libudev and /sys/devices/system/cpu

libudev and /sys/devices/system/cpu

[Martin Grund]

Hi,

I try to access the info stored in /sys/devices/system/cpu to gather information about available CPUs and their architecture ( cache size, levels etc). However, when enumerating over devices and subsystems using  udev_enumerate_scan_devices()  and  udev_enumerate_scan_subsystems() the result list does not contain any entry from /sys/devices/system.

In addition, I tried to get the device using udev_device_new_from_syspath() but this was unsuccessful as well.

What is the best way to read the contents from /sys/devices/system?

Thank you very much in advance,

Martin

Re: libudev and /sys/devices/system/cpu

[Greg KH]

On Thu, Jan 13, 2011 at 08:21:02PM +0100, Martin Grund wrote:
> Hi,
> 
> I try to access the info stored in /sys/devices/system/cpu to gather
> information about available CPUs and their architecture ( cache size,
> levels etc). However, when enumerating over devices and subsystems
> using  udev_enumerate_scan_devices()  and
> udev_enumerate_scan_subsystems() the result list does not contain any
> entry from /sys/devices/system.

That's because the entries there are not "real" devices as far as the
kernel is concerned.

It's a real problem, and Kay has some initial patches floating around
for the kernel to resolve this issue.  I just need to get some spare
time to look them over and get them accepted into the kernel tree.

sorry,

greg k-h