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    SubjectRe: [RFC PATCH] net: add dataref destructor to sk_buff
    Herbert Xu wrote:
    > On Fri, Nov 13, 2009 at 08:33:35PM -0500, Gregory Haskins wrote:
    >> Well, not with respect to the overall protocol, of course not. But with
    >> respect to the buffer in question, it _has_ to be. Or am I missing
    >> something?
    > sendfile() has never guaranteed that the kernel is finished with
    > the underlying pages when it returns.
    > Cheers,

    Clearly there must be _some_ mechanism to synchronize (e.g.
    flush/barrier) though, right? Otherwise, that interface would seem to
    be quite prone to races and would likely be unusable. So what does
    said flush use to know when the buffer is free?


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