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Diffstat (limited to 'kernel/time/timer_list.c')
-rw-r--r--kernel/time/timer_list.c179
1 files changed, 130 insertions, 49 deletions
diff --git a/kernel/time/timer_list.c b/kernel/time/timer_list.c
index 67fe8fc21fb..61ed862cdd3 100644
--- a/kernel/time/timer_list.c
+++ b/kernel/time/timer_list.c
@@ -20,6 +20,13 @@
#include <asm/uaccess.h>
+
+struct timer_list_iter {
+ int cpu;
+ bool second_pass;
+ u64 now;
+};
+
typedef void (*print_fn_t)(struct seq_file *m, unsigned int *classes);
DECLARE_PER_CPU(struct hrtimer_cpu_base, hrtimer_bases);
@@ -41,19 +48,20 @@ static void print_name_offset(struct seq_file *m, void *sym)
char symname[KSYM_NAME_LEN];
if (lookup_symbol_name((unsigned long)sym, symname) < 0)
- SEQ_printf(m, "<%p>", sym);
+ SEQ_printf(m, "<%pK>", sym);
else
SEQ_printf(m, "%s", symname);
}
static void
-print_timer(struct seq_file *m, struct hrtimer *timer, int idx, u64 now)
+print_timer(struct seq_file *m, struct hrtimer *taddr, struct hrtimer *timer,
+ int idx, u64 now)
{
#ifdef CONFIG_TIMER_STATS
char tmp[TASK_COMM_LEN + 1];
#endif
SEQ_printf(m, " #%d: ", idx);
- print_name_offset(m, timer);
+ print_name_offset(m, taddr);
SEQ_printf(m, ", ");
print_name_offset(m, timer->function);
SEQ_printf(m, ", S:%02lx", timer->state);
@@ -65,9 +73,11 @@ print_timer(struct seq_file *m, struct hrtimer *timer, int idx, u64 now)
SEQ_printf(m, ", %s/%d", tmp, timer->start_pid);
#endif
SEQ_printf(m, "\n");
- SEQ_printf(m, " # expires at %Lu nsecs [in %Ld nsecs]\n",
- (unsigned long long)ktime_to_ns(timer->expires),
- (long long)(ktime_to_ns(timer->expires) - now));
+ SEQ_printf(m, " # expires at %Lu-%Lu nsecs [in %Ld to %Ld nsecs]\n",
+ (unsigned long long)ktime_to_ns(hrtimer_get_softexpires(timer)),
+ (unsigned long long)ktime_to_ns(hrtimer_get_expires(timer)),
+ (long long)(ktime_to_ns(hrtimer_get_softexpires(timer)) - now),
+ (long long)(ktime_to_ns(hrtimer_get_expires(timer)) - now));
}
static void
@@ -76,39 +86,40 @@ print_active_timers(struct seq_file *m, struct hrtimer_clock_base *base,
{
struct hrtimer *timer, tmp;
unsigned long next = 0, i;
- struct rb_node *curr;
+ struct timerqueue_node *curr;
unsigned long flags;
next_one:
i = 0;
- spin_lock_irqsave(&base->cpu_base->lock, flags);
+ raw_spin_lock_irqsave(&base->cpu_base->lock, flags);
- curr = base->first;
+ curr = timerqueue_getnext(&base->active);
/*
* Crude but we have to do this O(N*N) thing, because
* we have to unlock the base when printing:
*/
while (curr && i < next) {
- curr = rb_next(curr);
+ curr = timerqueue_iterate_next(curr);
i++;
}
if (curr) {
- timer = rb_entry(curr, struct hrtimer, node);
+ timer = container_of(curr, struct hrtimer, node);
tmp = *timer;
- spin_unlock_irqrestore(&base->cpu_base->lock, flags);
+ raw_spin_unlock_irqrestore(&base->cpu_base->lock, flags);
- print_timer(m, &tmp, i, now);
+ print_timer(m, timer, &tmp, i, now);
next++;
goto next_one;
}
- spin_unlock_irqrestore(&base->cpu_base->lock, flags);
+ raw_spin_unlock_irqrestore(&base->cpu_base->lock, flags);
}
static void
print_base(struct seq_file *m, struct hrtimer_clock_base *base, u64 now)
{
+ SEQ_printf(m, " .base: %pK\n", base);
SEQ_printf(m, " .index: %d\n",
base->index);
SEQ_printf(m, " .resolution: %Lu nsecs\n",
@@ -129,7 +140,6 @@ static void print_cpu(struct seq_file *m, int cpu, u64 now)
struct hrtimer_cpu_base *cpu_base = &per_cpu(hrtimer_bases, cpu);
int i;
- SEQ_printf(m, "\n");
SEQ_printf(m, "cpu: %d\n", cpu);
for (i = 0; i < HRTIMER_MAX_CLOCK_BASES; i++) {
SEQ_printf(m, " clock %d:\n", i);
@@ -146,6 +156,9 @@ static void print_cpu(struct seq_file *m, int cpu, u64 now)
P_ns(expires_next);
P(hres_active);
P(nr_events);
+ P(nr_retries);
+ P(nr_hangs);
+ P_ns(max_hang_time);
#endif
#undef P
#undef P_ns
@@ -160,7 +173,7 @@ static void print_cpu(struct seq_file *m, int cpu, u64 now)
{
struct tick_sched *ts = tick_get_tick_sched(cpu);
P(nohz_mode);
- P_ns(idle_tick);
+ P_ns(last_tick);
P(tick_stopped);
P(idle_jiffies);
P(idle_calls);
@@ -169,6 +182,7 @@ static void print_cpu(struct seq_file *m, int cpu, u64 now)
P_ns(idle_waketime);
P_ns(idle_exittime);
P_ns(idle_sleeptime);
+ P_ns(iowait_sleeptime);
P(last_jiffies);
P(next_jiffies);
P_ns(idle_expires);
@@ -179,16 +193,20 @@ static void print_cpu(struct seq_file *m, int cpu, u64 now)
#undef P
#undef P_ns
+ SEQ_printf(m, "\n");
}
#ifdef CONFIG_GENERIC_CLOCKEVENTS
static void
-print_tickdevice(struct seq_file *m, struct tick_device *td)
+print_tickdevice(struct seq_file *m, struct tick_device *td, int cpu)
{
struct clock_event_device *dev = td->evtdev;
- SEQ_printf(m, "\n");
SEQ_printf(m, "Tick Device: mode: %d\n", td->mode);
+ if (cpu < 0)
+ SEQ_printf(m, "Broadcast device\n");
+ else
+ SEQ_printf(m, "Per CPU device: %d\n", cpu);
SEQ_printf(m, "Clock Event Device: ");
if (!dev) {
@@ -196,10 +214,12 @@ print_tickdevice(struct seq_file *m, struct tick_device *td)
return;
}
SEQ_printf(m, "%s\n", dev->name);
- SEQ_printf(m, " max_delta_ns: %lu\n", dev->max_delta_ns);
- SEQ_printf(m, " min_delta_ns: %lu\n", dev->min_delta_ns);
- SEQ_printf(m, " mult: %lu\n", dev->mult);
- SEQ_printf(m, " shift: %d\n", dev->shift);
+ SEQ_printf(m, " max_delta_ns: %llu\n",
+ (unsigned long long) dev->max_delta_ns);
+ SEQ_printf(m, " min_delta_ns: %llu\n",
+ (unsigned long long) dev->min_delta_ns);
+ SEQ_printf(m, " mult: %u\n", dev->mult);
+ SEQ_printf(m, " shift: %u\n", dev->shift);
SEQ_printf(m, " mode: %d\n", dev->mode);
SEQ_printf(m, " next_event: %Ld nsecs\n",
(unsigned long long) ktime_to_ns(dev->next_event));
@@ -215,75 +235,136 @@ print_tickdevice(struct seq_file *m, struct tick_device *td)
SEQ_printf(m, " event_handler: ");
print_name_offset(m, dev->event_handler);
SEQ_printf(m, "\n");
+ SEQ_printf(m, " retries: %lu\n", dev->retries);
+ SEQ_printf(m, "\n");
}
-static void timer_list_show_tickdevices(struct seq_file *m)
+static void timer_list_show_tickdevices_header(struct seq_file *m)
{
- int cpu;
-
#ifdef CONFIG_GENERIC_CLOCKEVENTS_BROADCAST
- print_tickdevice(m, tick_get_broadcast_device());
+ print_tickdevice(m, tick_get_broadcast_device(), -1);
SEQ_printf(m, "tick_broadcast_mask: %08lx\n",
- tick_get_broadcast_mask()->bits[0]);
+ cpumask_bits(tick_get_broadcast_mask())[0]);
#ifdef CONFIG_TICK_ONESHOT
SEQ_printf(m, "tick_broadcast_oneshot_mask: %08lx\n",
- tick_get_broadcast_oneshot_mask()->bits[0]);
+ cpumask_bits(tick_get_broadcast_oneshot_mask())[0]);
#endif
SEQ_printf(m, "\n");
#endif
- for_each_online_cpu(cpu)
- print_tickdevice(m, tick_get_device(cpu));
- SEQ_printf(m, "\n");
}
-#else
-static void timer_list_show_tickdevices(struct seq_file *m) { }
#endif
+static inline void timer_list_header(struct seq_file *m, u64 now)
+{
+ SEQ_printf(m, "Timer List Version: v0.7\n");
+ SEQ_printf(m, "HRTIMER_MAX_CLOCK_BASES: %d\n", HRTIMER_MAX_CLOCK_BASES);
+ SEQ_printf(m, "now at %Ld nsecs\n", (unsigned long long)now);
+ SEQ_printf(m, "\n");
+}
+
static int timer_list_show(struct seq_file *m, void *v)
{
+ struct timer_list_iter *iter = v;
+
+ if (iter->cpu == -1 && !iter->second_pass)
+ timer_list_header(m, iter->now);
+ else if (!iter->second_pass)
+ print_cpu(m, iter->cpu, iter->now);
+#ifdef CONFIG_GENERIC_CLOCKEVENTS
+ else if (iter->cpu == -1 && iter->second_pass)
+ timer_list_show_tickdevices_header(m);
+ else
+ print_tickdevice(m, tick_get_device(iter->cpu), iter->cpu);
+#endif
+ return 0;
+}
+
+void sysrq_timer_list_show(void)
+{
u64 now = ktime_to_ns(ktime_get());
int cpu;
- SEQ_printf(m, "Timer List Version: v0.3\n");
- SEQ_printf(m, "HRTIMER_MAX_CLOCK_BASES: %d\n", HRTIMER_MAX_CLOCK_BASES);
- SEQ_printf(m, "now at %Ld nsecs\n", (unsigned long long)now);
+ timer_list_header(NULL, now);
for_each_online_cpu(cpu)
- print_cpu(m, cpu, now);
+ print_cpu(NULL, cpu, now);
- SEQ_printf(m, "\n");
- timer_list_show_tickdevices(m);
+#ifdef CONFIG_GENERIC_CLOCKEVENTS
+ timer_list_show_tickdevices_header(NULL);
+ for_each_online_cpu(cpu)
+ print_tickdevice(NULL, tick_get_device(cpu), cpu);
+#endif
+ return;
+}
- return 0;
+static void *move_iter(struct timer_list_iter *iter, loff_t offset)
+{
+ for (; offset; offset--) {
+ iter->cpu = cpumask_next(iter->cpu, cpu_online_mask);
+ if (iter->cpu >= nr_cpu_ids) {
+#ifdef CONFIG_GENERIC_CLOCKEVENTS
+ if (!iter->second_pass) {
+ iter->cpu = -1;
+ iter->second_pass = true;
+ } else
+ return NULL;
+#else
+ return NULL;
+#endif
+ }
+ }
+ return iter;
}
-void sysrq_timer_list_show(void)
+static void *timer_list_start(struct seq_file *file, loff_t *offset)
{
- timer_list_show(NULL, NULL);
+ struct timer_list_iter *iter = file->private;
+
+ if (!*offset)
+ iter->now = ktime_to_ns(ktime_get());
+ iter->cpu = -1;
+ iter->second_pass = false;
+ return move_iter(iter, *offset);
}
+static void *timer_list_next(struct seq_file *file, void *v, loff_t *offset)
+{
+ struct timer_list_iter *iter = file->private;
+ ++*offset;
+ return move_iter(iter, 1);
+}
+
+static void timer_list_stop(struct seq_file *seq, void *v)
+{
+}
+
+static const struct seq_operations timer_list_sops = {
+ .start = timer_list_start,
+ .next = timer_list_next,
+ .stop = timer_list_stop,
+ .show = timer_list_show,
+};
+
static int timer_list_open(struct inode *inode, struct file *filp)
{
- return single_open(filp, timer_list_show, NULL);
+ return seq_open_private(filp, &timer_list_sops,
+ sizeof(struct timer_list_iter));
}
-static struct file_operations timer_list_fops = {
+static const struct file_operations timer_list_fops = {
.open = timer_list_open,
.read = seq_read,
.llseek = seq_lseek,
- .release = single_release,
+ .release = seq_release_private,
};
static int __init init_timer_list_procfs(void)
{
struct proc_dir_entry *pe;
- pe = create_proc_entry("timer_list", 0644, NULL);
+ pe = proc_create("timer_list", 0444, NULL, &timer_list_fops);
if (!pe)
return -ENOMEM;
-
- pe->proc_fops = &timer_list_fops;
-
return 0;
}
__initcall(init_timer_list_procfs);
generated by cgit v1.2.3-70-g09d2 (git 2.46.0) at 2025-11-10 03:30:52 +0000