Re: [1/4] powerpc/64s: context switch leave interrupts hard enabled for radix
From: Michael Ellerman <hidden>
Date: 2017-06-19 12:25:38
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 <npiggin@gmail.com>Series applied to powerpc next, thanks. https://git.kernel.org/powerpc/c/e4c0fc5f72bca11432297168338aef cheers