01-05-2013
I wouldn't recommend
this method for disabling CPU's at run-time since I've never tried it myself and I've had bad luck doing the same with using sysfs to remove HDD objects without a reboot (I got a Kernel Panic). There is also the "maxcpus" kernel parameter for limiting the number of CPU's available for use.
If you're going to do that last one, though, it would require a reboot obviously. But why not just shut the VM down after hours, reduce the number of CPU's on the VMWare side and then boot back again?
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LEARN ABOUT OPENSOLARIS
reboot
reboot(3C) Standard C Library Functions reboot(3C)
NAME
reboot - reboot system or halt processor
SYNOPSIS
#include <sys/reboot.h>
int reboot(int howto, char *bootargs);
DESCRIPTION
The reboot() function reboots the system. The howto argument specifies the behavior of the system while rebooting and is a mask con-
structed by a bitwise-inclusive-OR of flags from the following list:
RB_AUTOBOOT The machine is rebooted from the root filesystem on the default boot device. This is the default behavior. See boot(1M) and
kernel(1M).
RB_HALT The processor is simply halted; no reboot takes place. This option should be used with caution.
RB_ASKNAME Interpreted by the bootstrap program and kernel, causing the user to be asked for pathnames during the bootstrap.
RB_DUMP The system is forced to panic immediately without any further processing and a crash dump is written to the dump device (see
dumpadm(1M)) before rebooting.
Any other howto argument causes the kernel file to boot.
The interpretation of the bootargs argument is platform-dependent.
RETURN VALUES
Upon successful completion, reboot() never returns. Otherwise, -1 is returned and errno is set to indicate the error.
ERRORS
The reboot() function will fail if:
EPERM The {PRIV_SYS_CONFIG} privilege is not asserted in the effective set of the calling process.
SEE ALSO
Intro(1M), boot(1M), dumpadm(1M), halt(1M), init(1M), kernel(1M), reboot(1M), uadmin(2)
SunOS 5.11 22 Mar 2004 reboot(3C)