[dm-devel] RCU-ified dm-mpath for testing/review

[Mike Snitzer]

On Tue, Feb 09 2016 at  7:45pm -0500,
Mike Snitzer <snitzer at redhat.com> wrote:

> 
> OK, I took a crack at embracing RCU.  Only slightly better performance
> on my single NUMA node testbed.  (But I'll have to track down a system
> with multiple NUMA nodes to do any justice to the next wave of this
> optimization effort)
> 
> This RCU work is very heavy-handed and way too fiddley (there could
> easily be bugs).  Anyway, please see:
> http://git.kernel.org/cgit/linux/kernel/git/snitzer/linux.git/commit/?h=devel2&id=d80a7e4f8b5be9c81e4d452137623b003fa64745
> 
> But this might give you something to build on to arrive at something
> more scalable?

I've a bit more polished version of this work (broken up into multiple
commits, with some fixes, etc) here:
http://git.kernel.org/cgit/linux/kernel/git/snitzer/linux.git/log/?h=devel3

Hannes and/or Sagi, if you get a chance to try this on your NUMA system
please let me know how it goes.

Mike