From: Michael Holzheu <holzheu@linux.vnet.ibm.com>
To: Oleg Nesterov <oleg@redhat.com>,
Shailabh Nagar <nagar1234@in.ibm.com>,
Andrew Morton <akpm@linux-foundation.org>,
Peter Zijlstra <a.p.zijlstra@chello.nl>,
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>
Cc: linux-kernel@vger.kernel.org, linux-s390@vger.kernel.org
Subject: [patch 0/4] taskstats: Improve cumulative time accounting
Date: Fri, 19 Nov 2010 21:11:08 +0100 [thread overview]
Message-ID: <20101119201108.269346583@linux.vnet.ibm.com> (raw)
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.
To solve this problem, this patch set duplicates the cumulative accounting
data in the signal_struct. In the second set (cdata_acct) the complete
cumulative resource counters are stored. The new cumulative CPU time (utime
and stime) is then exported via the taskstats interface.
PATCH SET OVERVIEW
------------------
Patches apply on:
git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux-2.6.git
[1] Introduce "struct cdata"
[2] Introduce __account_cdata() function
[3] Introduce cdata_acct for complete cumulative accounting
[4] Export "cdata_acct" with taskstats
next reply other threads:[~2010-11-19 20:11 UTC|newest]
Thread overview: 24+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-11-19 20:11 Michael Holzheu [this message]
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
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