Re: [PATCH-tip 0/2] locking/rwsem: Rwsem rearchitecture part 2 follow-up patches

[Peter Zijlstra]

On Tue, Apr 16, 2019 at 09:18:50AM -0400, Waiman Long wrote:
> On 04/16/2019 09:10 AM, Peter Zijlstra wrote:
> > On Mon, Apr 15, 2019 at 04:58:27PM -0400, Waiman Long wrote:
> >> This series contain 2 follow-up patches to alleviate the performance
> >> regression found in the page_fault1 test of the will-it-scale benchmark.
> >> This does not recover all the lost performance, but reclaim a sizeable
> >> portion of it.
> >>
> >> The regression was found on an Intel system. I have run the test on
> >> an AMD system. The regression wasn't seen there.  There are only minor
> >> variations in performance. Perhaps the page fault path is quite different
> >> between Intel and AMD systems.
> > Can you please just fold this back into the appropriate patches? Trying
> > to review all the back and forth is painful.
> 
> I will send out an update part 2 patch with patch 1 of this series
> merged into the writer spinning on reader patch. Patch 2 of this series
> will be a standalone one.

Hmm, in that case I can fold it back too. So hold off on sending it.

I thought #2 was a fixup for an earlier patch as well.