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    Subject[PATCH] create /proc/timer-wheel-list
    Create /proc/timer_wheel_list.

    This does for the timer wheel what /proc/timer_list
    does for hrtimers -- provide a way of displaying what
    timers are running on what cpus, and their attributes.

    Signed-off-by: Joe Korty <joe.korty@ccur.com>

    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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