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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>
This commit is contained in:
Paul E. McKenney 2020-03-22 13:18:54 -07:00
parent 7e3b70e070
commit 9796e1ae73
1 changed files with 13 additions and 5 deletions
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18
kernel/rcu/tasks.h
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@ -15,7 +15,7 @@ struct rcu_tasks;
typedef void (*rcu_tasks_gp_func_t)(struct rcu_tasks *rtp);
typedef void (*pregp_func_t)(void);
typedef void (*pertask_func_t)(struct task_struct *t, struct list_head *hop);
typedef void (*postscan_func_t)(void);
typedef void (*postscan_func_t)(struct list_head *hop);
typedef void (*holdouts_func_t)(struct list_head *hop, bool ndrpt, bool *frptp);
typedef void (*postgp_func_t)(struct rcu_tasks *rtp);
@ -331,7 +331,7 @@ static void rcu_tasks_wait_gp(struct rcu_tasks *rtp)
rcu_read_unlock();
set_tasks_gp_state(rtp, RTGS_POST_SCAN_TASKLIST);
rtp->postscan_func();
rtp->postscan_func(&holdouts);
/*
* Each pass through the following loop scans the list of holdout
@ -415,7 +415,7 @@ static void rcu_tasks_pertask(struct task_struct *t, struct list_head *hop)
}
/* Processing between scanning taskslist and draining the holdout list. */
void rcu_tasks_postscan(void)
void rcu_tasks_postscan(struct list_head *hop)
{
/*
* Wait for tasks that are in the process of exiting. This
@ -936,9 +936,17 @@ static void rcu_tasks_trace_pertask(struct task_struct *t,
trc_wait_for_one_reader(t, hop);
}
/* Do intermediate processing between task and holdout scans. */
static void rcu_tasks_trace_postscan(void)
/*
* Do intermediate processing between task and holdout scans and
* pick up the idle tasks.
*/
static void rcu_tasks_trace_postscan(struct list_head *hop)
{
int cpu;
for_each_possible_cpu(cpu)
rcu_tasks_trace_pertask(idle_task(cpu), hop);
// Re-enable CPU hotplug now that the tasklist scan has completed.
cpus_read_unlock();