Date: Wed, 2 Oct 1996 12:07:11 -0700 (PDT) From: Peter Wemm <peter> To: freebsd-smp Subject: cvs commit: sys/kern init_main.c sys/i386/i386 mpboot.s Message-ID: <199610021907.MAA28520@freefall.freebsd.org>
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peter 96/10/02 12:07:10
Modified: kern init_main.c
i386/i386 mpboot.s
Log:
Kill some NCPU == 2 dependencies.
Theoretically, it can now run 'n' cpus (n < 15). It creates as many
idle procs as are needed, and carefully brings them online so that it
can reuse mp_stk each time. I've not looked very closely, but I think
most other places in the code deal with 'NCPU'. I'll check soon.
It uses a new type of mutex semaphore for unlocking the cpus, as suggested
in some intel docs.
Also... shudder.. It fires up the alternate cpus as soon as the idle proc
is scheduled, ie: at boot time immediately after init. No more need to
set kern.smp_active to 2. In theory, if you have 4 cpus, smp_active should
end up with the value "4". Raising and lowering it will probably enable and
disable the appropriate numbered cpus. Setting smp_active to 1 should cause
the system to effectively run uniprocessor.
"It works for me (TM)"..
Revision Changes Path
1.24 +63 -40 sys/kern/init_main.c
1.4 +30 -8 sys/i386/i386/mpboot.s
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