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| author | Paul E. McKenney <paulmck@linux.vnet.ibm.com> | 2014-08-05 02:43:50 +0200 |
|---|---|---|
| committer | Paul E. McKenney <paulmck@linux.vnet.ibm.com> | 2014-09-08 01:27:30 +0200 |
| commit | 176f8f7a52cc6d09d686f0d900abda6942a52fbb (patch) | |
| tree | bd3d6a8f21e576a94d1e1812c5c5317f62d1c96d /kernel/rcu/tree.h | |
| parent | rcu: Defer rcu_tasks_kthread() creation till first call_rcu_tasks() (diff) | |
| download | linux-176f8f7a52cc6d09d686f0d900abda6942a52fbb.tar.xz linux-176f8f7a52cc6d09d686f0d900abda6942a52fbb.zip | |
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 'kernel/rcu/tree.h')
| -rw-r--r-- | kernel/rcu/tree.h | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/kernel/rcu/tree.h b/kernel/rcu/tree.h index 6a86eb7bac45..3a92000c354f 100644 --- a/kernel/rcu/tree.h +++ b/kernel/rcu/tree.h @@ -605,6 +605,8 @@ static void rcu_sysidle_report_gp(struct rcu_state *rsp, int isidle, static void rcu_bind_gp_kthread(void); static void rcu_sysidle_init_percpu_data(struct rcu_dynticks *rdtp); static bool rcu_nohz_full_cpu(struct rcu_state *rsp); +static void rcu_dynticks_task_enter(void); +static void rcu_dynticks_task_exit(void); #endif /* #ifndef RCU_TREE_NONCORE */ |