linaro-pm-wg team mailing list archive

[Daniel Lezcano <daniel.lezcano@xxxxxxxxxx>]

On 06/18/2012 10:14 AM, Kejun Zhou wrote:
> On 18 June 2012 16:07, Daniel Lezcano <daniel.lezcano@xxxxxxxxxx> wrote:
> 
>> On 06/18/2012 08:43 AM, Kejun Zhou wrote:
>>> Hi Daniel,
>>>
>>> I saw udevadm is used in pm-qa/cpuhotplug/cpuhotplug_07.sh
>>>
>>>  40
>>>  41     # damn ! udevadm is buffering the output, we have to use a temp
>> file
>>>  42     # to retrieve the output
>>>  43     rm -f $TMPFILE
>>>  44     udevadm monitor --kernel --subsystem-match=cpu > $TMPFILE &
>>>  45     pid=$
>>>
>>> Integrating udevadm to Android system will make util-linux and udev
>>> being involved in Android system.
>>> Is there a substitute of udevadm?
>>
>> I don't think so. You could write a simple C program listening on the
>> udev netlink socket, add it to the testsuite and remove udevadm.
>>
>> There is not udev in Android system. If we use the udev, we need to modify
> a lot of Android system.

What I meant is the kernel should send events through a netlink socket.
Udev use this socket to detect hotplug. I meant you can write a simple
program to read this socket and catch cpu hotplug event.

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>>
> 


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