Fwd: Re: [klibc] klibc and what's the next step?

[Denis Vlasenko]

Just FYI: kernel folks are talking about small userspace
which will start before root fs is mounted, and they are
mentioning busybox:

----------  Forwarded Message  ----------
Subject: Re: [klibc] klibc and what's the next step?
Date: Sunday 02 July 2006 02:50
From: "H. Peter Anvin" <hpa at zytor.com>
To: Theodore Tso <tytso at mit.edu>, "H. Peter Anvin" <hpa at zytor.com>, Linus Torvalds <torvalds at osdl.org>, Jeff Bailey <jbailey at ubuntu.com>, Michael Tokarev <mjt at tls.msk.ru>, Roman Zippel <zippel at linux-m68k.org>, klibc at zytor.com, linux-kernel at vger.kernel.org, Pavel Machek <pavel at ucw.cz>

Theodore Tso wrote:
> 
> Well, I wouldn't be one of those folks.  In fact, how big is dash and
> some select set of shell utilities?  If they aren't that big, it might
> make sense to include them all the time so that a simple command-line
> option on boot is all that's necessary in order to break into a
> pre-kinit interactive shell.  That would make the resulting system
> more debuggable by definition.  Then all we will would have to do is
> make sure the distro's use the kernel-supplied kinit solution, instead
> of rolling their own non-standard version.
> 

Shared binaries, x86-64 (i386 is about 20-25% smaller):

-rwxrwxr-x 1 hpa hpa 58544 Jul  1 11:41 usr/dash/sh.shared*
-rwxrwxr-x 1 hpa hpa  2760 Jul  1 11:41 cat*
-rwxrwxr-x 1 hpa hpa   888 Jul  1 11:41 chroot*
-rwxrwxr-x 1 hpa hpa  4000 Jul  1 11:41 dd*
-rwxrwxr-x 1 hpa hpa   680 Jul  1 11:41 false*
-rwxrwxr-x 3 hpa hpa  1072 Jul  1 11:41 halt*
-rwxrwxr-x 1 hpa hpa  1664 Jul  1 11:41 insmod*
-rwxrwxr-x 1 hpa hpa  1336 Jul  1 11:41 ln*
-rwxrwxr-x 1 hpa hpa  5000 Jul  1 11:41 minips*
-rwxrwxr-x 1 hpa hpa  1984 Jul  1 11:41 mkdir*
-rwxrwxr-x 1 hpa hpa  1704 Jul  1 11:41 mkfifo*
-rwxrwxr-x 1 hpa hpa  1712 Jul  1 11:41 mknod*
-rwxrwxr-x 1 hpa hpa  2184 Jul  1 11:41 mount
-rwxrwxr-x 1 hpa hpa  1320 Jul  1 11:41 nuke*
-rwxrwxr-x 1 hpa hpa   856 Jul  1 11:41 pivot_root*
-rwxrwxr-x 3 hpa hpa  1072 Jul  1 11:41 poweroff*
-rwxrwxr-x 3 hpa hpa  1072 Jul  1 11:41 reboot*
-rwxrwxr-x 1 hpa hpa   864 Jul  1 11:41 sleep*
-rwxrwxr-x 1 hpa hpa   672 Jul  1 11:41 true*
-rwxrwxr-x 1 hpa hpa  1056 Jul  1 11:41 umount*
-rwxrwxr-x 1 hpa hpa  1952 Jul  1 11:41 uname*
-rw-rw-r-- 2 hpa hpa 71016 Jul  1 11:40 
usr/klibc/klibc-Yy9wepARlc-x17pdZDwU1YCOiMQ.so
-rwxrwxr-x 1 hpa hpa 35664 Jul  1 17:48 usr/kinit/kinit.shared*

... totalling about 193K if you include everything.  For comparison, 
static kinit by itself is 67K (which includes ipconfig, nfsroot, etc.) 
For an "include everything" variant, it would probably make more sense 
to port busybox, and/or add more tools as dash builtins.

All of these are uncompressed sizes.

	-hpa
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