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From: Koen Kooi <k.kooi@student.utwente.nl>
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Subject: Re: invalidating udev cache, how?
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On 03-03-09 06:11, Denys Dmytriyenko wrote:
> On Thu, Dec 04, 2008 at 06:41:50PM +0100, Koen Kooi wrote:
>> On 04-12-08 18:09, Mike (mwester) wrote:
>>> Mike (mwester) wrote:
>>>
>>>> A slight improvement would be to make the dev.tar file dependent upon
>>>> the bootargs; i.e. invalidate /etc/dev.tar file if the boot command line
>>>> doesn't match the current command line.  This could be a very fast
>>>> operation, just "cmp /proc/cmdline /etc/dev_cmdline" or similar.
>>> As I consider this further, we could actually just save and compare
>>> /proc/atags if that's present on the device in question (falling back to
>>> /proc/cmdline if not present).  That would catch *any* changes passed in
>>> to the kernel via the bootloader.
>>>
>>> Flashing a new kernel would seem to be another logical place to
>>> invalidate the cache, so adding a comparison of "uname -rv" would be a
>>> reasonable way to catch that.
>> That should indeed take care of bootargs and kernel version changes. I'm
>> still tempted to add option 2) to all that :)
>
> Sorry for bringing up this old discussion. Are there any plans to implement
> the above checks in udev?

Plans yes, time no :(

regards,

Koen