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    SubjectRe: PATCH: Create new LED trigger for CPU activity (ledtrig-cpu) (UPDATED)
    Here is a new version of the patch, incorporating code style tips from
    Randy Dunlap <rdunlap@xenotime.net>, and based on 2.6.17-git25, rather
    than 2.6.17.1.

    I noticed that there's a Heartbeat LED trigger in the git version. I
    hope this isn't too similar.

    --
    Thomas Tuttle
    http://thinkinginbinary.webhop.net/
    thinkinginbinary@gmail.com
    AIM: thinkinginbinary
    diff -udrN linux-2.6.17-git25/drivers/leds/Kconfig linux-2.6.17-git25-mine/drivers/leds/Kconfig
    --- linux-2.6.17-git25/drivers/leds/Kconfig 2006-07-05 22:11:45.000000000 -0400
    +++ linux-2.6.17-git25-mine/drivers/leds/Kconfig 2006-07-05 22:42:58.000000000 -0400
    @@ -93,6 +93,41 @@
    This allows LEDs to be controlled by IDE disk activity.
    If unsure, say Y.

    +config LEDS_TRIGGER_CPU
    + tristate "LED CPU Trigger"
    + depends LEDS_TRIGGERS
    + help
    + This allows LEDs to be controlled by CPU activity.
    + If unsure, say Y.
    +
    +config LEDS_TRIGGER_CPU_INCLUDE_USER
    + bool "Include user time in CPU trigger"
    + depends LEDS_TRIGGER_CPU
    + default y
    + help
    + This option makes user CPU time cause the CPU trigger to activate.
    +
    +config LEDS_TRIGGER_CPU_INCLUDE_NICE
    + bool "Include nice time in CPU trigger"
    + depends LEDS_TRIGGER_CPU
    + default n
    + help
    + This option makes nice CPU time cause the CPU trigger to activate.
    +
    +config LEDS_TRIGGER_CPU_INCLUDE_SYSTEM
    + bool "Include system time in CPU trigger"
    + depends LEDS_TRIGGER_CPU
    + default y
    + help
    + This option makes system CPU time cause the CPU trigger to activate.
    +
    +config LEDS_TRIGGER_CPU_INCLUDE_IOWAIT
    + bool "Include iowait time in CPU trigger"
    + depends LEDS_TRIGGER_CPU
    + default n
    + help
    + This option makes iowait CPU time cause the CPU trigger to activate.
    +
    config LEDS_TRIGGER_HEARTBEAT
    tristate "LED Heartbeat Trigger"
    depends LEDS_TRIGGERS
    diff -udrN linux-2.6.17-git25/drivers/leds/ledtrig-cpu.c linux-2.6.17-git25-mine/drivers/leds/ledtrig-cpu.c
    --- linux-2.6.17-git25/drivers/leds/ledtrig-cpu.c 1969-12-31 19:00:00.000000000 -0500
    +++ linux-2.6.17-git25-mine/drivers/leds/ledtrig-cpu.c 2006-07-05 22:42:38.000000000 -0400
    @@ -0,0 +1,87 @@
    +/*
    + * LED CPU Activity Trigger
    + *
    + * Copyright 2006 Thomas Tuttle
    + *
    + * Author: Thomas Tuttle <thinkinginbinary@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/config.h>
    +#include <linux/module.h>
    +#include <linux/kernel.h>
    +#include <linux/init.h>
    +#include <linux/timer.h>
    +#include <linux/leds.h>
    +#include <linux/kernel_stat.h>
    +#include <asm/cputime.h>
    +
    +#define UPDATE_INTERVAL (5) /* delay between updates, in ms */
    +
    +static void ledtrig_cpu_timerfunc(unsigned long data);
    +
    +DEFINE_LED_TRIGGER(ledtrig_cpu);
    +static DEFINE_TIMER(ledtrig_cpu_timer, ledtrig_cpu_timerfunc, 0, 0);
    +
    +static cputime64_t cpu_usage(void)
    +{
    + int i;
    + cputime64_t time = cputime64_zero;
    +
    + for_each_possible_cpu(i) {
    +#ifdef CONFIG_LEDS_TRIGGER_CPU_INCLUDE_USER
    + time = cputime64_add(time, kstat_cpu(i).cpustat.user);
    +#endif
    +#ifdef CONFIG_LEDS_TRIGGER_CPU_INCLUDE_NICE
    + time = cputime64_add(time, kstat_cpu(i).cpustat.nice);
    +#endif
    +#ifdef CONFIG_LEDS_TRIGGER_CPU_INCLUDE_SYSTEM
    + time = cputime64_add(time, kstat_cpu(i).cpustat.system);
    +#endif
    +#ifdef CONFIG_LEDS_TRIGGER_CPU_INCLUDE_IOWAIT
    + time = cputime64_add(time, kstat_cpu(i).cpustat.iowait);
    +#endif
    + }
    +
    + return time;
    +}
    +
    +cputime64_t last_cputime;
    +
    +static void ledtrig_cpu_timerfunc(unsigned long data)
    +{
    + cputime64_t this_cputime = cpu_usage();
    + /* XXX: This assumes that cputime64_t can be subtracted.
    + * Nobody has defined cputime64_sub, so I had to do this instead. */
    + cputime64_t used_cputime = this_cputime - last_cputime;
    + enum led_brightness led_state = (used_cputime > 0) ? LED_FULL : LED_OFF;
    + led_trigger_event(ledtrig_cpu, led_state);
    + last_cputime = cpu_usage();
    +
    + mod_timer(&ledtrig_cpu_timer, jiffies + msecs_to_jiffies(UPDATE_INTERVAL));
    +}
    +
    +static int __init ledtrig_cpu_init(void)
    +{
    + led_trigger_register_simple("cpu", &ledtrig_cpu);
    + last_cputime = cpu_usage();
    + mod_timer(&ledtrig_cpu_timer, jiffies + msecs_to_jiffies(UPDATE_INTERVAL));
    + return 0;
    +}
    +
    +static void __exit ledtrig_cpu_exit(void)
    +{
    + del_timer(&ledtrig_cpu_timer);
    + led_trigger_unregister_simple(ledtrig_cpu);
    +}
    +
    +module_init(ledtrig_cpu_init);
    +module_exit(ledtrig_cpu_exit);
    +
    +MODULE_AUTHOR("Thomas Tuttle <thinkinginbinary@gmail.com>");
    +MODULE_DESCRIPTION("LED CPU Activity Trigger");
    +MODULE_LICENSE("GPL");
    diff -udrN linux-2.6.17-git25/drivers/leds/Makefile linux-2.6.17-git25-mine/drivers/leds/Makefile
    --- linux-2.6.17-git25/drivers/leds/Makefile 2006-07-05 22:11:45.000000000 -0400
    +++ linux-2.6.17-git25-mine/drivers/leds/Makefile 2006-07-05 22:40:52.000000000 -0400
    @@ -16,4 +16,5 @@
    # LED Triggers
    obj-$(CONFIG_LEDS_TRIGGER_TIMER) += ledtrig-timer.o
    obj-$(CONFIG_LEDS_TRIGGER_IDE_DISK) += ledtrig-ide-disk.o
    +obj-$(CONFIG_LEDS_TRIGGER_CPU) += ledtrig-cpu.o
    obj-$(CONFIG_LEDS_TRIGGER_HEARTBEAT) += ledtrig-heartbeat.o
    \
     
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      Last update: 2006-07-06 04:51    [W:0.042 / U:60.956 seconds]
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