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rcu/tasks: Add detailed grace-period and barrier diagnostics

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This commit adds rcu_tasks_torture_stats_print(),
rcu_tasks_trace_torture_stats_print(), and
rcu_tasks_rude_torture_stats_print() functions that provide detailed
diagnostics on grace-period, callback, and barrier state.

Signed-off-by: "Paul E. McKenney" <paulmck@kernel.org>
Signed-off-by: Neeraj Upadhyay <neeraj.upadhyay@kernel.org>
This commit is contained in:
Paul E. McKenney 2024-08-01 17:34:25 -07:00 committed by Neeraj Upadhyay
parent d3f84aeb71
commit fe91cf39db
2 changed files with 67 additions and 2 deletions
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3
include/linux/rcupdate.h
View File

@ -164,6 +164,7 @@ static inline void rcu_nocb_flush_deferred_wakeup(void) { }
} while (0) } while (0)
void call_rcu_tasks(struct rcu_head *head, rcu_callback_t func); void call_rcu_tasks(struct rcu_head *head, rcu_callback_t func);
void synchronize_rcu_tasks(void); void synchronize_rcu_tasks(void);
void rcu_tasks_torture_stats_print(char *tt, char *tf);
# else # else
# define rcu_tasks_classic_qs(t, preempt) do { } while (0) # define rcu_tasks_classic_qs(t, preempt) do { } while (0)
# define call_rcu_tasks call_rcu # define call_rcu_tasks call_rcu
@ -190,6 +191,7 @@ void rcu_tasks_trace_qs_blkd(struct task_struct *t);
rcu_tasks_trace_qs_blkd(t); \ rcu_tasks_trace_qs_blkd(t); \
} \ } \
} while (0) } while (0)
void rcu_tasks_trace_torture_stats_print(char *tt, char *tf);
# else # else
# define rcu_tasks_trace_qs(t) do { } while (0) # define rcu_tasks_trace_qs(t) do { } while (0)
# endif # endif
@ -202,6 +204,7 @@ do { \
# ifdef CONFIG_TASKS_RUDE_RCU # ifdef CONFIG_TASKS_RUDE_RCU
void synchronize_rcu_tasks_rude(void); void synchronize_rcu_tasks_rude(void);
void rcu_tasks_rude_torture_stats_print(char *tt, char *tf);
# endif # endif
#define rcu_note_voluntary_context_switch(t) rcu_tasks_qs(t, false) #define rcu_note_voluntary_context_switch(t) rcu_tasks_qs(t, false)

66
kernel/rcu/tasks.h
View File

@ -714,9 +714,7 @@ static void __init rcu_tasks_bootup_oddness(void)
#endif /* #ifdef CONFIG_TASKS_TRACE_RCU */ #endif /* #ifdef CONFIG_TASKS_TRACE_RCU */
} }
#endif /* #ifndef CONFIG_TINY_RCU */
#ifndef CONFIG_TINY_RCU
/* Dump out rcutorture-relevant state common to all RCU-tasks flavors. */ /* 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) static void show_rcu_tasks_generic_gp_kthread(struct rcu_tasks *rtp, char *s)
{ {
@ -750,6 +748,52 @@ static void show_rcu_tasks_generic_gp_kthread(struct rcu_tasks *rtp, char *s)
rtp->lazy_jiffies, rtp->lazy_jiffies,
s); s);
} }
/* Dump out more rcutorture-relevant state common to all RCU-tasks flavors. */
static void rcu_tasks_torture_stats_print_generic(struct rcu_tasks *rtp, char *tt,
char *tf, char *tst)
{
cpumask_var_t cm;
int cpu;
bool gotcb = false;
unsigned long j = jiffies;
pr_alert("%s%s Tasks%s RCU g%ld gp_start %lu gp_jiffies %lu gp_state %d (%s).\n",
tt, tf, tst, data_race(rtp->tasks_gp_seq),
j - data_race(rtp->gp_start), j - data_race(rtp->gp_jiffies),
data_race(rtp->gp_state), tasks_gp_state_getname(rtp));
pr_alert("\tEnqueue shift %d limit %d Dequeue limit %d gpseq %lu.\n",
data_race(rtp->percpu_enqueue_shift),
data_race(rtp->percpu_enqueue_lim),
data_race(rtp->percpu_dequeue_lim),
data_race(rtp->percpu_dequeue_gpseq));
(void)zalloc_cpumask_var(&cm, GFP_KERNEL);
pr_alert("\tCallback counts:");
for_each_possible_cpu(cpu) {
long n;
struct rcu_tasks_percpu *rtpcp = per_cpu_ptr(rtp->rtpcpu, cpu);
if (cpumask_available(cm) && !rcu_barrier_cb_is_done(&rtpcp->barrier_q_head))
cpumask_set_cpu(cpu, cm);
n = rcu_segcblist_n_cbs(&rtpcp->cblist);
if (!n)
continue;
pr_cont(" %d:%ld", cpu, n);
gotcb = true;
}
if (gotcb)
pr_cont(".\n");
else
pr_cont(" (none).\n");
pr_alert("\tBarrier seq %lu count %d holdout CPUs ",
data_race(rtp->barrier_q_seq), atomic_read(&rtp->barrier_q_count));
if (cpumask_available(cm) && !cpumask_empty(cm))
pr_cont(" %*pbl.\n", cpumask_pr_args(cm));
else
pr_cont("(none).\n");
free_cpumask_var(cm);
}
#endif // #ifndef CONFIG_TINY_RCU #endif // #ifndef CONFIG_TINY_RCU
static void exit_tasks_rcu_finish_trace(struct task_struct *t); static void exit_tasks_rcu_finish_trace(struct task_struct *t);
@ -1201,6 +1245,12 @@ void show_rcu_tasks_classic_gp_kthread(void)
show_rcu_tasks_generic_gp_kthread(&rcu_tasks, ""); show_rcu_tasks_generic_gp_kthread(&rcu_tasks, "");
} }
EXPORT_SYMBOL_GPL(show_rcu_tasks_classic_gp_kthread); EXPORT_SYMBOL_GPL(show_rcu_tasks_classic_gp_kthread);
void rcu_tasks_torture_stats_print(char *tt, char *tf)
{
rcu_tasks_torture_stats_print_generic(&rcu_tasks, tt, tf, "");
}
EXPORT_SYMBOL_GPL(rcu_tasks_torture_stats_print);
#endif // !defined(CONFIG_TINY_RCU) #endif // !defined(CONFIG_TINY_RCU)
struct task_struct *get_rcu_tasks_gp_kthread(void) struct task_struct *get_rcu_tasks_gp_kthread(void)
@ -1361,6 +1411,12 @@ void show_rcu_tasks_rude_gp_kthread(void)
show_rcu_tasks_generic_gp_kthread(&rcu_tasks_rude, ""); show_rcu_tasks_generic_gp_kthread(&rcu_tasks_rude, "");
} }
EXPORT_SYMBOL_GPL(show_rcu_tasks_rude_gp_kthread); EXPORT_SYMBOL_GPL(show_rcu_tasks_rude_gp_kthread);
void rcu_tasks_rude_torture_stats_print(char *tt, char *tf)
{
rcu_tasks_torture_stats_print_generic(&rcu_tasks_rude, tt, tf, "");
}
EXPORT_SYMBOL_GPL(rcu_tasks_rude_torture_stats_print);
#endif // !defined(CONFIG_TINY_RCU) #endif // !defined(CONFIG_TINY_RCU)
struct task_struct *get_rcu_tasks_rude_gp_kthread(void) struct task_struct *get_rcu_tasks_rude_gp_kthread(void)
@ -2038,6 +2094,12 @@ void show_rcu_tasks_trace_gp_kthread(void)
show_rcu_tasks_generic_gp_kthread(&rcu_tasks_trace, buf); show_rcu_tasks_generic_gp_kthread(&rcu_tasks_trace, buf);
} }
EXPORT_SYMBOL_GPL(show_rcu_tasks_trace_gp_kthread); EXPORT_SYMBOL_GPL(show_rcu_tasks_trace_gp_kthread);
void rcu_tasks_trace_torture_stats_print(char *tt, char *tf)
{
rcu_tasks_torture_stats_print_generic(&rcu_tasks_trace, tt, tf, "");
}
EXPORT_SYMBOL_GPL(rcu_tasks_trace_torture_stats_print);
#endif // !defined(CONFIG_TINY_RCU) #endif // !defined(CONFIG_TINY_RCU)
struct task_struct *get_rcu_tasks_trace_gp_kthread(void) struct task_struct *get_rcu_tasks_trace_gp_kthread(void)