Date: Sat, 03 Aug 1996 15:02:40 -0600 From: Steve Passe <smp@csn.net> To: smp@freebsd.org Cc: hackers@freebsd.org Subject: halt & sysctl Message-ID: <199608032102.PAA14656@clem.systemsix.com>
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Hi,
I have observed that when halting SMP kernels the 'sync' never
finishes unless I manually disable the 2nd CPU via:
sysctl -w kern.smp_active=0
before issuing the halt command. I have been looking for a way
to do the equivalent in machdep.c:boot():
boot(howto)
int howto;
{
#ifdef SMP
/**
* FIXME: all but the first CPU needs to be disabled here!!!
* we want to do equiv. of "sysctl -w kern.smp_active=0"
*/
int status;
int sctl[2];
sctl[0] = CTL_KERN;
>>> sctl[1] = ???;
status = kernel_sysctl(&proc0, sctl, 2, 0, 0, 0, sizeof( int ), 0);
printf( "\nsysctl status: %d\n", status );
#endif /* SMP */
if (!cold && (howto & RB_NOSYNC) == 0 && waittime < 0) {
...
}
Am I barking up the right tree?
Anyone know the proper value for sctl[1]?
--
Steve Passe | powered by
smp@csn.net | FreeBSD
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