Messages in this thread | | | Date | Tue, 22 Jun 1999 12:12:04 -0400 (EDT) | From | Alexander Viro <> | Subject | Re: parallel writes to the same file, 2.3.7 |
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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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