Re: [RFC] Cancellable MCS spinlock rework

[Davidlohr Bueso]

On Thu, 2014-07-03 at 09:31 +0200, Peter Zijlstra wrote:
> On Wed, Jul 02, 2014 at 10:30:03AM -0700, Jason Low wrote:
> > Would potentially reducing the size of the rw semaphore structure by 32
> > bits (for all architectures using optimistic spinning) be a nice
> > benefit?
> 
> Possibly, although I had a look at the mutex structure and we didn't
> have a hole to place it in, unlike what you found with the rwsem.

Yeah, and currently struct rw_semaphore is the largest lock we have in
the kernel. Shaving off space is definitely welcome.

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