Re: [PATCH] create /proc/timer-wheel-list

Index: 2.6.28-rc6/kernel/timer.c
===================================================================

--- 2.6.28-rc6.orig/kernel/timer.c      2008-11-21 17:02:04.000000000 -0500
+++ 2.6.28-rc6/kernel/timer.c   2008-11-21 17:04:25.000000000 -0500

@@ -36,6 +36,8 @@
 #include <linux/syscalls.h>
 #include <linux/delay.h>
 #include <linux/tick.h>
+#include <linux/proc_fs.h>
+#include <linux/seq_file.h>
 #include <linux/kallsyms.h>

 #include <asm/uaccess.h>

@@ -1568,6 +1570,113 @@
       open_softirq(TIMER_SOFTIRQ, run_timer_softirq);
 }

+#ifdef CONFIG_PROC_FS
+
+static void seq_printf_symbol(struct seq_file *m, void *symaddr, int width)
+{
+       char symname[KSYM_NAME_LEN];
+       int stat, len = m->count;
+
+       if (lookup_symbol_name((unsigned long)symaddr, symname) < 0)
+               stat = seq_printf(m, "<%p>", symaddr);
+       else
+               stat = seq_printf(m, "%s", symname);
+       if (width && stat == 0) {
+               len += (width - m->count);
+               if (len > 0)
+                       seq_printf(m, "%*s", len, " ");
+       }
+}
+
+static void print_single_timer(struct seq_file *m, struct timer_list *timer)
+{
+       unsigned long base_jiffies = tbase_get_base(timer->base)->timer_jiffies;
+
+       seq_printf(m, " %p - ", (void *)(timer->expires - base_jiffies));
+       seq_printf_symbol(m, timer->function, 24);
+       seq_printf(m, " (data ");
+       seq_printf_symbol(m, (void *)(timer->data), 24);
+       seq_printf(m, ")");
+#ifdef CONFIG_TIMER_STATS
+       seq_printf(m, " from ");
+       seq_printf_symbol(m, timer->start_site, 28);
+       seq_printf(m, " %*s/%d",
+               TASK_COMM_LEN, timer->start_comm,
+               timer->start_pid);
+#endif
+       seq_printf(m, "\n");
+}
+
+static void print_timer_list(struct seq_file *m, struct list_head *head)
+{
+       struct timer_list *timer;
+       struct list_head *item;
+
+       for (item = head->next; item != head; item = item->next) {
+               timer = list_entry(item, struct timer_list, entry);
+               print_single_timer(m, timer);
+       }
+}
+
+static void print_cpu_timers(struct seq_file *m, int cpu)
+{
+       int i;
+       struct tvec_base *base = per_cpu(tvec_bases, cpu);
+
+       spin_lock_irq(&base->lock);
+       seq_printf(m, "\ncpu: %d, base jiffies: %p\n\n",
+               cpu, (void *)(base->timer_jiffies));
+
+       for (i = 0; i < TVR_SIZE; i++)
+               print_timer_list(m, base->tv1.vec + i);
+       for (i = 0; i < TVN_SIZE; i++) {
+               print_timer_list(m, base->tv2.vec + i);
+               print_timer_list(m, base->tv3.vec + i);
+               print_timer_list(m, base->tv4.vec + i);
+               print_timer_list(m, base->tv5.vec + i);
+       }
+       spin_unlock_irq(&base->lock);
+}
+
+static int timer_list_show(struct seq_file *m, void *v)
+{
+       int cpu;
+
+       seq_printf(m, "Timer Wheel List Version: 1\n");
+       seq_printf(m, "Jiffies: %px\n", (void *)jiffies);
+
+       for_each_online_cpu(cpu) {
+               print_cpu_timers(m, cpu);
+       }
+
+       return 0;
+}
+
+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        = single_release,
+};
+
+static int __init init_timer_list_procfs(void)
+{
+       struct proc_dir_entry *pe;
+
+       pe = proc_create("timer_wheel_list", 0444, NULL, &timer_list_fops);
+       if (!pe)
+               return -ENOMEM;
+       return 0;
+}
+late_initcall(init_timer_list_procfs);
+
+#endif /* CONFIG_PROC_FS */
+
 /**
 * msleep - sleep safely even with waitqueue interruptions
 * @msecs: Time in milliseconds to sleep for
--

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