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SubjectRe: [PATCH] Display active jiffie timers in /proc/timer_list
Joe,

On Tue, 25 Nov 2008, Joe Korty wrote:
> Add to /proc/timer_list a display of the active jiffie timers.
>
> Tested on i386 and x86_64, with 'less /proc/timer_list' and
> through SysRq-Q.
>
> 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 2008-11-25 11:59:07.000000000 -0500
> +++ 2.6.28-rc6/kernel/timer.c 2008-11-25 13:49:05.000000000 -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 +1570,87 @@
> open_softirq(TIMER_SOFTIRQ, run_timer_softirq);
> }
>
> +#if defined(CONFIG_PROC_FS) || defined(CONFIG_MAGIC_SYSRQ)

This belongs into kernel/time/timer_list.c and there is no need to
copy that code around.

> +void print_cpu_jtimers(struct seq_file *m, int cpu)
> +{
> + int i;
> + struct tvec_base *base = per_cpu(tvec_bases, cpu);
> +
> + SEQ_printf(m, "active jiffie timers:\n");
> + spin_lock_irq(&base->lock);

Yuck. We really do _NOT_ stop everything just to print timers. Check
the hrtimer print code in timer_list.c

> Index: 2.6.28-rc6/kernel/time/timer_list.c
> ===================================================================
> --- 2.6.28-rc6.orig/kernel/time/timer_list.c 2008-11-25 11:59:07.000000000 -0500
> +++ 2.6.28-rc6/kernel/time/timer_list.c 2008-11-25 13:47:30.000000000 -0500
> @@ -17,6 +17,7 @@
> #include <linux/seq_file.h>
> #include <linux/kallsyms.h>
> #include <linux/tick.h>
> +#include <linux/jiffies.h>
>
> #include <asm/uaccess.h>
>
> @@ -139,6 +140,7 @@
> SEQ_printf(m, " clock %d:\n", i);
> print_base(m, cpu_base->clock_base + i, now);
> }
> +

random whitespace change

> #define P(x) \
> SEQ_printf(m, " .%-15s: %Lu\n", #x, \
> (unsigned long long)(cpu_base->x))
> @@ -176,9 +178,11 @@
> P(last_jiffies);
> P(next_jiffies);
> P_ns(idle_expires);
> - SEQ_printf(m, "jiffies: %Lu\n",
> + SEQ_printf(m, "jiffies: %llu (0x%llx)\n",
> + (unsigned long long)jiffies,
> (unsigned long long)jiffies);

The exact purpose of this change ?

> @@ -286,7 +290,7 @@
> {
> struct proc_dir_entry *pe;
>
> - pe = proc_create("timer_list", 0644, NULL, &timer_list_fops);
> + pe = proc_create("timer_list", 0444, NULL, &timer_list_fops);
> if (!pe)
> return -ENOMEM;
> return 0;

Correct, but unrelated $subject. Separate patch please.

Thanks,

tglx


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