linux-kernel - Re: [PATCH 2/6] x86_64 UV: Use LED to indicate CPU is active

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Date:	Mon, 25 Aug 2008 10:53:04 -0700
From:	Mike Travis <travis@....com>
To:	Pavel Machek <pavel@...e.cz>
CC:	Ingo Molnar <mingo@...e.hu>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Jack Steiner <steiner@....com>, linux-kernel@...r.kernel.org,
	"H. Peter Anvin" <hpa@...or.com>,
	Thomas Gleixner <tglx@...utronix.de>
Subject: Re: [PATCH 2/6] x86_64 UV: Use LED to indicate CPU is active

Pavel Machek wrote:
> Hi!
> 
>>> +/*
>>> + * Illuminate "activity" LED when CPU is going "active",
>>> + * extinguish when going "idle".
>>> + */
>>> +static int uv_idle(struct notifier_block *nfb, unsigned long action, void *junk)
>>> +{
>>> +	if (action == IDLE_START)
>>> +		uv_set_led_bits(0, LED_CPU_ACTIVITY);
>>> +
>>> +	else if (action == IDLE_END)
>>> +		uv_set_led_bits(LED_CPU_ACTIVITY, LED_CPU_ACTIVITY);
>>> +
>>> +	return NOTIFY_OK;
>>> +}
>>> +
>>> +static struct notifier_block uv_idle_notifier = {
>>> +	.notifier_call = uv_idle,
>>> +};
>>>  
>>> +/*
>>> + * Initialize idle led callback function
>>> + */
>>> +static __init void uv_init_led_idle_display(void)
>>> +{
>>> +	/* initialize timer for activity monitor */
>>> +	idle_notifier_register(&uv_idle_notifier);
>>> +}
>> hm, i think this is a bad idea. While putting it into the go-to-idle 
> 
> Plus this really should not be uv-specific. We already have generic
> triggers.
> 
> And you should really CC led maintainers!
> 									Pavel

Thanks for the pointers, I will definitely look into this.

(And sorry for not discovering the LED docs and maintainers earlier.)

Mike
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