linux-kernel - Re: loading firmware while usermodehelper disabled.

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Date:	Tue, 03 Jan 2012 00:44:07 +0000
From:	Jack Stone <jwjstone@...tmail.fm>
To:	Marek Vasut <marek.vasut@...il.com>
CC:	Linus Torvalds <torvalds@...ux-foundation.org>,
	Alan Stern <stern@...land.harvard.edu>,
	Oliver Neukum <oliver@...kum.org>,
	Matthew Garrett <mjg@...hat.com>,
	Dave Jones <davej@...hat.com>,
	Linux Kernel <linux-kernel@...r.kernel.org>,
	Larry Finger <Larry.Finger@...inger.net>,
	Chaoming Li <chaoming_li@...lsil.com.cn>,
	"John W. Linville" <linville@...driver.com>,
	Greg Kroah-Hartman <gregkh@...e.de>,
	USB list <linux-usb@...r.kernel.org>,
	Linux Wireless List <linux-wireless@...r.kernel.org>
Subject: Re: loading firmware while usermodehelper disabled.



Marek Vasut <marek.vasut@...il.com> wrote:

>> On 02/01/12 22:31, Marek Vasut wrote:
>> >> I don't think there is anyway to avoid the memory requirement if
>we want
>> >> to be able to resume transparently to user-space (or even resume
>at all
>> >> in some setups).
>> > 
>> > Well ... injecting firmware into kernel with some userland helper
>just
>> > before suspend is no-go?
>> 
>> Its a perfectly good idea but you still need the full memory
>requirement
>> during the suspend.
>
>Hm ... and we can't have memory type that "can be swapped-out, but must
>be 
>loaded back before suspend" in kernel, right?

Nope. Kernel swapping is a big headache and Linux doesn't do it. The only thing we can do is drop any clean cache pages, but that has performance implications.

Thanks,

Jack

-- 
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