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On Tue, 25 May 1999, Linus Torvalds wrote:
> There's a pre-2.3.4-1 out there in "testing" on ftp.kernel.org, which has
> the new scalable network code (well, the first cut of it, anyway). It also
> updates ISDN and PPC to newer versions. Please test it out and give
> feedback..
linus-
attached is a patch that removes the global kernel lock from brk() and
when doing anonymous mmap(). it also reorganizes the locking logic in
handle_pte_fault() to reduce the amount of time spent with the lock held
needlessly. the handle_pte_fault() change may be more dangerous than the
brk() and mmap() changes. it may also be unnecessary with the upcoming
parallelized page cache.
i've tested under heavy load on UP, dual, and quad SMP. i didn't see
significant scalability improvements with my workload, but it doesn't
appear to be memory-allocation intensive. interactive feel is more
responsive on SMP hardware, however.
you may want to include something like this in a pre-2.3.4 kernel for
wider testing.
thanks,
- Chuck Lever
-- corporate: <chuckl@netscape.com> personal: <chucklever@netscape.net> or <cel@monkey.org>The Linux Scalability project: http://www.citi.umich.edu/projects/linux-scalability/
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