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

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Message-ID: <20111105182244.GB6772@elf.ucw.cz>
Date:	Sat, 5 Nov 2011 19:22:44 +0100
From:	Pavel Machek <pavel@....cz>
To:	Barry Song <Barry.Song@....com>
Cc:	linux-pm@...ts.linux-foundation.org, rjw@...k.pl,
	linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
	Barry Song <Baohua.Song@....com>,
	Xiangzhen Ye <Xiangzhen.Ye@....com>
Subject: Re: [PATCH] PM: HIBERNATION: skip the swap size check if the
 snapshot image size is anticipative

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?
								Pavel

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