Re: Weird wasting of time between ioctl() and ioctl dispatcher

[Andi Kleen]

"Cestonaro, Thilo \(external\)"    <Thilo.Cestonaro.external@xxxxxxxxxxxxxxxxxxx> writes:

> I'm a developer for Fujitsu Siemens Computers, working on a program which has it's own kernel modules and userland components.
> Now cause the program should be released we have done some testing and during this testphase a wierd wasting of time occured
> during the call of the ioctl() in the userland component and the actuall entering of the dispatcher function in the module.
> It takes 3 min. until the call at last enters my dispatcher. 

Something else is holding the big kernel lock for that long. Most likely
it's your own code. Consider using a ->unlocked_ioctl

-Andi
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