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authorPaul E. McKenney <paul.mckenney@linaro.org>2010-09-09 13:40:39 -0700
committerPaul E. McKenney <paulmck@linux.vnet.ibm.com>2010-11-17 15:45:09 -0800
commitb2c0710c464ede15e1fc52fb1e7ee9ba54cea186 (patch)
tree7524518fec8a02e53c3fab558b40a5e94f0bb5ec /include/linux/rcutree.h
parent8e8be45e8e55daa381028aec339829929ddb53a5 (diff)
downloadlinux-b2c0710c464ede15e1fc52fb1e7ee9ba54cea186.tar.gz
rcu: move TINY_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. Signed-off-by: Paul E. McKenney <paul.mckenney@linaro.org> Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
Diffstat (limited to 'include/linux/rcutree.h')
-rw-r--r--include/linux/rcutree.h1
1 files changed, 1 insertions, 0 deletions
diff --git a/include/linux/rcutree.h b/include/linux/rcutree.h
index 95518e628794..c0e96833aa73 100644
--- a/include/linux/rcutree.h
+++ b/include/linux/rcutree.h
@@ -30,6 +30,7 @@
#ifndef __LINUX_RCUTREE_H
#define __LINUX_RCUTREE_H
+extern void rcu_init(void);
extern void rcu_note_context_switch(int cpu);
extern int rcu_needs_cpu(int cpu);
extern void rcu_cpu_stall_reset(void);