[systemd-devel] Improving module loading

[Greg KH]

On Sat, Dec 20, 2014 at 06:40:49PM +0100, Umut Tezduyar Lindskog wrote:
> 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.

Then you are on your own, and be prepared to deal with the legal issues
involved.

No sympathy here.

greg k-h