linux-kernel - Re: [RFC][PATCH v2 5/7] taskstats: Improve cumulative CPU time accounting

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Message-ID: <20101118163435.GA3249@redhat.com>
Date:	Thu, 18 Nov 2010 17:34:35 +0100
From:	Oleg Nesterov <oleg@...hat.com>
To:	Michael Holzheu <holzheu@...ux.vnet.ibm.com>
Cc:	Shailabh Nagar <nagar1234@...ibm.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Venkatesh Pallipadi <venki@...gle.com>,
	Suresh Siddha <suresh.b.siddha@...el.com>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Ingo Molnar <mingo@...e.hu>, 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: [RFC][PATCH v2 5/7] taskstats: Improve cumulative CPU time
	accounting

On 11/16, Michael Holzheu wrote:
>
> On Sat, 2010-11-13 at 19:38 +0100, Oleg Nesterov wrote:
> > I already asked you to split these changes, perhaps you can do this?
> > Say, bacct_add_tsk() looks overcomplicated, the change in copy_process()
> > shouldn't introduce the new CLONE_THREAD check, not sure I understand
> > why release_task() was chosen for reparenting, other nits...
>
> I want to establish the new hierarchy when a new process is forked and
> not for new threads, therefore the check for CLONE_THREAD in
> copy_process().

Yes, but copy_process() already checks CLONE_THREAD many times. No
need to introduce the new check.

> I do the reparenting with reparent_acct() when a process
> dies, therefore the check for "group_dead" in exit_signal().

And it is not clear to me why release_task() is better than
exit_notify().


That said, perhaps I'll understand this reading the next version.
That is why I asked to split.

Oleg.

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