linux-kernel - Re: [RFC v1 0/3] driver-core: add asynch module loading support

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Message-ID: <e781dc3b-5829-4bce-8a34-7ed708309f3b@email.android.com>
Date:	Sun, 31 Aug 2014 15:45:11 -0700
From:	Dmitry Torokhov <dmitry.torokhov@...il.com>
To:	Arjan van de Ven <arjan@...ux.intel.com>,
	吴章金 <falcon@...zu.com>,
	Greg KH <gregkh@...uxfoundation.org>
CC:	"Luis R. Rodriguez" <mcgrof@...not-panic.com>,
	"tiwai@...e.de" <tiwai@...e.de>, "tj@...nel.org" <tj@...nel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"oleg@...hat.com" <oleg@...hat.com>,
	"akpm@...ux-foundation.org" <akpm@...ux-foundation.org>,
	"penguin-kernel@...ove.sakura.ne.jp" 
	<penguin-kernel@...ove.sakura.ne.jp>,
	"joseph.salisbury@...onical.com" <joseph.salisbury@...onical.com>,
	"bpoirier@...e.de" <bpoirier@...e.de>,
	"Luis R. Rodriguez" <mcgrof@...e.com>
Subject: Re: [RFC v1 0/3] driver-core: add asynch module loading support

On August 31, 2014 3:32:19 PM PDT, Arjan van de Ven <arjan@...ux.intel.com> wrote:
>On 8/31/2014 1:06 PM, 吴章金 wrote:
>> Hi, folks
>>
>> I'm back to this discussion,
>>
>> The original requirement of my first RFC patchset is mainly for
>Android Smartphone use case:
>>
>> 1. We want light on LCD and draw a logo immediately after power key
>press(don't consider uboot or lk biotloader here).
>> 2. We want the whole kernel boot fast to give user the Android Launch
>deaktop
>> 3. The modem initialization/reset is slow
>> 4. The Touchpad firmware upgrade is slow
>> 5. We have many cpu cores(up to 8 in latest exynos 5430 and
>MT6595...)
>> 6. We have few schedulable/parallellizable threads
>> 7. We compiled all of the modules in the kernel(stupid? avoid
>modprobe...but lose parallelization in userspace)
>>
>> So, I think about is that possible to async most of the probes, but
>still reserve the requred dependencies to let them still work as
>expected.
>
>you can boot a whole kernel including all graphics in less than 0.5
>seconds, even without this patchset.


You forgot to add "on certain subset of hardware and configuration".

Thanks.

-- 
Dmitry
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