But that brings up a larger question of why there are spin
locks at all? If a CPU can't be doing one thing because a
particular resource is unavailable being used by another CPU, why
isn't it then sent off to do something else?
Please read "Unix Systems for Modern Architectures" by Curt Schimmel
for a good primer on spinlocks and why they are used in an OS.
Later,
David S. Miller
davem@redhat.com
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