Re: [RFC PATCH 1/1] prefetch result in 64 bit atomic ops

[Will Deacon]

Hi Pranith,

On Mon, Apr 14, 2014 at 07:45:22PM +0100, Pranith Kumar wrote:
> Please disregard previous patches. This is the correct one. 
> 
> prefetch destination as is being done in ARM32 atomic ops

Whilst this looks like a potentially sensible optimisation (based on the
results I saw on AArch32), I don't think we can take this patch without some
benchmarks on real silicon. The interaction between the half-barrier atomic
instructions and prfm isn't immediately obvious to me, and we should also
consider looking at streaming preload vs the l1keep option.

Did you write this patch as a basic port of the arch/arm/ patches I wrote,
or was it based on performance figures from real hardware?

Will
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