From: "Paul E. McKenney" <paulmck@linux.vnet.ibm.com>
To: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Ingo Molnar <mingo@kernel.org>,
"Eric W. Biederman" <ebiederm@xmission.com>,
Tejun Heo <tj@kernel.org>, Jann Horn <jannh@google.com>,
Benjamin LaHaise <bcrl@kvack.org>,
Al Viro <viro@zeniv.linux.org.uk>,
Thomas Gleixner <tglx@linutronix.de>,
Peter Zijlstra <a.p.zijlstra@chello.nl>,
Linux Kernel Mailing List <linux-kernel@vger.kernel.org>
Subject: Re: Simplifying our RCU models
Date: Wed, 27 Jun 2018 15:28:35 -0700 [thread overview]
Message-ID: <20180627222835.GA9656@linux.vnet.ibm.com> (raw)
In-Reply-To: <20180608165134.GA28693@linux.vnet.ibm.com>
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
next prev parent reply other threads:[~2018-06-27 22:26 UTC|newest]
Thread overview: 17+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <CAG48ez17vOL0oEWqoqdHCjqfGVX+aPhHBrtgCfn35z6jZ=8-Xg@mail.gmail.com>
[not found] ` <CA+55aFzQPQw2UqQ2EEGN1Xe7=qDs-2VTvHVi7SSqGNwqNRg0cQ@mail.gmail.com>
[not found] ` <CAOS58YPzLeiZnwEeN31wWMZhki0t9+3ozdRNv9DgxWKY7OKmGA@mail.gmail.com>
[not found] ` <CA+55aFx48U4W5tUgqW9ioZOHibPhQoDCUDWF_d-7yNCbqFQ7zg@mail.gmail.com>
[not found] ` <20180305001600.GO3918@linux.vnet.ibm.com>
[not found] ` <CA+55aFyOi1XnSqHtg=VfcUiBL+egNL==NRX1Zaeihe8W5OJVgw@mail.gmail.com>
[not found] ` <20180305030949.GP3918@linux.vnet.ibm.com>
[not found] ` <20180305082441.4hao2z4dqn2n5on6@gmail.com>
2018-03-05 14:33 ` Simplifying our RCU models Eric W. Biederman
2018-03-05 16:14 ` Paul E. McKenney
2018-03-06 8:47 ` Ingo Molnar
2018-03-06 9:00 ` Ingo Molnar
2018-03-06 21:06 ` Paul E. McKenney
2018-03-06 20:39 ` Paul E. McKenney
2018-03-07 15:54 ` Paul E. McKenney
2018-03-07 18:48 ` Linus Torvalds
2018-03-08 20:45 ` Paul E. McKenney
2018-04-10 23:44 ` Paul E. McKenney
2018-06-08 16:51 ` Paul E. McKenney
2018-06-27 22:28 ` Paul E. McKenney [this message]
2018-08-29 21:47 ` Paul E. McKenney
2018-03-08 21:19 ` Andrea Parri
[not found] ` <20180309005145.GZ3918@linux.vnet.ibm.com>
[not found] ` <20180309095520.GA5079@andrea>
[not found] ` <20180310160409.GF3918@linux.vnet.ibm.com>
[not found] ` <20180310162946.GA7548@andrea>
[not found] ` <20180310224726.GI3918@linux.vnet.ibm.com>
2018-03-10 23:36 ` Andrea Parri
2018-03-09 9:48 ` Lai Jiangshan
2018-03-10 16:06 ` Paul E. McKenney
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