lkml.org 
[lkml]   [2007]   [Jul]   [7]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
From
SubjectRe: cpufreq 'choice' Kconfig oddness in 2.6.22-rc6-mm1..
On Sat, Jul 07, 2007 at 12:35:10AM -0400, Valdis.Kletnieks@vt.edu wrote:
> So I was looking at drivers/cpufreq/Kconfig, and wondering...
>
> Is there a specific reason why we have a 'choice' clause that allows selecting
> 'performance' or 'userspace' as the default governor, and no obvious way to
> select powersave, ondemand, or conservative as a default? Or was this an

Yes, ondemand and conservative may refuse to load/work on systems with
a high transition latency and that is sometimes discovered only at
runtime. This makes them not selectable as default governors.

> oversight I should cook up a patch for? Looks like the Kconfig and a bit
> of cut-n-paste in include/linux/cpufreq.h is all that's needed?

No, some more work is needed (e.g.: falling back to a different governor
if the selected fails). Thomas Renninger has posted patches on
cpufreq-devel to accomplish that.

cheers
--
mattia
:wq!
-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@vger.kernel.org
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/

\
 
 \ /
  Last update: 2007-07-07 08:53    [W:0.033 / U:1.752 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site