linux-kernel - Re: 2.6.24-rc5-git7: Reported regressions from 2.6.23

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Message-ID: <878x3o5c5h.fsf@saeurebad.de>
Date:	Fri, 21 Dec 2007 15:56:58 +0100
From:	Johannes Weiner <hannes@...urebad.de>
To:	Michael Tokarev <mjt@....msk.ru>
Cc:	"Rafael J. Wysocki" <rjw@...k.pl>,
	LKML <linux-kernel@...r.kernel.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Ingo Molnar <mingo@...e.hu>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Dave Jones <davej@...emonkey.org.uk>
Subject: Re: 2.6.24-rc5-git7: Reported regressions from 2.6.23

Hi,

Michael Tokarev <mjt@....msk.ru> writes:

> By the way, is there any real need to specify default governor at
> a compile time in the first place?  Performance governor (which was
> the only default so far) is a very simple one (not large to consider
> its size effects for embedded systems for example), and switching
> governors at run time is trivial as well.  What's the motivation
> behind this new config option?

I think it is just convenient.  If you never use the performance
governor, there is no need to compile it.  I have no need for an init
script that changes the governor on runtime, too.  I just say, use this
and nothing else, ever.  Don't know if this convenience is worth the
trouble, though ;)

>> This migrates all governors from module_init() to fs_initcall() when
>> being the default, as was already done in cpufreq_performance when it
>> was the only possible choice.
>
> Oh well.  Which leads to more surprises in the future, I think...

It appears a bit hackish.  I would be interested in a cleaner way to
force an earlier call to a module's init function.

	Hannes
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