On Wed, Sep 04, 2002 at 05:05:58PM +0200, manfred@colorfullife.com wrote:
> What was cpu1 doing? There are 3 loops in smp_call_function:
> spin_lock(&call_lock), and 2 while loops with barrier() [first one for
> IPI arrival, second one for synchroneous ipi's. TLB flush is sync].
it was spinning on the first barrier loop, waiting for verification of the IPI arrival:
/* Wait for response */
while (atomic_read(&data.started) != cpus)
barrier();
Terence
-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@vger.kernel.org
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/
This archive was generated by hypermail 2b29 : Sat Sep 07 2002 - 22:00:22 EST