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Message-ID: <20081121221113.GA13566@tsunami.ccur.com>
Date: Fri, 21 Nov 2008 17:11:13 -0500
From: Joe Korty <joe.korty@...r.com>
To: Ingo Molnar <mingo@...e.hu>, Thomas Gleixner <tglx@...utronix.de>
Cc: LKML <linux-kernel@...r.kernel.org>
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@...r.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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