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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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