linux-kernel - Re: [PATCH] taskstats: Use real microsecond granularity for CPU times

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Message-Id: <20101011125715.62001452.akpm@linux-foundation.org>
Date:	Mon, 11 Oct 2010 12:57:15 -0700
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	holzheu@...ux.vnet.ibm.com
Cc:	Luck Tony <tony.luck@...el.com>, benh@...nel.crashing.org,
	Balbir Singh <balbir@...ux.vnet.ibm.com>,
	Shailabh Nagar <nagar1234@...ibm.com>,
	Martin Schwidefsky <schwidefsky@...ibm.com>,
	linux-kernel@...r.kernel.org, Oleg Nesterov <oleg@...hat.com>
Subject: Re: [PATCH] taskstats: Use real microsecond granularity for CPU
 times

On Mon, 11 Oct 2010 09:26:44 +0200
Michael Holzheu <holzheu@...ux.vnet.ibm.com> wrote:

> The taskstats interface uses microsecond granularity for the user and
> system time values. The conversion from cputime to the taskstats values
> uses the cputime_to_msecs primitive which effectively limits the 
> granularity to milliseconds. Add the cputime_to_usecs primitive for
> architectures that have better, more precise CPU time values. Remove
> cputime_to_msecs primitive because there is no more user left.

Fair enough.

msecs_to_cputime() never had any callers, and it replacement
usecs_to_cputime() doesn't have any callers either.  Maybe we should
just zap it.


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