Re: [RFC PATCH 9/9] powerpc: rewrite local_t using soft_irq

On Tuesday 26 July 2016 11:23 AM, Nicholas Piggin wrote:

On Mon, 25 Jul 2016 20:22:22 +0530
Madhavan Srinivasan [off-list ref] wrote:

quoted

https://lkml.org/lkml/2008/12/16/450

Modifications to Rusty's benchmark code:
  - Executed only local_t test

Here are the values with the patch.

Time in ns per iteration

Local_t		Without Patch		With Patch

_inc			28		8
_add			28		8
_read			3		3
_add_return		28		7

Tested the patch in a
  - pSeries LPAR (with perf record)

Very nice. I'd like to see these patches get in. We can
probably use the feature in other places too.

Thanks for review.

Maddy

Thanks,
Nick