On Wed, Jul 08, 2020 at 07:54:34PM -0400, Waiman Long wrote:

On 7/8/20 4:41 AM, Peter Zijlstra wrote:

quoted

On Tue, Jul 07, 2020 at 03:57:06PM +1000, Nicholas Piggin wrote:

quoted

Yes, powerpc could certainly get more performance out of the slow
paths, and then there are a few parameters to tune.

Can you clarify? The slow path is already in use on ARM64 which is weak,
so I doubt there's superfluous serialization present. And Will spend a
fair amount of time on making that thing guarantee forward progressm, so
there just isn't too much room to play.

quoted

We don't have a good alternate patching for function calls yet, but
that would be something to do for native vs pv.

Going by your jump_label implementation, support for static_call should
be fairly straight forward too, no?

   https://lkml.kernel.org/r/20200624153024.794671356@infradead.org

Speaking of static_call, I am also looking forward to it. Do you have an
idea when that will be merged?

0day had one crash on the last round, I think Steve send a fix for that
last night and I'll go look at it.

That said, the last posting got 0 feedback, so either everybody is
really happy with it, or not interested. So let us know in the thread,
with some review feedback.

Once I get through enough of the inbox to actually find the fix and test
it, I'll also update the thread, and maybe threaten to merge it if
everybody stays silent :-)