Re: [RFC] Cancellable MCS spinlock rework

[Jason Low]

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.

--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/