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authorPaul E. McKenney <paulmck@linux.vnet.ibm.com>2012-09-07 02:38:02 +0400
committerPaul E. McKenney <paulmck@linux.vnet.ibm.com>2012-09-23 18:41:56 +0400
commitb17c7035f37f47c7f7cb08a5555ab2aebfa31f91 (patch)
tree995c37771f64470dda04e631a8223e74d6713b0a /Documentation/RCU
parent4dbd6bb38dd1cbfa5cb21e56e51dffc74aa20038 (diff)
downloadlinux-b17c7035f37f47c7f7cb08a5555ab2aebfa31f91.tar.xz
rcu: Shrink RCU based on number of CPUs
Currently, rcu_init_geometry() only reshapes RCU's combining trees if the leaf fanout is changed at boot time. This means that by default, kernels compiled with (say) NR_CPUS=4096 will keep oversized data structures, even when running on systems with (say) four CPUs. This commit therefore checks to see if the maximum number of CPUs on the actual running system (nr_cpu_ids) differs from NR_CPUS, and if so reshapes the combining trees accordingly. Reported-by: Mike Galbraith <efault@gmx.de> Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
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