Re: [PATCH] address_space_operations unification

From: Jeff Garzik (
Date: Mon May 08 2000 - 14:07:39 EST

On 8 May 2000 wrote:
> Linus Torvalds <> writes:
> [ ... ]
> > Happily, the "multiple mmaped writers" case is extremely rare and usually
> > doesn't make any sense at all (which is probably why it is rare), so the
> > performance issue is probably not really a very realistic one.
> >
> > [ Famous last words. I wonder when the next mindcraft comes along and
> > creates a benchmark for this.. It would have to be fairly contrieved, I
> > suspect. ]

> Unfortunately, no. :-(
> Once apon a time there used to be a news server that used
> a mmap()'ed active and history file with lots of process
> receiving news and writing updates into the active and
> history files. Alas, poor thru-put. I knew it,
> Horatio....

Ever more so with HighWind's Typhoon product. Their news server product
is highly multi-threaded, and makes extremely heavy use of mmap(),
including a lot of parallel mmap writers. Their software even broke
some early 2.2.x kernels -- exposed some threading bugs IIRC.


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This archive was generated by hypermail 2b29 : Mon May 15 2000 - 21:00:12 EST