Messages in this thread | | | Date | Wed, 27 Jun 2018 15:28:35 -0700 | From | "Paul E. McKenney" <> | Subject | Re: Simplifying our RCU models |
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On Fri, Jun 08, 2018 at 09:51:34AM -0700, Paul E. McKenney wrote: > On Tue, Apr 10, 2018 at 04:44:25PM -0700, Paul E. McKenney wrote: > > On Thu, Mar 08, 2018 at 12:45:24PM -0800, Paul E. McKenney wrote: > > > On Wed, Mar 07, 2018 at 10:48:50AM -0800, Linus Torvalds wrote: > > > > On Wed, Mar 7, 2018 at 7:54 AM, Paul E. McKenney > > > > <paulmck@linux.vnet.ibm.com> wrote: > > > > > > > > > > Ah, and any thoughts on how best to get feedback from the various people > > > > > who would need to reprogram their fingers? Or is everyone already on > > > > > board with changing these various names? > > > > > > > > I really would prefer to not see massive re-naming unless there is a > > > > really good reason for it. > > > > > > > > I'm all for simplifying RCU from a million different versions down to > > > > just a few thousand, but I'm definitely not convinced we want to do > > > > any search-and-replace. > > > > > > I am currently in the design (more accurately, reredesign phase) for > > > the simplification. It is quite possible that there is a good reason > > > for at least some renaming, but in that case, I would come back later > > > with that as a separate proposal. > > > > And I really am still working on this. It is a bit tricky, but still > > looks doable. More likely to be ready for 4.19 than 4.18, though. > > I suppose it is well past time for an update... > > I believe I have the preparation work done (famous last words!), and I am > now working on making rcutorture properly test the resulting compound RCU > read-side critical sections. User-level testing might be necessary (and > has been for some of the preparatory work). The ink-on-paper prototype > is starting to look promising, and I expect to get the corresponding > prototype patch posted by the end of this month. > > A bit trickier than I expected (as usual), but still looking doable.
And it now passes light rcutorture testing, so I have posted an RFC series to LKML:
lkml.kernel.org/r/20180627204835.GA25456@linux.vnet.ibm.com
There will be a long series of cleanups that will remove the other flavors and also the code that supports multiple flavors, but there are probably quite a few bugs to fix in this particular patch between now and then. ;-)
Thanx, Paul
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