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Subject[PATCH] Timer Top was: i386 No-Idle-Hz aka Dynamic-Ticks 3
Hi,

Here we have some support to have more tests on Dynamic Tick.
We have some functions that exports timers information to a proc entry
(/proc/top_info), in a kernel patch and a script that handles this
info and give some output to analyse. We tried to make it less
intrusive as possible.

It is based in suggestions from Tony Lindgren.

It is experimental and should evolve.

Must be applied after 2.6.13-rc5-dtck-3.patch and 2.6.13-rc5.

Usage: with kernel compiled with attached patch: "perl timer_top.pl
5", to have refresh time of 5s.

Regards,

Daniel Petrini
--
10LE - Linux Lab
Instituto Nokia de Tecnologia - INdT
Manaus - Brazil
diff -uprN linux-2.6.12-orig/kernel/Makefile linux-dyn-tick/kernel/Makefile
--- linux-2.6.12-orig/kernel/Makefile 2005-08-03 23:50:26.000000000 -0400
+++ linux-dyn-tick/kernel/Makefile 2005-08-04 16:56:14.000000000 -0400
@@ -7,7 +7,7 @@ obj-y = sched.o fork.o exec_domain.o
sysctl.o capability.o ptrace.o timer.o user.o \
signal.o sys.o kmod.o workqueue.o pid.o \
rcupdate.o intermodule.o extable.o params.o posix-timers.o \
- kthread.o wait.o kfifo.o sys_ni.o posix-cpu-timers.o
+ kthread.o wait.o kfifo.o sys_ni.o posix-cpu-timers.o timer_top.o

obj-$(CONFIG_FUTEX) += futex.o
obj-$(CONFIG_GENERIC_ISA_DMA) += dma.o
diff -uprN linux-2.6.12-orig/kernel/timer.c linux-dyn-tick/kernel/timer.c
--- linux-2.6.12-orig/kernel/timer.c 2005-08-03 23:50:27.000000000 -0400
+++ linux-dyn-tick/kernel/timer.c 2005-08-04 16:56:27.000000000 -0400
@@ -508,6 +508,8 @@ static inline void __run_timers(tvec_bas
}

#ifdef CONFIG_NO_IDLE_HZ
+extern struct timer_top_info top_info;
+extern int account_timer(unsigned int function, struct timer_top_info * top_info);
/*
* Find out when the next timer event is due to happen. This
* is used on S/390 to stop all activity when a cpus is idle.
@@ -571,6 +573,7 @@ found:
expires = nte->expires;
}
}
+ account_timer((unsigned int)nte->function, &top_info);
spin_unlock(&base->t_base.lock);
return expires;
}
diff -uprN linux-2.6.12-orig/kernel/timer_top.c linux-dyn-tick/kernel/timer_top.c
--- linux-2.6.12-orig/kernel/timer_top.c 1969-12-31 20:00:00.000000000 -0400
+++ linux-dyn-tick/kernel/timer_top.c 2005-08-04 16:51:36.000000000 -0400
@@ -0,0 +1,101 @@
+/*
+ * kernel/timer_top.c
+ *
+ * Export Timers information to /proc/top_info
+ *
+ * Copyright (C) 2005 Instituto Nokia de Tecnologia - INdT - Manaus
+ * Written by Daniel Petrini <d.pensator@gmail.com>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+
+
+#include <linux/list.h>
+#include <linux/proc_fs.h>
+#include <linux/module.h>
+
+static LIST_HEAD(timer_list);
+
+struct timer_top_info {
+ unsigned int func_pointer;
+ unsigned int long counter;
+ struct list_head list;
+};
+
+struct timer_top_info top_info;
+
+int account_timer(unsigned int function, struct timer_top_info * top_info)
+{
+ struct timer_top_info *top;
+
+ list_for_each_entry (top, &timer_list, list) {
+ /* if it is in the list increment its count */
+ if (top->func_pointer == function) {
+ top->counter += 1;
+ return 0;
+ }
+ }
+
+ /* if you are here then it didnt find so inserts in the list */
+
+ top = kmalloc(sizeof(struct timer_top_info), GFP_KERNEL);
+ if (!top)
+ return -ENOMEM;
+ top->func_pointer = function;
+ top->counter = 1;
+ list_add(&top->list, &timer_list);
+
+ return 0;
+}
+
+EXPORT_SYMBOL(account_timer);
+
+struct top_info_poll {
+ char value[18];
+};
+
+struct top_info_poll top_info_poll_dt;
+struct proc_dir_entry *top_info_file;
+
+static int proc_read_top_info(char *page, char **start, off_t off,
+ int count, int *eof, void *data)
+{
+ char aux[18];
+ struct timer_top_info *top;
+
+ struct top_info_poll *info_poll_data=(struct top_info_poll *)data;
+
+ sprintf(page, "Function counter - %s\n", info_poll_data->value);
+
+ list_for_each_entry (top, &timer_list, list) {
+ sprintf(aux, "%x %lu\n", top->func_pointer, top->counter);
+ strcat(page, aux);
+ }
+
+ return strlen(page);
+
+}
+
+static int init_top_info(void)
+{
+ top_info_file = create_proc_entry("top_info", 0666, NULL);
+ if(top_info_file == NULL) {
+ return -ENOMEM;
+ }
+
+ strcpy(top_info_poll_dt.value, "Timer Top v0.9.1");
+
+ top_info_file->data = &top_info_poll_dt;
+ top_info_file->read_proc = &proc_read_top_info;
+ top_info_file->owner = THIS_MODULE;
+
+ return 0;
+}
+
+module_init(init_top_info);
+//module_exit();
+
+
+[unhandled content-type:application/x-perl]
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