Subject: Re: [1/4] powerpc/64s: context switch leave interrupts hard enabled for radix

From: Michael Ellerman <[email-masked]>
Date: Mon, 19 Jun 2017 22:25:37 +1000 (AEST)

On Thu, 2017-06-08 at 15:36:06 UTC, Nicholas Piggin wrote:
> Commit 4387e9ff25 ("[POWERPC] Fix PMU + soft interrupt disable bug")
> hard disabled interrupts over the low level context switch, because
> the SLB management can't cope with a PMU interrupt accesing the stack
> in that window.
> 
> Radix based kernel mapping does not use the SLB so it does not require
> interrupts hard disabled here.
> 
> This is worth 1-2% in context switch performance on POWER9.
> 
> Signed-off-by: Nicholas Piggin <[email-masked]>

Series applied to powerpc next, thanks.

https://git.kernel.org/powerpc/c/e4c0fc5f72bca11432297168338aef

cheers