From: Paul E. McKenney <paul.mckenney@linaro.org>
Date: Thu, 14 Apr 2011 19:13:53 +0000 (-0700)
Subject: rcu: Force per-rcu_node kthreads off of the outgoing CPU
X-Git-Tag: v3.0-rc1~392^2~72
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=0f962a5e7277c34987b77dc82fc9aefcedc95e27;p=pandora-kernel.git

rcu: Force per-rcu_node kthreads off of the outgoing CPU

The scheduler has had some heartburn in the past when too many real-time
kthreads were affinitied to the outgoing CPU.  So, this commit lightens
the load by forcing the per-rcu_node and the boost kthreads off of the
outgoing CPU.  Note that RCU's per-CPU kthread remains on the outgoing
CPU until the bitter end, as it must in order to preserve correctness.

Also avoid disabling hardirqs across calls to set_cpus_allowed_ptr(),
given that this function can block.

Signed-off-by: Paul E. McKenney <paul.mckenney@linaro.org>
Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
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