linux-kernel - Re: [PATCH] cpuacct: add a branch prediction

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Message-Id: <200902261340.57353.arnd@arndb.de>
Date:	Thu, 26 Feb 2009 13:40:56 +0100
From:	Arnd Bergmann <arnd@...db.de>
To:	Ingo Molnar <mingo@...e.hu>
Cc:	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>,
	Bharata B Rao <bharata.rao@...il.com>,
	Li Zefan <lizf@...fujitsu.com>,
	Paul Menage <menage@...gle.com>,
	Balbir Singh <balbir@...ux.vnet.ibm.com>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] cpuacct: add a branch prediction

On Thursday 26 February 2009, Ingo Molnar wrote:
>
> > Yeah, atomic64_t has been proposed numerous times, and x86 
> > could actually implement that using cmpxchg8b, just not sure 
> > about all the other 32bit archs, and if we start using it in 
> > the scheduler, they'd better have it implemented.
> 
> I have written a working atomic64_t implementation for 
> tip:perfcounters/core, for 32-bit x86.

It should also be possible to write an asm-generic atomic64_t
implementation based on the parisc atomic_t hashlock code.
For non-SMP configurations, it falls back on local_irq_save(),
which is already the method used for atomic_t on half the
embedded architectures.

	Arnd <><
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