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    SubjectRe: parallel writes to the same file, 2.3.7


    On Tue, 22 Jun 1999, Ingo Molnar wrote:

    >
    > > the 2.3.7 pagecache changes give so much more than just raw SMP
    > > performance:
    >
    > forgot to mention another, 'much requested' Linux feature that has been
    > added/enabled by the new pagecache: now file writes can happen in
    > parallel, even at once (if on an SMP box).
    >
    > Until 2.3.7 all file writes were serialized by the 'inode semaphore', ie.
    > one big write excluded all other writers until the big write finished.

    Caution: side effect of that change was not pretty. truncate() used to be
    serialized wrt write(). Now it isn't. We might contract some races here.


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