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    SubjectRe: [PATCH UPDATED] percpu: use dynamic percpu allocator as the default percpu allocator
    On Wed, Apr 01, 2009 at 12:39:46PM -0700, Linus Torvalds wrote:
    > The thing is, things like "read_mostly" or "access_rarely" may talk about
    > how we access those individual variables, but you're missing a _huge_
    > chunk of the puzzle if you ignore the _correlations_ of those accesses
    > with accesses to other variables.
    > The thign is, if you have variables 'a' and 'b', and they are always
    > accessed together, then it's probably worth it to put them in the same
    > cacheline.

    If you've got two global variables that are generally accessed together,
    they should probably be `annotated' as such by putting them in a struct.

    Matthew Wilcox Intel Open Source Technology Centre
    "Bill, look, we understand that you're interested in selling us this
    operating system, but compare it to ours. We can't possibly take such
    a retrograde step."

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