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    SubjectRe: [PATCH RFC] big reader semaphore take#2
    Tejun Heo wrote:
    > Nick Piggin wrote:

    >> The upshot of that would be that you could build the whole thing
    >> from rwsem infrastructure and have basically zero other locking
    >> mechanisms or complexity that you don't want in a synchronisation
    >> primitive.
    >>
    >
    > To certain extent, I do agree with you - it's safer/simpler..., but on
    > the other hand, new brsem isn't that more complex and would perform
    > almost identically without extra semantical baggage. So, I thought it
    > might be worth a bit more effort.
    >

    I would do it thisway if possible, yes.

    > Hmm... So, array of rwsem's, it should be.
    >

    First implementation would be per-cpu just rwsems. A second patch
    to make it just an array rwsem->count's plus a shared queue may
    be in order - OTOH everyone does their own rwsems, so this will be
    a bit of a headache.

    I forget - are you just planning to use one global brsem? In this
    case the size issue wouldn't be a pressing one.

    --
    SUSE Labs, Novell Inc.

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