From: Peter Zijlstra <a.p.zijlstra@chello.nl>
To: Michael Holzheu <holzheu@linux.vnet.ibm.com>
Cc: 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: Fri, 19 Nov 2010 21:19:15 +0100 [thread overview]
Message-ID: <1290197955.2109.1617.camel@laptop> (raw)
In-Reply-To: <20101119201108.269346583@linux.vnet.ibm.com>
On Fri, 2010-11-19 at 21:11 +0100, Michael Holzheu wrote:
> 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.
Maybe this has been treated earlier in the threads and I missed it, but
the obvious solution doesn't get mentioned:
What would break if we violate this silly POSIX rule and account time of
childs regardless of SIGCHLD/SA_NOCLDWAIT?
next prev parent reply other threads:[~2010-11-19 20:19 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 ` Peter Zijlstra [this message]
2010-11-20 15:17 ` [patch 0/4] taskstats: Improve cumulative time accounting 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
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=1290197955.2109.1617.camel@laptop \
--to=a.p.zijlstra@chello.nl \
--cc=akpm@linux-foundation.org \
--cc=balbir@linux.vnet.ibm.com \
--cc=heiko.carstens@de.ibm.com \
--cc=holzheu@linux.vnet.ibm.com \
--cc=johnstul@us.ibm.com \
--cc=linux-kernel@vger.kernel.org \
--cc=linux-s390@vger.kernel.org \
--cc=nagar1234@in.ibm.com \
--cc=oleg@redhat.com \
--cc=roland@redhat.com \
--cc=schwidefsky@de.ibm.com \
--cc=tglx@linutronix.de \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is an external index of several public inboxes,
see mirroring instructions on how to clone and mirror
all data and code used by this external index.