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authorPaul E. McKenney <paulmck@linux.vnet.ibm.com>2014-08-04 17:43:50 -0700
committerPaul E. McKenney <paulmck@linux.vnet.ibm.com>2014-09-07 16:27:30 -0700
commit176f8f7a52cc6d09d686f0d900abda6942a52fbb (patch)
treebd3d6a8f21e576a94d1e1812c5c5317f62d1c96d /include/linux/init_task.h
parent84a8f446ffd70c2799a96268aaa4d47c22a83ff0 (diff)
downloadop-kernel-dev-176f8f7a52cc6d09d686f0d900abda6942a52fbb.zip
op-kernel-dev-176f8f7a52cc6d09d686f0d900abda6942a52fbb.tar.gz
rcu: Make TASKS_RCU handle nohz_full= CPUs
Currently TASKS_RCU would ignore a CPU running a task in nohz_full= usermode execution. There would be neither a context switch nor a scheduling-clock interrupt to tell TASKS_RCU that the task in question had passed through a quiescent state. The grace period would therefore extend indefinitely. This commit therefore makes RCU's dyntick-idle subsystem record the task_struct structure of the task that is running in dyntick-idle mode on each CPU. The TASKS_RCU grace period can then access this information and record a quiescent state on behalf of any CPU running in dyntick-idle usermode. Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
Diffstat (limited to 'include/linux/init_task.h')
-rw-r--r--include/linux/init_task.h3
1 files changed, 2 insertions, 1 deletions
diff --git a/include/linux/init_task.h b/include/linux/init_task.h
index dffd925..03b2748 100644
--- a/include/linux/init_task.h
+++ b/include/linux/init_task.h
@@ -121,7 +121,8 @@ extern struct group_info init_groups;
#define INIT_TASK_RCU_TASKS(tsk) \
.rcu_tasks_holdout = false, \
.rcu_tasks_holdout_list = \
- LIST_HEAD_INIT(tsk.rcu_tasks_holdout_list),
+ LIST_HEAD_INIT(tsk.rcu_tasks_holdout_list), \
+ .rcu_tasks_idle_cpu = -1,
#else
#define INIT_TASK_RCU_TASKS(tsk)
#endif
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