linux-kernel - Re: [PATCH] Add the LED burst trigger

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Message-ID: <1388184301.11527.29.camel@ted>
Date:	Fri, 27 Dec 2013 22:45:01 +0000
From:	Richard Purdie <richard.purdie@...uxfoundation.org>
To:	One Thousand Gnomes <gnomes@...rguk.ukuu.org.uk>
Cc:	Pavel Machek <pavel@....cz>, Joe Xue <lgxue@...mail.com>,
	"cooloney@...il.com" <cooloney@...il.com>,
	"rob@...dley.net" <rob@...dley.net>,
	"milo.kim@...com" <milo.kim@...com>,
	"linux-leds@...r.kernel.org" <linux-leds@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-doc@...r.kernel.org" <linux-doc@...r.kernel.org>
Subject: Re: [PATCH] Add the LED burst trigger

On Fri, 2013-12-27 at 18:13 +0000, One Thousand Gnomes wrote:
> > Well, this one will be really smaller. And yes, it will make some
> > memory non-swappable, but I believe with triggers and infrastructure
> > for N900 (and similar) it will be worth it.
> 
> Ah yes thats such a major proportion of platforms
> 
> > Plus, it will actually save CPU cycles, and thus significant power.
> 
> All of which will be totally wiped out if you bump all the millions of
> x86 server boxes in the world up by one page of kernel space and cause a
> few disk I/Os

FWIW the LED subsystem was designed to take advantage of kernel modules.
If you don't use a given trigger, it needn't be in memory, loaded or
even built at all. If something changed there which made that not
possible, that would be rather sad.

I agree with you that we shouldn't bump the kernel size unnecessarily
but I don't think triggers should do so. I actually think the kernel
could do with going on a diet and at least made so you can untangle more
of the pieces you don't want/need.

Cheers,

Richard

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