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Subject: Re: [RFC][PATCH v2 4/7] taskstats: Add per task steal time
 accounting
From: Peter Zijlstra <a.p.zijlstra@chello.nl>
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Date: Mon, 15 Nov 2010 18:47:09 +0100
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To: Martin Schwidefsky <schwidefsky@de.ibm.com>
Cc: Michael Holzheu <holzheu@linux.vnet.ibm.com>, Shailabh Nagar <nagar1234@in.ibm.com>, Andrew Morton <akpm@linux-foundation.org>, Venkatesh Pallipadi <venki@google.com>, Suresh Siddha <suresh.b.siddha@intel.com>, Ingo Molnar <mingo@elte.hu>, Oleg Nesterov <oleg@redhat.com>, John stultz <johnstul@us.ibm.com>, Thomas Gleixner <tglx@linutronix.de>, Balbir Singh <balbir@linux.vnet.ibm.com>, Heiko Carstens <heiko.carstens@de.ibm.com>, Roland McGrath <roland@redhat.com>, linux-kernel@vger.kernel.org, linux-s390@vger.kernel.org, "jeremy.fitzhardinge" <jeremy.fitzhardinge@citrix.com>
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On Mon, 2010-11-15 at 18:42 +0100, Martin Schwidefsky wrote:
> There are 40 bytes more in the task structure and a few instructions more
> in account_steal_time. I would not call that gazillions wasted bytes and
> cycles. 

Taken over all machines running Linux on real hardware that's gobs of
memory wasted and lots of cycles spend adding 0s.