linux-kernel - Re: [PATCH] Restore deterministic CPU accounting on powerpc

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Message-ID: <472CA62D.8050205@linux.vnet.ibm.com>
Date:	Sat, 03 Nov 2007 22:17:41 +0530
From:	Balbir Singh <balbir@...ux.vnet.ibm.com>
To:	Paul Mackerras <paulus@...ba.org>
CC:	Ingo Molnar <mingo@...e.hu>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Thomas Gleixner <tglx@...utronix.de>,
	Martin Schwidefsky <schwidefsky@...ibm.com>,
	Christian Borntraeger <borntraeger@...ibm.com>,
	linux-kernel@...r.kernel.org, linuxppc-dev@...abs.org
Subject: Re: [PATCH] Restore deterministic CPU accounting on powerpc

Paul Mackerras wrote:
> Balbir Singh writes:
> 
>> So, scaled accounting will not be available if
>> CONFIG_VIRT_CPU_ACCOUNTING is defined? Am I reading this correctly
> 
> No, what makes you think that?  If VIRT_CPU_ACCOUNTING=y it is the
> responsibility of the arch's account_process_tick to update the scaled
> stats.  And the powerpc version does that by calling
> account_user_time_scaled().
> 
> Paul.

I looked at the diff's and could just see the reversal of scaled
accounting. I looked at account_process_vtime(), now
account_process_tick() and things seem fine. I was mislead by the
diff.

-- 
	Warm Regards,
	Balbir Singh
	Linux Technology Center
	IBM, ISTL
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