6.0 and "options PREEMPTION"
Kris Kennaway
kris at obsecurity.org
Fri Oct 28 12:47:41 PDT 2005
On Fri, Oct 28, 2005 at 02:04:37PM +0100, Robert Watson wrote:
> On Thu, 27 Oct 2005, Doug Poland wrote:
>
> > One of the other nice benefits to the SMPVFS work is that
> > with our fully preemptive 6.x kernel, not holding the Giant
> > lock over the file system code lets the file system code not
> > only preempt lower precedence kernel threads, such as
> > background crypto operations or file system operations, but be
> > preempted by more timing critical code, such as sound card
> > interrupts, network I/O, and so on.
> >
> >Does this mean that options PREEMPTION is assumed in 6.0? If not, could
> >someone explain or point me to some docs that will help me understand.
>
> In FreeBSD 6.0 and higher, options PREEMPTION appears in the default
> kernel configuration (GENERIC).
Not on all architectures, though. e.g. PREEMPTION is not supported on
sparc64.
Kris
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