linux-kernel - Re: linux-next: manual merge of the tip tree with the cputime tree

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Message-ID: <20111219152519.252b75eb@de.ibm.com>
Date:	Mon, 19 Dec 2011 15:25:19 +0100
From:	Martin Schwidefsky <schwidefsky@...ibm.com>
To:	Peter Zijlstra <peterz@...radead.org>
Cc:	Ingo Molnar <mingo@...e.hu>,
	Stephen Rothwell <sfr@...b.auug.org.au>,
	Thomas Gleixner <tglx@...utronix.de>,
	"H. Peter Anvin" <hpa@...or.com>, linux-next@...r.kernel.org,
	linux-kernel@...r.kernel.org, Glauber Costa <glommer@...allels.com>
Subject: Re: linux-next: manual merge of the tip tree with the cputime tree

On Mon, 19 Dec 2011 15:08:43 +0100
Peter Zijlstra <peterz@...radead.org> wrote:

> On Mon, 2011-12-19 at 13:31 +0100, Martin Schwidefsky wrote:
> > Just one question: are you sure that you want the cpustat array
> > to be u64 instead of cputime64_t? The content of the cpustat array is defined
> > by the architecture semantics of cputime64_t, for CONFIG_VIRT_CPU_ACCOUNTING=y
> > this is not a jiffy counter. If the array is u64 we won't get the sparse
> > checking when reading from cpustat. 
> 
> So as Glauber said the reason was that we wanted to use simply
> operators, and IIRC he wanted to add a few fields that had to be u64.
> 
> I'm not sure what the current plans are wrt adding more fields, but with
> your work cputime_t should again be a simple type and thus regular math
> operators should work again, right?

Correct.

-- 
blue skies,
   Martin.

"Reality continues to ruin my life." - Calvin.

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