From: Martin Schwidefsky <schwidefsky@de.ibm.com>
To: Peter Zijlstra <peterz@infradead.org>
Cc: Ingo Molnar <mingo@elte.hu>,
Stephen Rothwell <sfr@canb.auug.org.au>,
Thomas Gleixner <tglx@linutronix.de>,
"H. Peter Anvin" <hpa@zytor.com>,
linux-next@vger.kernel.org, linux-kernel@vger.kernel.org,
Glauber Costa <glommer@parallels.com>
Subject: Re: linux-next: manual merge of the tip tree with the cputime tree
Date: Mon, 19 Dec 2011 15:25:19 +0100 [thread overview]
Message-ID: <20111219152519.252b75eb@de.ibm.com> (raw)
In-Reply-To: <1324303723.24621.1.camel@twins>
On Mon, 19 Dec 2011 15:08:43 +0100
Peter Zijlstra <peterz@infradead.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.
next prev parent reply other threads:[~2011-12-19 14:25 UTC|newest]
Thread overview: 23+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-12-19 4:40 linux-next: manual merge of the tip tree with the cputime tree Stephen Rothwell
2011-12-19 8:08 ` Ingo Molnar
2011-12-19 9:11 ` Martin Schwidefsky
2011-12-19 10:35 ` Ingo Molnar
2011-12-19 11:25 ` Ingo Molnar
2011-12-19 14:24 ` Martin Schwidefsky
2011-12-19 16:30 ` Ingo Molnar
2011-12-19 19:06 ` Martin Schwidefsky
2011-12-20 11:09 ` Ingo Molnar
2011-12-19 12:31 ` Martin Schwidefsky
2011-12-19 13:43 ` Glauber Costa
2011-12-19 14:19 ` Martin Schwidefsky
2011-12-19 14:08 ` Peter Zijlstra
2011-12-19 14:25 ` Martin Schwidefsky [this message]
2011-12-20 10:19 ` Glauber Costa
-- strict thread matches above, loose matches on Subject: below --
2011-12-07 4:09 Stephen Rothwell
2011-12-07 11:35 ` Glauber Costa
2011-12-07 11:59 ` Martin Schwidefsky
2011-10-25 7:44 Stephen Rothwell
2011-10-25 7:40 Stephen Rothwell
2011-10-25 15:29 ` Michal Hocko
2011-10-25 7:35 Stephen Rothwell
2011-10-25 15:28 ` Michal Hocko
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