Gitweb:     
http://git.kernel.org/git/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commit;h=289f480af87e45f7a6de6ba9b4c061c2e259fe98
Commit:     289f480af87e45f7a6de6ba9b4c061c2e259fe98
Parent:     82f67cd9fca8c8762c15ba7ed0d5747588c1e221
Author:     Ingo Molnar <[EMAIL PROTECTED]>
AuthorDate: Fri Feb 16 01:28:15 2007 -0800
Committer:  Linus Torvalds <[EMAIL PROTECTED]>
CommitDate: Fri Feb 16 08:13:59 2007 -0800

    [PATCH] Add debugging feature /proc/timer_list
    
    add /proc/timer_list, which prints all currently pending (high-res) timers,
    all clock-event sources and their parameters in a human-readable form.
    
    Sample output:
    
    Timer List Version: v0.1
    HRTIMER_MAX_CLOCK_BASES: 2
    now at 4246046273872 nsecs
    
    cpu: 0
     clock 0:
      .index:      0
      .resolution: 1 nsecs
      .get_time:   ktime_get_real
      .offset:     1273998312645738432 nsecs
    active timers:
     clock 1:
      .index:      1
      .resolution: 1 nsecs
      .get_time:   ktime_get
      .offset:     0 nsecs
    active timers:
     #0: <f5a90ec8>, hrtimer_sched_tick, hrtimer_stop_sched_tick, swapper/0
     # expires at 4246432689566 nsecs [in 386415694 nsecs]
     #1: <f5a90ec8>, hrtimer_wakeup, do_nanosleep, pcscd/2050
     # expires at 4247018194689 nsecs [in 971920817 nsecs]
     #2: <f5a90ec8>, hrtimer_wakeup, do_nanosleep, irqbalance/1909
     # expires at 4247351358392 nsecs [in 1305084520 nsecs]
     #3: <f5a90ec8>, hrtimer_wakeup, do_nanosleep, crond/2157
     # expires at 4249097614968 nsecs [in 3051341096 nsecs]
     #4: <f5a90ec8>, it_real_fn, do_setitimer, syslogd/1888
     # expires at 4251329900926 nsecs [in 5283627054 nsecs]
      .expires_next   : 4246432689566 nsecs
      .hres_active    : 1
      .check_clocks   : 0
      .nr_events      : 31306
      .idle_tick      : 4246020791890 nsecs
      .tick_stopped   : 1
      .idle_jiffies   : 986504
      .idle_calls     : 40700
      .idle_sleeps    : 36014
      .idle_entrytime : 4246019418883 nsecs
      .idle_sleeptime : 4178181972709 nsecs
    
    cpu: 1
     clock 0:
      .index:      0
      .resolution: 1 nsecs
      .get_time:   ktime_get_real
      .offset:     1273998312645738432 nsecs
    active timers:
     clock 1:
      .index:      1
      .resolution: 1 nsecs
      .get_time:   ktime_get
      .offset:     0 nsecs
    active timers:
     #0: <f5a90ec8>, hrtimer_sched_tick, hrtimer_restart_sched_tick, swapper/0
     # expires at 4246050084568 nsecs [in 3810696 nsecs]
     #1: <f5a90ec8>, hrtimer_wakeup, do_nanosleep, atd/2227
     # expires at 4261010635003 nsecs [in 14964361131 nsecs]
     #2: <f5a90ec8>, hrtimer_wakeup, do_nanosleep, smartd/2332
     # expires at 5469485798970 nsecs [in 1223439525098 nsecs]
      .expires_next   : 4246050084568 nsecs
      .hres_active    : 1
      .check_clocks   : 0
      .nr_events      : 24043
      .idle_tick      : 4246046084568 nsecs
      .tick_stopped   : 0
      .idle_jiffies   : 986510
      .idle_calls     : 26360
      .idle_sleeps    : 22551
      .idle_entrytime : 4246043874339 nsecs
      .idle_sleeptime : 4170763761184 nsecs
    
    tick_broadcast_mask: 00000003
    event_broadcast_mask: 00000001
    
    CPU#0's local event device:
    
    Clock Event Device: lapic
     capabilities:   0000000e
     max_delta_ns:   807385544
     min_delta_ns:   1443
     mult:           44624025
     shift:          32
     set_next_event: lapic_next_event
     set_mode:       lapic_timer_setup
     event_handler:  hrtimer_interrupt
      .installed:  1
      .expires:    4246432689566 nsecs
    
    CPU#1's local event device:
    
    Clock Event Device: lapic
     capabilities:   0000000e
     max_delta_ns:   807385544
     min_delta_ns:   1443
     mult:           44624025
     shift:          32
     set_next_event: lapic_next_event
     set_mode:       lapic_timer_setup
     event_handler:  hrtimer_interrupt
      .installed:  1
      .expires:    4246050084568 nsecs
    
    Clock Event Device: hpet
     capabilities:   00000007
     max_delta_ns:   2147483647
     min_delta_ns:   3352
     mult:           61496110
     shift:          32
     set_next_event: hpet_next_event
     set_mode:       hpet_set_mode
     event_handler:  handle_nextevt_broadcast
    
    Signed-off-by: Ingo Molnar <[EMAIL PROTECTED]>
    Signed-off-by: Thomas Gleixner <[EMAIL PROTECTED]>
    Cc: john stultz <[EMAIL PROTECTED]>
    Cc: Roman Zippel <[EMAIL PROTECTED]>
    Signed-off-by: Andrew Morton <[EMAIL PROTECTED]>
    Signed-off-by: Linus Torvalds <[EMAIL PROTECTED]>
---
 include/linux/tick.h         |   11 ++
 kernel/time/Makefile         |    2 +-
 kernel/time/tick-broadcast.c |   21 +++
 kernel/time/tick-common.c    |    8 ++
 kernel/time/tick-sched.c     |    5 +
 kernel/time/timer_list.c     |  287 ++++++++++++++++++++++++++++++++++++++++++
 6 files changed, 333 insertions(+), 1 deletions(-)

diff --git a/include/linux/tick.h b/include/linux/tick.h
index cf435e4..9a7252e 100644
--- a/include/linux/tick.h
+++ b/include/linux/tick.h
@@ -59,6 +59,7 @@ struct tick_sched {
 
 extern void __init tick_init(void);
 extern int tick_is_oneshot_available(void);
+extern struct tick_device *tick_get_device(int cpu);
 
 # ifdef CONFIG_HIGH_RES_TIMERS
 extern int tick_init_highres(void);
@@ -69,6 +70,16 @@ extern void tick_cancel_sched_timer(int cpu);
 static inline void tick_cancel_sched_timer(int cpu) { }
 # endif /* HIGHRES */
 
+# ifdef CONFIG_GENERIC_CLOCKEVENTS_BROADCAST
+extern struct tick_device *tick_get_broadcast_device(void);
+extern cpumask_t *tick_get_broadcast_mask(void);
+
+#  ifdef CONFIG_TICK_ONESHOT
+extern cpumask_t *tick_get_broadcast_oneshot_mask(void);
+#  endif
+
+# endif /* BROADCAST */
+
 # ifdef CONFIG_TICK_ONESHOT
 extern void tick_clock_notify(void);
 extern int tick_check_oneshot_change(int allow_nohz);
diff --git a/kernel/time/Makefile b/kernel/time/Makefile
index 252b4b5..93bccba 100644
--- a/kernel/time/Makefile
+++ b/kernel/time/Makefile
@@ -1,4 +1,4 @@
-obj-y += ntp.o clocksource.o jiffies.o
+obj-y += ntp.o clocksource.o jiffies.o timer_list.o
 
 obj-$(CONFIG_GENERIC_CLOCKEVENTS)              += clockevents.o
 obj-$(CONFIG_GENERIC_CLOCKEVENTS)              += tick-common.o
diff --git a/kernel/time/tick-broadcast.c b/kernel/time/tick-broadcast.c
index 8314ecb..12b3efe 100644
--- a/kernel/time/tick-broadcast.c
+++ b/kernel/time/tick-broadcast.c
@@ -32,6 +32,19 @@ static cpumask_t tick_broadcast_mask;
 static DEFINE_SPINLOCK(tick_broadcast_lock);
 
 /*
+ * Debugging: see timer_list.c
+ */
+struct tick_device *tick_get_broadcast_device(void)
+{
+       return &tick_broadcast_device;
+}
+
+cpumask_t *tick_get_broadcast_mask(void)
+{
+       return &tick_broadcast_mask;
+}
+
+/*
  * Start the device in periodic mode
  */
 static void tick_broadcast_start_periodic(struct clock_event_device *bc)
@@ -275,6 +288,14 @@ void tick_shutdown_broadcast(unsigned int *cpup)
 
 static cpumask_t tick_broadcast_oneshot_mask;
 
+/*
+ * Debugging: see timer_list.c
+ */
+cpumask_t *tick_get_broadcast_oneshot_mask(void)
+{
+       return &tick_broadcast_oneshot_mask;
+}
+
 static int tick_broadcast_set_event(ktime_t expires, int force)
 {
        struct clock_event_device *bc = tick_broadcast_device.evtdev;
diff --git a/kernel/time/tick-common.c b/kernel/time/tick-common.c
index c35d449..4500e34 100644
--- a/kernel/time/tick-common.c
+++ b/kernel/time/tick-common.c
@@ -34,6 +34,14 @@ ktime_t tick_period;
 static int tick_do_timer_cpu = -1;
 DEFINE_SPINLOCK(tick_device_lock);
 
+/*
+ * Debugging: see timer_list.c
+ */
+struct tick_device *tick_get_device(int cpu)
+{
+       return &per_cpu(tick_cpu_device, cpu);
+}
+
 /**
  * tick_is_oneshot_available - check for a oneshot capable event device
  */
diff --git a/kernel/time/tick-sched.c b/kernel/time/tick-sched.c
index 99d35e2..95e41f7 100644
--- a/kernel/time/tick-sched.c
+++ b/kernel/time/tick-sched.c
@@ -33,6 +33,11 @@ static DEFINE_PER_CPU(struct tick_sched, tick_cpu_sched);
  */
 static ktime_t last_jiffies_update;
 
+struct tick_sched *tick_get_tick_sched(int cpu)
+{
+       return &per_cpu(tick_cpu_sched, cpu);
+}
+
 /*
  * Must be called with interrupts disabled !
  */
diff --git a/kernel/time/timer_list.c b/kernel/time/timer_list.c
new file mode 100644
index 0000000..f82c635
--- /dev/null
+++ b/kernel/time/timer_list.c
@@ -0,0 +1,287 @@
+/*
+ * kernel/time/timer_list.c
+ *
+ * List pending timers
+ *
+ * Copyright(C) 2006, Red Hat, Inc., Ingo Molnar
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+
+#include <linux/proc_fs.h>
+#include <linux/module.h>
+#include <linux/spinlock.h>
+#include <linux/sched.h>
+#include <linux/seq_file.h>
+#include <linux/kallsyms.h>
+#include <linux/tick.h>
+
+#include <asm/uaccess.h>
+
+typedef void (*print_fn_t)(struct seq_file *m, unsigned int *classes);
+
+DECLARE_PER_CPU(struct hrtimer_cpu_base, hrtimer_bases);
+
+/*
+ * This allows printing both to /proc/timer_list and
+ * to the console (on SysRq-Q):
+ */
+#define SEQ_printf(m, x...)                    \
+ do {                                          \
+       if (m)                                  \
+               seq_printf(m, x);               \
+       else                                    \
+               printk(x);                      \
+ } while (0)
+
+static void print_name_offset(struct seq_file *m, void *sym)
+{
+       unsigned long addr = (unsigned long)sym;
+       char namebuf[KSYM_NAME_LEN+1];
+       unsigned long size, offset;
+       const char *sym_name;
+       char *modname;
+
+       sym_name = kallsyms_lookup(addr, &size, &offset, &modname, namebuf);
+       if (sym_name)
+               SEQ_printf(m, "%s", sym_name);
+       else
+               SEQ_printf(m, "<%p>", sym);
+}
+
+static void
+print_timer(struct seq_file *m, 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);
+       SEQ_printf(m, ", ");
+       print_name_offset(m, timer->function);
+       SEQ_printf(m, ", S:%02lx", timer->state);
+#ifdef CONFIG_TIMER_STATS
+       SEQ_printf(m, ", ");
+       print_name_offset(m, timer->start_site);
+       memcpy(tmp, timer->start_comm, TASK_COMM_LEN);
+       tmp[TASK_COMM_LEN] = 0;
+       SEQ_printf(m, ", %s/%d", tmp, timer->start_pid);
+#endif
+       SEQ_printf(m, "\n");
+       SEQ_printf(m, " # expires at %Ld nsecs [in %Ld nsecs]\n",
+               (unsigned long long)ktime_to_ns(timer->expires),
+               (unsigned long long)(ktime_to_ns(timer->expires) - now));
+}
+
+static void
+print_active_timers(struct seq_file *m, struct hrtimer_clock_base *base,
+                   u64 now)
+{
+       struct hrtimer *timer, tmp;
+       unsigned long next = 0, i;
+       struct rb_node *curr;
+       unsigned long flags;
+
+next_one:
+       i = 0;
+       spin_lock_irqsave(&base->cpu_base->lock, flags);
+
+       curr = base->first;
+       /*
+        * 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);
+               i++;
+       }
+
+       if (curr) {
+
+               timer = rb_entry(curr, struct hrtimer, node);
+               tmp = *timer;
+               spin_unlock_irqrestore(&base->cpu_base->lock, flags);
+
+               print_timer(m, &tmp, i, now);
+               next++;
+               goto next_one;
+       }
+       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, "  .index:      %d\n",
+                       base->index);
+       SEQ_printf(m, "  .resolution: %Ld nsecs\n",
+                       (unsigned long long)ktime_to_ns(base->resolution));
+       SEQ_printf(m,   "  .get_time:   ");
+       print_name_offset(m, base->get_time);
+       SEQ_printf(m,   "\n");
+#ifdef CONFIG_HIGH_RES_TIMERS
+       SEQ_printf(m, "  .offset:     %Ld nsecs\n",
+                       ktime_to_ns(base->offset));
+#endif
+       SEQ_printf(m,   "active timers:\n");
+       print_active_timers(m, base, now);
+}
+
+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, "\ncpu: %d\n", cpu);
+       for (i = 0; i < HRTIMER_MAX_CLOCK_BASES; i++) {
+               SEQ_printf(m, " clock %d:\n", i);
+               print_base(m, cpu_base->clock_base + i, now);
+       }
+#define P(x) \
+       SEQ_printf(m, "  .%-15s: %Ld\n", #x, (u64)(cpu_base->x))
+#define P_ns(x) \
+       SEQ_printf(m, "  .%-15s: %Ld nsecs\n", #x, \
+               (u64)(ktime_to_ns(cpu_base->x)))
+
+#ifdef CONFIG_HIGH_RES_TIMERS
+       P_ns(expires_next);
+       P(hres_active);
+       P(nr_events);
+#endif
+#undef P
+#undef P_ns
+
+#ifdef CONFIG_TICK_ONESHOT
+# define P(x) \
+       SEQ_printf(m, "  .%-15s: %Ld\n", #x, (u64)(ts->x))
+# define P_ns(x) \
+       SEQ_printf(m, "  .%-15s: %Ld nsecs\n", #x, \
+               (u64)(ktime_to_ns(ts->x)))
+       {
+               struct tick_sched *ts = tick_get_tick_sched(cpu);
+               P(nohz_mode);
+               P_ns(idle_tick);
+               P(tick_stopped);
+               P(idle_jiffies);
+               P(idle_calls);
+               P(idle_sleeps);
+               P_ns(idle_entrytime);
+               P_ns(idle_sleeptime);
+               P(last_jiffies);
+               P(next_jiffies);
+               P_ns(idle_expires);
+               SEQ_printf(m, "jiffies: %Ld\n", (u64)jiffies);
+       }
+#endif
+
+#undef P
+#undef P_ns
+}
+
+#ifdef CONFIG_GENERIC_CLOCKEVENTS
+static void
+print_tickdevice(struct seq_file *m, struct tick_device *td)
+{
+       struct clock_event_device *dev = td->evtdev;
+
+       SEQ_printf(m, "\nTick Device: mode:     %d\n", td->mode);
+
+       SEQ_printf(m, "Clock Event Device: ");
+       if (!dev) {
+               SEQ_printf(m, "<NULL>\n");
+               return;
+       }
+       SEQ_printf(m, "%s\n", dev->name);
+       SEQ_printf(m, " max_delta_ns:   %ld\n", dev->max_delta_ns);
+       SEQ_printf(m, " min_delta_ns:   %ld\n", dev->min_delta_ns);
+       SEQ_printf(m, " mult:           %ld\n", dev->mult);
+       SEQ_printf(m, " shift:          %d\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));
+
+       SEQ_printf(m, " set_next_event: ");
+       print_name_offset(m, dev->set_next_event);
+       SEQ_printf(m, "\n");
+
+       SEQ_printf(m, " set_mode:       ");
+       print_name_offset(m, dev->set_mode);
+       SEQ_printf(m, "\n");
+
+       SEQ_printf(m, " event_handler:  ");
+       print_name_offset(m, dev->event_handler);
+       SEQ_printf(m, "\n");
+}
+
+static void timer_list_show_tickdevices(struct seq_file *m)
+{
+       int cpu;
+
+#ifdef CONFIG_GENERIC_CLOCKEVENTS_BROADCAST
+       print_tickdevice(m, tick_get_broadcast_device());
+       SEQ_printf(m, "tick_broadcast_mask: %08lx\n",
+                  tick_get_broadcast_mask()->bits[0]);
+#ifdef CONFIG_TICK_ONESHOT
+       SEQ_printf(m, "tick_broadcast_oneshot_mask: %08lx\n",
+                  tick_get_broadcast_oneshot_mask()->bits[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 int timer_list_show(struct seq_file *m, void *v)
+{
+       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);
+
+       for_each_online_cpu(cpu)
+               print_cpu(m, cpu, now);
+
+       SEQ_printf(m, "\n");
+       timer_list_show_tickdevices(m);
+
+       return 0;
+}
+
+void sysrq_timer_list_show(void)
+{
+       timer_list_show(NULL, NULL);
+}
+
+static int timer_list_open(struct inode *inode, struct file *filp)
+{
+       return single_open(filp, timer_list_show, NULL);
+}
+
+static struct file_operations timer_list_fops = {
+       .open           = timer_list_open,
+       .read           = seq_read,
+       .llseek         = seq_lseek,
+       .release        = seq_release,
+};
+
+static int __init init_timer_list_procfs(void)
+{
+       struct proc_dir_entry *pe;
+
+       pe = create_proc_entry("timer_list", 0644, NULL);
+       if (!pe)
+               return -ENOMEM;
+
+       pe->proc_fops = &timer_list_fops;
+
+       return 0;
+}
+__initcall(init_timer_list_procfs);
-
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