Re: Boot time: Kernel start parallelization issue?

[Arjan van de Ven <arjan@linux.intel.com>]

On 1/15/2011 12:40 AM, Dirk Behme wrote:
>
> There are some reports [1] [2] looking at the boot time of embedded 
> (ARM?) systems using initcall debug [3]. Both reports seem to show 
> that they have issues with the start up sequence of the kernel being 
> completely single-threaded. In [2] Greg mentions that on a x86 box 
> multi-threads are happening and that there he doesn't see this issue. 
> On the other hand, both reports mention Arjan's async initcall patches 
> [4] to help against the issue. I.e. introducing some parallelization 
> (on ARM) does help, too.
>
> With this, I wonder
>
> - if anybody faces similar issues with single-threaded only kernel 
> start on embedded (ARM?) systems? Or if this is known? Or if there are 
> fixes for this?
>
> - if we somehow should try to 're-activate' Arjan's async initcall 
> patches?

those patches are obsoleted by the merged async_schedule() calls.

what kernel are you seeing issues on?
if it's something ancient, you should update first.