* Ingo Molnar <mi...@kernel.org> wrote:
> > * Waiman Long <long...@redhat.com> wrote: > > > On 04/18/2019 07:46 PM, Waiman Long wrote: > > > v5: > > > - Drop v4 patch 1 as it is merged into tip's locking/core branch. > > > - Integrate the 2 followup patches into the series. The first > > > follow-up patch is broken into 2 pieces. The first piece comes in > > > before the "Enable readers spinning on writer" and the 2nd piece > > > is merged into the "Enable time-based spinning on reader-owned > > > rwsem" patch. The 2nd followup patch is added after that. > > > - Add a new patch to make all wake_up_q() calls after dropping > > > wait_lock as suggested by PeterZ. > > > - Incorporate numerouos suggestions by PeterZ and Davidlohr. > > > > This patchset is still being reviewed by Peter . The purpose of this > > series is mainly to sync up the version that Peter has and the ones that > > I am working on incorporating his feedback. Further changes may still be > > needed. > > > > I run an overall performance test on this new patchset and present the > > data in this cover letter. However, I haven't run performance tests for > > individual patches. So the performance data listed in some of the > > patches may be stale. > > Just for those who'd like to follow the scope of changes, find below the > v4->v5 interdiff. v5 is now included in tip:WIP.locking/core, and also > merged into tip:master. (But not propagated towards linux-next yet.) Hm, I'm experiencing early boot hangs with v5, on defconfig-ish x86-64 kernels: [ 0.153940] rcu: Hierarchical RCU implementation. [ 0.154289] rcu: RCU restricting CPUs from NR_CPUS=128 to nr_cpu_ids=17. [ 0.154829] rcu: RCU calculated value of scheduler-enlistment delay is 100 jiffies. [ 0.155390] rcu: Adjusting geometry for rcu_fanout_leaf=16, nr_cpu_ids=17 I bisected it back to the v5 version of this patch: 2fd5f60fa4c3: locking/rwsem: Merge owner into count on x86-64 I'm moving -tip back to -v4 meanwhile. Thanks, Ingo