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8be6e1b15c
The handling of RCU's no-CBs CPUs has a maintenance headache, namely that if call_rcu() is invoked with interrupts disabled, the rcuo kthread wakeup must be defered to a point where we can be sure that scheduler locks are not held. Of course, there are a lot of code paths leading from an interrupts-disabled invocation of call_rcu(), and missing any one of these can result in excessive callback-invocation latency, and potentially even system hangs. This commit therefore uses a timer to guarantee that the wakeup will eventually occur. If one of the deferred-wakeup points kicks in, then the timer is simply cancelled. This commit also fixes up an incomplete removal of commits that were intended to plug remaining exit paths, which should have the added benefit of reducing the overhead of RCU's context-switch hooks. In addition, it simplifies leader-to-follower callback-list handoff by introducing locking. The call_rcu()-to-leader handoff continues to use atomic operations in order to maintain good real-time latency for common-case use of call_rcu(). Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com> [ paulmck: Dan Carpenter fix for mod_timer() usage bug found by smatch. ] |
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| .. | ||
| Kconfig | ||
| Kconfig.debug | ||
| Makefile | ||
| rcu_segcblist.c | ||
| rcu_segcblist.h | ||
| rcu.h | ||
| rcuperf.c | ||
| rcutorture.c | ||
| srcutiny.c | ||
| srcutree.c | ||
| sync.c | ||
| tiny_plugin.h | ||
| tiny.c | ||
| tree_exp.h | ||
| tree_plugin.h | ||
| tree.c | ||
| tree.h | ||
| update.c | ||