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2 commits

Author SHA1 Message Date
David S. Miller
0aa031d9e0 [SPARC64]: Fix BACKOFF_SPIN on non-SMP. 
It can't be just empty, it has to at least branch
back to 'label'.

Signed-off-by: David S. Miller <davem@davemloft.net>
 2007-10-27 00:23:22 -07:00
David S. Miller
24f287e412 [SPARC64]: Implement atomic backoff. 
When the cpu count is high and contention hits an atomic object, the
processors can synchronize such that some cpus continually get knocked
out and cannot complete the atomic update.

So implement an exponential backoff when SMP.

Signed-off-by: David S. Miller <davem@davemloft.net>
 2007-10-17 16:24:55 -07:00