2010-11-22 12:47 ` Michael Holzheu
2010-11-22 18:11 ` Valdis.Kletnieks [this message]
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