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rcu-tasks: Make RCU tasks trace also wait for idle tasks
This commit scans the CPUs, adding each CPU's idle task to the list of tasks that need quiescent states. Signed-off-by: Paul E. McKenney <paulmck@kernel.org>
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@ -15,7 +15,7 @@ struct rcu_tasks;
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typedef void (*rcu_tasks_gp_func_t)(struct rcu_tasks *rtp);
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typedef void (*pregp_func_t)(void);
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typedef void (*pertask_func_t)(struct task_struct *t, struct list_head *hop);
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typedef void (*postscan_func_t)(void);
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typedef void (*postscan_func_t)(struct list_head *hop);
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typedef void (*holdouts_func_t)(struct list_head *hop, bool ndrpt, bool *frptp);
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typedef void (*postgp_func_t)(struct rcu_tasks *rtp);
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@ -331,7 +331,7 @@ static void rcu_tasks_wait_gp(struct rcu_tasks *rtp)
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rcu_read_unlock();
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set_tasks_gp_state(rtp, RTGS_POST_SCAN_TASKLIST);
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rtp->postscan_func();
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rtp->postscan_func(&holdouts);
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/*
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* Each pass through the following loop scans the list of holdout
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@ -415,7 +415,7 @@ static void rcu_tasks_pertask(struct task_struct *t, struct list_head *hop)
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}
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/* Processing between scanning taskslist and draining the holdout list. */
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void rcu_tasks_postscan(void)
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void rcu_tasks_postscan(struct list_head *hop)
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{
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/*
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* Wait for tasks that are in the process of exiting. This
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@ -936,9 +936,17 @@ static void rcu_tasks_trace_pertask(struct task_struct *t,
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trc_wait_for_one_reader(t, hop);
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}
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/* Do intermediate processing between task and holdout scans. */
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static void rcu_tasks_trace_postscan(void)
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/*
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* Do intermediate processing between task and holdout scans and
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* pick up the idle tasks.
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*/
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static void rcu_tasks_trace_postscan(struct list_head *hop)
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{
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int cpu;
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for_each_possible_cpu(cpu)
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rcu_tasks_trace_pertask(idle_task(cpu), hop);
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// Re-enable CPU hotplug now that the tasklist scan has completed.
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cpus_read_unlock();
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