2006-02-11 21:18:39

by Nico Golde

[permalink] [raw]
Subject: Getting cpu frequency

Hi,
at the moment I try to get the current cpu frequency via
using the cpufreq_get() function defined in linux/cpufreq.h.
Can someone point me to the headers I have to include to let
this work because just doing #include <linux/cpufreq.h>
results in a bunch of errors:
[...]
In file included from /usr/include/linux/cpu.h:22,
from cpu.c:2:
/usr/include/linux/sysdev.h:31: error: field 'drivers' has incomplete type
/usr/include/linux/sysdev.h:35: error: syntax error before 'pm_message_t'
/usr/include/linux/sysdev.h:37: error: field 'kset' has incomplete type
/usr/include/linux/sysdev.h:50: error: field 'entry' has incomplete type
/usr/include/linux/sysdev.h:54: error: syntax error before 'pm_message_t'
/usr/include/linux/sysdev.h:69: error: syntax error before 'u32'
/usr/include/linux/sysdev.h:72: error: syntax error before '}' token
/usr/include/linux/sysdev.h:79: error: field 'attr' has incomplete type
/usr/include/linux/sysdev.h:80: error: syntax error before 'ssize_
[...]
Using 2.6.14.
Regards Nico
P.S. Please CC me, I am not subsribed, thanks

--
Nico Golde - JAB: [email protected] | GPG: 0x73647CFF
http://www.ngolde.de | http://www.muttng.org | http://grml.org
Forget about that mouse with 3/4/5 buttons -
gimme a keyboard with 103/104/105 keys!


Attachments:
(No filename) (1.26 kB)
(No filename) (189.00 B)
Download all attachments

2006-02-11 21:38:03

by Dave Jones

[permalink] [raw]
Subject: Re: Getting cpu frequency

On Sat, Feb 11, 2006 at 09:47:34PM +0100, Nico Golde wrote:
> Hi,
> at the moment I try to get the current cpu frequency via
> using the cpufreq_get() function defined in linux/cpufreq.h.
> Can someone point me to the headers I have to include to let
> this work because just doing #include <linux/cpufreq.h>
> results in a bunch of errors:
> [...]
> In file included from /usr/include/linux/cpu.h:22,
> from cpu.c:2:
> /usr/include/linux/sysdev.h:31: error: field 'drivers' has incomplete type
> /usr/include/linux/sysdev.h:35: error: syntax error before 'pm_message_t'
> /usr/include/linux/sysdev.h:37: error: field 'kset' has incomplete type
> /usr/include/linux/sysdev.h:50: error: field 'entry' has incomplete type
> /usr/include/linux/sysdev.h:54: error: syntax error before 'pm_message_t'
> /usr/include/linux/sysdev.h:69: error: syntax error before 'u32'
> /usr/include/linux/sysdev.h:72: error: syntax error before '}' token
> /usr/include/linux/sysdev.h:79: error: field 'attr' has incomplete type
> /usr/include/linux/sysdev.h:80: error: syntax error before 'ssize_
> [...]
> Using 2.6.14.
> Regards Nico
> P.S. Please CC me, I am not subsribed, thanks

Are you trying to do this from a userspace program ?
If so, this isn't going to work.

Dave


2006-02-11 21:42:19

by Nico Golde

[permalink] [raw]
Subject: Re: Getting cpu frequency

Hallo Dave,

* Dave Jones <[email protected]> [2006-02-11 22:38]:
> On Sat, Feb 11, 2006 at 09:47:34PM +0100, Nico Golde wrote:
> > Hi,
> > at the moment I try to get the current cpu frequency via
> > using the cpufreq_get() function defined in linux/cpufreq.h.
> > Can someone point me to the headers I have to include to let
> > this work because just doing #include <linux/cpufreq.h>
> > results in a bunch of errors:
> > [...]
> > In file included from /usr/include/linux/cpu.h:22,
> > from cpu.c:2:
> > /usr/include/linux/sysdev.h:31: error: field 'drivers' has incomplete type
> > /usr/include/linux/sysdev.h:35: error: syntax error before 'pm_message_t'
> > /usr/include/linux/sysdev.h:37: error: field 'kset' has incomplete type
> > /usr/include/linux/sysdev.h:50: error: field 'entry' has incomplete type
> > /usr/include/linux/sysdev.h:54: error: syntax error before 'pm_message_t'
> > /usr/include/linux/sysdev.h:69: error: syntax error before 'u32'
> > /usr/include/linux/sysdev.h:72: error: syntax error before '}' token
> > /usr/include/linux/sysdev.h:79: error: field 'attr' has incomplete type
> > /usr/include/linux/sysdev.h:80: error: syntax error before 'ssize_
> > [...]
> > Using 2.6.14.
> > Regards Nico
> > P.S. Please CC me, I am not subsribed, thanks
>
> Are you trying to do this from a userspace program ?
> If so, this isn't going to work.

Yes I am.
Regards Nico
--
Nico Golde - JAB: [email protected] | GPG: 0x73647CFF
http://www.ngolde.de | http://www.muttng.org | http://grml.org
Forget about that mouse with 3/4/5 buttons -
gimme a keyboard with 103/104/105 keys!


Attachments:
(No filename) (1.60 kB)
(No filename) (189.00 B)
Download all attachments

2006-02-11 22:13:13

by Dave Jones

[permalink] [raw]
Subject: Re: Getting cpu frequency

On Sat, Feb 11, 2006 at 10:42:07PM +0100, Nico Golde wrote:
> Hallo Dave,
>
> * Dave Jones <[email protected]> [2006-02-11 22:38]:
> > On Sat, Feb 11, 2006 at 09:47:34PM +0100, Nico Golde wrote:
> > > Hi,
> > > at the moment I try to get the current cpu frequency
> > > P.S. Please CC me, I am not subsribed, thanks
> >
> > Are you trying to do this from a userspace program ?
> > If so, this isn't going to work.
>
> Yes I am.

Read it from sysfs or /proc/cpuinfo.
But, why does your app care ?
If it's to set up some sort of timing loop, it's going to
fail miserably.

Dave

2006-02-11 22:17:00

by Nico Golde

[permalink] [raw]
Subject: Re: Getting cpu frequency

* Dave Jones <[email protected]> [2006-02-11 23:15]:
> On Sat, Feb 11, 2006 at 10:42:07PM +0100, Nico Golde wrote:
> > Hallo Dave,
> >
> > * Dave Jones <[email protected]> [2006-02-11 22:38]:
> > > On Sat, Feb 11, 2006 at 09:47:34PM +0100, Nico Golde wrote:
> > > > Hi,
> > > > at the moment I try to get the current cpu frequency
> > > > P.S. Please CC me, I am not subsribed, thanks
> > >
> > > Are you trying to do this from a userspace program ?
> > > If so, this isn't going to work.
> >
> > Yes I am.
>
> Read it from sysfs or /proc/cpuinfo.

Thats exactly what I dont wanted to do and thought its
possible without reading a file. So it seems to be not,
thank you will use sysfs to get the information.
Regards Nico

--
Nico Golde - JAB: [email protected] | GPG: 0x73647CFF
http://www.ngolde.de | http://www.muttng.org | http://grml.org
Forget about that mouse with 3/4/5 buttons -
gimme a keyboard with 103/104/105 keys!


Attachments:
(No filename) (949.00 B)
(No filename) (189.00 B)
Download all attachments

2006-02-12 08:45:25

by Mattia Dongili

[permalink] [raw]
Subject: Re: Getting cpu frequency

On Sat, Feb 11, 2006 at 11:16:48PM +0100, Nico Golde wrote:
> * Dave Jones <[email protected]> [2006-02-11 23:15]:
> > On Sat, Feb 11, 2006 at 10:42:07PM +0100, Nico Golde wrote:
> > > Hallo Dave,
> > >
> > > * Dave Jones <[email protected]> [2006-02-11 22:38]:
> > > > On Sat, Feb 11, 2006 at 09:47:34PM +0100, Nico Golde wrote:
> > > > > Hi,
> > > > > at the moment I try to get the current cpu frequency
> > > > > P.S. Please CC me, I am not subsribed, thanks
> > > >
> > > > Are you trying to do this from a userspace program ?
> > > > If so, this isn't going to work.
> > >
> > > Yes I am.
> >
> > Read it from sysfs or /proc/cpuinfo.
>
> Thats exactly what I dont wanted to do and thought its
> possible without reading a file. So it seems to be not,
> thank you will use sysfs to get the information.
> Regards Nico

there's still libcpufreq from cpufrequtils if you wish some kind of
abstraction over reading a file.

--
mattia
:wq!