Re: [RFC][PATCH RT] rwsem_rt: Another (more sane) approach to mulitreader rt locks

[Paul E. McKenney]

On Thu, May 17, 2012 at 05:32:59PM +0200, Peter Zijlstra wrote:
> On Thu, 2012-05-17 at 08:18 -0700, Paul E. McKenney wrote:
> > Some researchers at MIT RCU-ified this lock:
> > 
> > http://people.csail.mit.edu/nickolai/papers/clements-bonsai.pdf 
> 
> Ah, as have I [1].. and they seem to have gotten about as far as I have,
> which means almost there but not quite [2] :-)

I had forgotten about that -- that was the first call for call_srcu(),
if I remember correctly.

> The most interesting case is file maps and they simply ignored those.
> While I appreciate that from an academic pov, -- they can still write a
> paper on the other interesting bits -- I don't really like it from a
> practical point.
> 
> [1] https://lkml.org/lkml/2010/1/4/257
> [2] https://lkml.org/lkml/2010/1/4/532

Hmmm...  Do the recent dcache changes cover some of the things that
Linus called out?  Probably not, but some at least.

							Thanx, Paul

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