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authorPaul E. McKenney <paul.mckenney@linaro.org>2012-04-13 12:54:22 -0700
committerPaul E. McKenney <paulmck@linux.vnet.ibm.com>2012-05-02 14:48:27 -0700
commit9dd8fb16c36178df2066387d2abd44d8b4dca8c8 (patch)
tree330ac5704044c12bcc94ec6bf96dbb27d1057f5d /kernel/rcupdate.c
parent616c310e83b872024271c915c1b9ab505b9efad9 (diff)
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rcu: Make exit_rcu() more precise and consolidate
When running preemptible RCU, if a task exits in an RCU read-side critical section having blocked within that same RCU read-side critical section, the task must be removed from the list of tasks blocking a grace period (perhaps the current grace period, perhaps the next grace period, depending on timing). The exit() path invokes exit_rcu() to do this cleanup. However, the current implementation of exit_rcu() needlessly does the cleanup even if the task did not block within the current RCU read-side critical section, which wastes time and needlessly increases the size of the state space. Fix this by only doing the cleanup if the current task is actually on the list of tasks blocking some grace period. While we are at it, consolidate the two identical exit_rcu() functions into a single function. Signed-off-by: Paul E. McKenney <paul.mckenney@linaro.org> Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com> Tested-by: Linus Torvalds <torvalds@linux-foundation.org> Conflicts: kernel/rcupdate.c
Diffstat (limited to 'kernel/rcupdate.c')
-rw-r--r--kernel/rcupdate.c28
1 files changed, 28 insertions, 0 deletions
diff --git a/kernel/rcupdate.c b/kernel/rcupdate.c
index a86f1741cc27..95cba41ce1e9 100644
--- a/kernel/rcupdate.c
+++ b/kernel/rcupdate.c
@@ -51,6 +51,34 @@
#include "rcu.h"
+#ifdef CONFIG_PREEMPT_RCU
+
+/*
+ * Check for a task exiting while in a preemptible-RCU read-side
+ * critical section, clean up if so. No need to issue warnings,
+ * as debug_check_no_locks_held() already does this if lockdep
+ * is enabled.
+ */
+void exit_rcu(void)
+{
+ struct task_struct *t = current;
+
+ if (likely(list_empty(&current->rcu_node_entry)))
+ return;
+ t->rcu_read_lock_nesting = 1;
+ barrier();
+ t->rcu_read_unlock_special = RCU_READ_UNLOCK_BLOCKED;
+ __rcu_read_unlock();
+}
+
+#else /* #ifdef CONFIG_PREEMPT_RCU */
+
+void exit_rcu(void)
+{
+}
+
+#endif /* #else #ifdef CONFIG_PREEMPT_RCU */
+
#ifdef CONFIG_DEBUG_LOCK_ALLOC
static struct lock_class_key rcu_lock_key;
struct lockdep_map rcu_lock_map =