linux-kernel - Re: [PATCH 0/4] support for text-relative kallsyms table

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Date:	Wed, 20 Jan 2016 12:50:52 +0100
From:	Arnd Bergmann <arnd@...db.de>
To:	linuxppc-dev@...ts.ozlabs.org
Cc:	Ingo Molnar <mingo@...nel.org>,
	Ard Biesheuvel <ard.biesheuvel@...aro.org>, mmarek@...e.cz,
	linux-s390@...r.kernel.org, rusty@...tcorp.com.au,
	keescook@...omium.org, x86@...nel.org, heiko.carstens@...ibm.com,
	linux-kernel@...r.kernel.org, hpa@...or.com,
	akpm@...ux-foundation.org
Subject: Re: [PATCH 0/4] support for text-relative kallsyms table

On Wednesday 20 January 2016 11:33:25 Ingo Molnar wrote:
> > The reduction ranges from around 250 KB uncompressed vmlinux size and 10 KB 
> > compressed size (s390) to 3 MB/500 KB for ppc64 (although, in the latter case, 
> > the reduction in uncompressed size is primarily __init data)
> 
> So since kallsyms is in unswappable kernel RAM, the uncompressed size reduction is 
> what we care about mostly. How much bootloader load times are impacted is a third 
> order concern.
> 
> IOW a nice change!

I think some people care a lot about the compressed size as well:

http://git.openwrt.org/?p=openwrt.git;a=blob;f=target/linux/generic/patches-4.4/203-kallsyms_uncompressed.patch;h=cf8a447bbcd5b1621d4edc36a69fe0ad384fe53f;hb=HEAD

This has been in openwrt.git for ages, because a lot of the target devices
are much more limited on flash memory size (4MB typically) than they are
on RAM size (at least 32MB).

	Arnd