Re: [PATCH] cpuacct: add a branch prediction

[Arnd Bergmann]

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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