Messages in this thread Patch in this message | | | Date | Fri, 21 Nov 2008 17:11:13 -0500 | From | Joe Korty <> | Subject | [PATCH] create /proc/timer-wheel-list |
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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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