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    FromRusty Russell <>
    SubjectRe: [Lse-tech] Re: RFC: patch to allow lock-free traversal of lists with insertion
    DateSun, 14 Oct 2001 06:44:23 +1000
    In message <k23d4njs9x.fsf@zero.aec.at> you write:
    > In article <Pine.LNX.4.33.0110131015410.8707-100000@penguin.transmeta.com>,
    > Linus Torvalds <torvalds@transmeta.com> writes:
    > 
    > >  - nobody has shown a case where existing normal locking ends up being
    > >    really a huge problem, and where RCU clearly helps.
    > 
    > The poster child of such a case is module unloading. Keeping reference
    > counts for every even non sleeping use of a module is very painful. 
    
    Well, module unloading requires only a small fraction of the read copy
    update infrastructure (synchronize_kernel()), and can be implemented
    without any scheduler changes, as it's not at all speed critical.
    
    If nothing else, this thread has served to make more kernel hackers
    aware of the technique, so they can try it themselves as desired.
    
    Cheers,
    Rusty.
    --
    Premature optmztion is rt of all evl. --DK
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