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authorPaul E. McKenney <paul.mckenney@linaro.org>2011-01-12 14:10:23 -0800
committerPaul E. McKenney <paulmck@linux.vnet.ibm.com>2011-05-05 23:16:54 -0700
commita26ac2455ffcf3be5c6ef92bc6df7182700f2114 (patch)
tree601697c7c3fd152a1b3f29f43d3a028fc8fefd5f /Documentation
parent12f5f524cafef3ab689929b118f2dfb8bf2be321 (diff)
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op-kernel-dev-a26ac2455ffcf3be5c6ef92bc6df7182700f2114.tar.gz
rcu: move TREE_RCU from softirq to kthread
If RCU priority boosting is to be meaningful, callback invocation must be boosted in addition to preempted RCU readers. Otherwise, in presence of CPU real-time threads, the grace period ends, but the callbacks don't get invoked. If the callbacks don't get invoked, the associated memory doesn't get freed, so the system is still subject to OOM. But it is not reasonable to priority-boost RCU_SOFTIRQ, so this commit moves the callback invocations to a kthread, which can be boosted easily. Also add comments and properly synchronized all accesses to rcu_cpu_kthread_task, as suggested by Lai Jiangshan. Signed-off-by: Paul E. McKenney <paul.mckenney@linaro.org> Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com> Reviewed-by: Josh Triplett <josh@joshtriplett.org>
Diffstat (limited to 'Documentation')
-rw-r--r--Documentation/filesystems/proc.txt1
1 files changed, 0 insertions, 1 deletions
diff --git a/Documentation/filesystems/proc.txt b/Documentation/filesystems/proc.txt
index b0b814d..60740e8 100644
--- a/Documentation/filesystems/proc.txt
+++ b/Documentation/filesystems/proc.txt
@@ -836,7 +836,6 @@ Provides counts of softirq handlers serviced since boot time, for each cpu.
TASKLET: 0 0 0 290
SCHED: 27035 26983 26971 26746
HRTIMER: 0 0 0 0
- RCU: 1678 1769 2178 2250
1.3 IDE devices in /proc/ide
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