linux-kernel - Re: [linux-pm] [PATCH] PM: HIBERNATION: skip the swap size check if the snapshot image size is anticipative

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Message-ID: <CAGsJ_4xU28APFEcALAzuB2jAACa8FbOR6iSvOaEeGZa=JyjNeA@mail.gmail.com>
Date:	Sun, 6 Nov 2011 11:24:15 +0800
From:	Barry Song <21cnbao@...il.com>
To:	Pavel Machek <pavel@....cz>
Cc:	Barry Song <Barry.Song@....com>,
	Xiangzhen Ye <Xiangzhen.Ye@....com>,
	linux-kernel@...r.kernel.org, Barry Song <Baohua.Song@....com>,
	linux-pm@...ts.linux-foundation.org,
	linux-arm-kernel@...ts.infradead.org,
	DL-SHA-WorkGroupLinux <workgroup.linux@....com>
Subject: Re: [linux-pm] [PATCH] PM: HIBERNATION: skip the swap size check if
 the snapshot image size is anticipative

2011/11/6 Pavel Machek <pavel@....cz>:
> Hi!
>
>> From: Barry Song <Baohua.Song@....com>
>>
>> Current swsusp requires swap partitions even larger than real saved pages
>> due to the worst compress ratio:
>> but for an embedded system, which has limited storage space, then it might
>> can't give the big size partition to save snapshot.
>> In the another way, some embedded systems can definitely know the most size
>> needed for snapshot since they run some specific application lists.
>> So this patch provides the possibility for bootloader to tell kernel even
>> the system has a little snapshot partition, but it is still enough.
>> For example, if the system need to save 120MB memory, origin swsusp will require
>> a 130MB partition to save snapshot. but if users know 30MB is enough for them(
>> compressed image will be less than 30MB), they just make a 30MB
>> partition.
>
> Would it be better to have /sys/power/... entry which would allow
> configuring expected compression ratio at runtime?

i think it is better to have a sys node than add another kernel param.
but the point is i only care about the final image size but not
compression ratio. i don't care how well lzo will do for me since i
only have limited disk space and know how many pages want to be saved.
there has been a image_size node, will we have a expected_image_size node?
>                                                                Pavel
>
> --
Thanks
barry
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