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

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Message-ID: <5403A273.4070504@linux.intel.com>
Date:	Sun, 31 Aug 2014 15:32:19 -0700
From:	Arjan van de Ven <arjan@...ux.intel.com>
To:	吴章金 <falcon@...zu.com>,
	Greg KH <gregkh@...uxfoundation.org>
CC:	Dmitry Torokhov <dmitry.torokhov@...il.com>,
	"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 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.


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