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authorPaul E. McKenney <paulmck@linux.vnet.ibm.com>2009-12-02 12:10:14 -0800
committerIngo Molnar <mingo@elte.hu>2009-12-03 11:34:53 +0100
commitcf244dc01bf68e1ad338b82447f8686d24ea4435 (patch)
treedc2aebb60ef1eddf92d7e23b72ec2f6c08797684 /init/Kconfig
parentd3f6bad3911736e44ba11f3f3f6ac4e8c837fdfc (diff)
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rcu: Enable fourth level of TREE_RCU hierarchy
Enable a fourth level of rcu_node hierarchy for TREE_RCU and TREE_PREEMPT_RCU. This is for stress-testing and experiemental purposes only, although in theory this would enable 16,777,216 CPUs on 64-bit systems, though only 1,048,576 CPUs on 32-bit systems. Normal experimental use of this fourth level will normally set CONFIG_RCU_FANOUT=2, requiring a 16-CPU system, though the more adventurous (and more fortunate) experimenters may wish to chose CONFIG_RCU_FANOUT=3 for 81-CPU systems or even CONFIG_RCU_FANOUT=4 for 256-CPU systems. Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com> Acked-by: Josh Triplett <josh@joshtriplett.org> Acked-by: Lai Jiangshan <laijs@cn.fujitsu.com> Cc: dipankar@in.ibm.com Cc: mathieu.desnoyers@polymtl.ca Cc: dvhltc@us.ibm.com Cc: niv@us.ibm.com Cc: peterz@infradead.org Cc: rostedt@goodmis.org Cc: Valdis.Kletnieks@vt.edu Cc: dhowells@redhat.com LKML-Reference: <12597846161257-git-send-email-> Signed-off-by: Ingo Molnar <mingo@elte.hu>
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