[systemd-devel] Improving module loading

[Umut Tezduyar Lindskog]

On Sat, Dec 20, 2014 at 6:10 PM, Greg KH <gregkh at linuxfoundation.org> wrote:
> On Sat, Dec 20, 2014 at 10:45:34AM +0000, Hoyer, Marko (ADITG/SW2) wrote:
>> Hi,
>>
>> > -----Original Message-----
>> > From: systemd-devel [mailto:systemd-devel-
>> > bounces at lists.freedesktop.org] On Behalf Of Umut Tezduyar Lindskog
>> > Sent: Tuesday, December 16, 2014 4:55 PM
>> > To: systemd-devel at lists.freedesktop.org
>> > Subject: [systemd-devel] Improving module loading
>> >
>> > Hi,
>> >
>> > Is there a reason why systemd-modules-load is loading modules
>> > sequentially? Few things can happen simultaneously like resolving the
>> > symbols etc. Seems like modules_mutex is common on module loads which
>> > gets locked up on few occasions throughout the execution of
>> > sys_init_module.
>>
>> We are actually doing this (in embedded systems which need to be up
>> very fast with limited resources) and gained a lot. Mainly, IO and CPU
>> can be better utilized by loading modules in parallel (one module is
>> loaded while another one probes for hardware or is doing memory
>> initialization).
>
> If you have control over your kernel, why not just build the modules
> into the kernel, then all of this isn't an issue at all and there is no
> overhead of module loading?

For us, licenses are the problem.
Umut

>
> greg k-h