Hi Jeremy, On Thu, Oct 05, 2017 at 05:12:44PM -0500, Jeremy Linton wrote: > On 10/05/2017 07:54 AM, Will Deacon wrote: > >This patch series reworks bits of the qrwlock code that it can be used > >to replace the asm rwlocks currently implemented for arm64. The structure > >of the series is: > > > > Patches 1-3 : Work WFE into qrwlock using atomic_cond_read_acquire > > so > > we can avoid busy-waiting. > > > > Patch 4 : Enable qrwlocks for arm64 > > > > Patch 5-6 : Ensure writer slowpath fairness. This has a potential > > performance impact on the writer unlock path, so I've > > kept them at the end. > > > >The patches apply on top of my other locking cleanups: > > > > > > http://lkml.kernel.org/r/1507055129-12300-1-git-send-email-will.dea...@arm.com > > > >although the conflict with mainline is trivial to resolve without those. > >The full stack is also pushed here: > > > > git://git.kernel.org/pub/scm/linux/kernel/git/will/linux.git qrwlock > > > >All comments (particularly related to testing and performance) welcome! > > I haven't done any perf testing, but the machines continue to boot, and the > stress-ng test which causes task lock problems with the normal arm64 rwlock > now appears to run as expected. So, its a good start!
Excellent! Mind if I add your tested-by? Will
