Messages in this thread | | | Date | Mon, 14 May 2018 09:09:07 -0700 | From | "Paul E. McKenney" <> | Subject | Re: [PATCH tip/core/rcu 0/21] Contention reduction for v4.18 |
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On Mon, May 14, 2018 at 04:42:33PM +1000, Nicholas Piggin wrote: > On Sun, 22 Apr 2018 20:02:58 -0700 > "Paul E. McKenney" <paulmck@linux.vnet.ibm.com> wrote: > > > Hello! > > > > This series reduces lock contention on the root rcu_node structure, > > and is also the first precursor to TBD changes to consolidate the > > three RCU flavors (RCU-bh, RCU-preempt, and RCU-sched) into one. > > Hi Paul, > > I've been running your rcu/dev branch and haven't noticed any problems > yet. The irqsoff latency improvement is a little hard to measure > because the scheduler, but I've tried turning balancing parameters > right down and I'm yet to see any sign of RCU in traces (down to about > 100us on a 176 CPU machine), so that's great.
Good to hear!!!
> (Not that RCU was ever the worst contributor to latency as I said, just > that I noticed those couple of traces where it showed up.) > > Thanks very much for the fast response, sorry I've taken a while to > test.
Would you be willing to give me a Tested-by on that series of patches?
Thanx, Paul
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