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rcu-tasks: Add RCU tasks to rcutorture writer stall output 

This commit adds state for each RCU-tasks flavor to the rcutorture
writer stall output.  The initial state is minimal, but you have to
start somewhere.

Signed-off-by: Paul E. McKenney <paulmck@kernel.org>
[ paulmck: Fixes based on feedback from kbuild test robot. ]
This commit is contained in:
Paul E. McKenney 2020-03-16 11:01:55 -07:00
parent 8fd8ca388c
commit e21408ceec
3 changed files with 45 additions and 3 deletions
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1
kernel/rcu/rcu.h
View File

@ -431,6 +431,7 @@ bool rcu_gp_is_expedited(void); /* Internal RCU use. */
void rcu_expedite_gp(void);
void rcu_unexpedite_gp(void);
void rcupdate_announce_bootup_oddness(void);
void show_rcu_tasks_gp_kthreads(void);
void rcu_request_urgent_qs_task(struct task_struct *t);
#endif /* #else #ifdef CONFIG_TINY_RCU */

45
kernel/rcu/tasks.h
View File

@ -219,6 +219,16 @@ static void __init rcu_tasks_bootup_oddness(void)
#endif /* #ifndef CONFIG_TINY_RCU */
/* Dump out rcutorture-relevant state common to all RCU-tasks flavors. */
static void show_rcu_tasks_generic_gp_kthread(struct rcu_tasks *rtp, char *s)
{
pr_info("%s %c%c %s\n",
rtp->kname,
".k"[!!data_race(rtp->kthread_ptr)],
".C"[!!data_race(rtp->cbs_head)],
s);
}
#ifdef CONFIG_TASKS_RCU
////////////////////////////////////////////////////////////////////////
@ -482,7 +492,14 @@ static int __init rcu_spawn_tasks_kthread(void)
}
core_initcall(rcu_spawn_tasks_kthread);
#endif /* #ifdef CONFIG_TASKS_RCU */
static void show_rcu_tasks_classic_gp_kthread(void)
{
show_rcu_tasks_generic_gp_kthread(&rcu_tasks, "");
}
#else /* #ifdef CONFIG_TASKS_RCU */
static void show_rcu_tasks_classic_gp_kthread(void) { }
#endif /* #else #ifdef CONFIG_TASKS_RCU */
#ifdef CONFIG_TASKS_RUDE_RCU
@ -578,7 +595,14 @@ static int __init rcu_spawn_tasks_rude_kthread(void)
}
core_initcall(rcu_spawn_tasks_rude_kthread);
#endif /* #ifdef CONFIG_TASKS_RUDE_RCU */
static void show_rcu_tasks_rude_gp_kthread(void)
{
show_rcu_tasks_generic_gp_kthread(&rcu_tasks_rude, "");
}
#else /* #ifdef CONFIG_TASKS_RUDE_RCU */
static void show_rcu_tasks_rude_gp_kthread(void) {}
#endif /* #else #ifdef CONFIG_TASKS_RUDE_RCU */
////////////////////////////////////////////////////////////////////////
//
@ -982,10 +1006,27 @@ static int __init rcu_spawn_tasks_trace_kthread(void)
}
core_initcall(rcu_spawn_tasks_trace_kthread);
static void show_rcu_tasks_trace_gp_kthread(void)
{
char buf[32];
sprintf(buf, "N%d", atomic_read(&trc_n_readers_need_end));
show_rcu_tasks_generic_gp_kthread(&rcu_tasks_trace, buf);
}
#else /* #ifdef CONFIG_TASKS_TRACE_RCU */
void exit_tasks_rcu_finish_trace(struct task_struct *t) { }
static inline void show_rcu_tasks_trace_gp_kthread(void) {}
#endif /* #else #ifdef CONFIG_TASKS_TRACE_RCU */
void show_rcu_tasks_gp_kthreads(void)
{
show_rcu_tasks_classic_gp_kthread();
show_rcu_tasks_rude_gp_kthread();
show_rcu_tasks_trace_gp_kthread();
}
#else /* #ifdef CONFIG_TASKS_RCU_GENERIC */
static inline void rcu_tasks_bootup_oddness(void) {}
void show_rcu_tasks_gp_kthreads(void) {}
#endif /* #else #ifdef CONFIG_TASKS_RCU_GENERIC */

2
kernel/rcu/tree_stall.h
View File

@ -649,7 +649,7 @@ void show_rcu_gp_kthreads(void)
if (rcu_segcblist_is_offloaded(&rdp->cblist))
show_rcu_nocb_state(rdp);
}
/* sched_show_task(rcu_state.gp_kthread); */
show_rcu_tasks_gp_kthreads();
}
EXPORT_SYMBOL_GPL(show_rcu_gp_kthreads);