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SubjectRe: [RFC] Cancellable MCS spinlock rework
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On Thu, 2014-07-03 at 10:09 -0700, Davidlohr Bueso wrote:
> 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.

Right, especially if it could help things like xfs inode.



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