Re: [PATCH RFC V2 3/5] jump_label: if a key has already been initialized,don't nop it out

From: H. Peter Anvin
Date: Thu Oct 06 2011 - 14:20:58 EST

On 10/06/2011 11:10 AM, Jason Baron wrote:
> It would be cool if we could make the total width 2-bytes, when
> possible. It might be possible by making the initial 'JUMP_LABEL_INITIAL_NOP'
> as a 'jmp' to the 'l_yes' label. And then patching that with a no-op at boot
> time or link time - letting the compiler pick the width. In that way we could
> get the optimal width...

Yes, that would be a win just based on icache footprint alone.


H. Peter Anvin, Intel Open Source Technology Center
I work for Intel. I don't speak on their behalf.

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