linux-kernel - Re: [PATCH 0/2] Kexec jump: The first step to kexec base hibernation

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Message-Id: <200707141124.57935.rjw@sisk.pl>
Date:	Sat, 14 Jul 2007 11:24:56 +0200
From:	"Rafael J. Wysocki" <rjw@...k.pl>
To:	david@...g.hm
Cc:	Jeremy Maitin-Shepard <jbms@....edu>,
	"Huang, Ying" <ying.huang@...el.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Pavel Machek <pavel@....cz>, nigel@...el.suspend2.net,
	linux-kernel@...r.kernel.org, linux-pm@...ts.linux-foundation.org
Subject: Re: [PATCH 0/2] Kexec jump: The first step to kexec base hibernation

On Saturday, 14 July 2007 10:33, david@...g.hm wrote:
> by the way, a data point on kernel sizes
> 
> -rw-r--r-- 1 root root  864648 Jul 14 00:53 vmlinuz.2.6.22.1.hibernate
> -rw-r--r-- 1 root root  659496 Jul 14 01:17 vmlinuz.2.6.22.1.hibernate.stripped
> -rw-r--r-- 1 root root 3948168 Jul 14 01:10 vmlinuz.2.6.22.1.running
> 
> the running one matches the config I'm running on my home server, the 
> hibernate is a pretty stripped down version, and the stripped is close to 
> a minimum (including turning off printk and BUG()). All three are with all 
> drivers built-in, no module support.
> 
> this is on a amd64 64 bit system
> 
> configs are available if anyone cares, the point is how much smaller a 
> kernel could be if it doesn't need all the stuff that you put in your main 
> kernel. In my case this includes not enabling the 3-ware card that holds 
> my 12-disk raid array, instead the hibernate image would be stored on one 
> of the scsi drives attached to the adaptec 78xx card.
> 
> I expect that on a normal desktop/laptop with more features (like sound) 
> the savings could be even more significant

But the kernel needs some data to work too (a 'struct page' for each memory
page etc.).

Greetings,
Rafael


-- 
"Premature optimization is the root of all evil." - Donald Knuth
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