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    SubjectRe: [PATCH][RESEND] scalable rw_mutex
    Q: Were do I find info about this thing called top-posting?
    A: Because it messes up the order in which people normally read text.
    Q: Why is top-posting such a bad thing?

    On Fri, 2008-08-08 at 10:04 -0400, Ryan Hope wrote:
    > Sorry for not CCing you, I had intended to CC you and others but I
    > clicked send too quick. One of the reiser4 todo's was remove all
    > semaphore's, I didnt realize rw_semaphores were not real semaphores

    Yeah, more people make that mistake. They're basically a sleeping rw
    lock and already conform to the semantics that are required for lockdep
    and are thus also already covered by lockdep.

    > On Fri, Aug 8, 2008 at 6:21 AM, Peter Zijlstra <> wrote:
    > > On Thu, 2008-08-07 at 18:56 -0400, Ryan Hope wrote:
    > >> This was posted sometime last year I think and it never got merged. Can this get
    > >> a go around in -mm, it would help in converting the semaphore's in reiser4 to
    > >> mutexes.
    > >
    > > Thanks for CC'ing me :-/
    > >
    > > I dropped it because its only more scalable up to around 4 cpus.
    > >
    > > Also, how would it help reiser4? using rwsems is perfectly fine - as
    > > they aren't actual semaphores.

    <snip code>

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