3 Commits

Author	SHA1	Message	Date
David S. Miller	4cfea5a7df	[SPARC64]: Fix atomic backoff limit. ... 4096 will not fit into the immediate field of a compare instruction, in fact it will end up being -4096 causing the check to fail every time and thus disabling backoff. Signed-off-by: David S. Miller <davem@davemloft.net>	2008-03-19 01:04:48 -07:00
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