References: <Pine.LNX.4.44L0.1201021041550.10702-100000@netrider.rowland.org> <201201022331.27562.marek.vasut@gmail.com> <4F023D02.1030403@fastmail.fm> <201201030131.15397.marek.vasut@gmail.com>
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Subject: Re: loading firmware while usermodehelper disabled.
From: Jack Stone <jwjstone@fastmail.fm>
Date: Tue, 03 Jan 2012 00:44:07 +0000
To: Marek Vasut <marek.vasut@gmail.com>
CC: Linus Torvalds <torvalds@linux-foundation.org>,
	Alan Stern <stern@rowland.harvard.edu>,
	Oliver Neukum <oliver@neukum.org>,
	Matthew Garrett <mjg@redhat.com>,
	Dave Jones <davej@redhat.com>,
	Linux Kernel <linux-kernel@vger.kernel.org>,
	Larry Finger <Larry.Finger@lwfinger.net>,
	Chaoming Li <chaoming_li@realsil.com.cn>,
	"John W. Linville" <linville@tuxdriver.com>,
	Greg Kroah-Hartman <gregkh@suse.de>,
	USB list <linux-usb@vger.kernel.org>,
	Linux Wireless List <linux-wireless@vger.kernel.org>
Message-ID: <c163595a-163e-4e68-ba0f-de5ca58e8de9@email.android.com> (sfid-20120103_014445_986286_3B0E31EE)
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Marek Vasut <marek.vasut@gmail.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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