Re: [RFC PATCH 0/6] module, kbuild: Faster boot with custom kernel.
From: Kay Sievers
Date: Wed Feb 25 2009 - 13:13:09 EST
On Wed, Feb 25, 2009 at 08:03, Rusty Russell <rusty@xxxxxxxxxxxxxxx> wrote:
> On Tuesday 24 February 2009 03:12:28 Kay Sievers wrote:
>> are you taking care, that this patch gets merged somewhere, and shows
>> up in -next?
> Yep, already done.
>> I still get a ~10% improvement without the mutex, and traces show some
>> parallelism from different modprobe processes. Any idea how to safely
>> minimize the time we need to hold it?
> OK, let's do that then.
> <hack hack>
> Here's a backported version which you should be able to simply apply; it'll
> be good to check that we still win...
It's a little bit faster, and the traces show a bit less serialization
and more overlapping code execution.
The difference is very small though, and hard to notice -- loading of
all the 39 modules triggered by a udev coldplug run finishes after
0.23 seconds. After calling init, the last of these modules goes
"live" after 0.26 seconds. Most of the time the modules need is spent
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