On Thu, 7 Feb 2008, Arnaldo Carvalho de Melo wrote:
> Hi Ingo,
>
> I'm starting with you because the first file I used to
> experiment with this idea was arch/x86/ia32/sys_ia32.c.
>
> I found it strange that the struct sk_buff definition was found
> inside the DWARF debugging sections in the generated object, so I verified
> and found that there is no need for the files that bring struct sk_buff
> definition into this file and verified also that sk_buff is not brought
> in indirectly too, thru other headers.
>
> I went on and removed many other unneeded includes and the end
> result is:
>
> [EMAIL PROTECTED] net-2.6]$ l /tmp/sys_ia32.o.before /tmp/sys_ia32.o.after
> -rw-rw-r-- 1 acme acme 185240 2008-02-06 19:19 /tmp/sys_ia32.o.after
> -rw-rw-r-- 1 acme acme 248328 2008-02-06 19:00 /tmp/sys_ia32.o.before
>
> Almost 64KB only on this object file!
>
> There were no other side effects from this change:
>
> [EMAIL PROTECTED] net-2.6]$ objcopy -j "text" /tmp/sys_ia32.o.before
> /tmp/text.before
> [EMAIL PROTECTED] net-2.6]$ objcopy -j "text" /tmp/sys_ia32.o.after
> /tmp/text.after
> [EMAIL PROTECTED] net-2.6]$ md5sum /tmp/text.before /tmp/text.after
> b7ac9b17942add68494e698e4f965d36 /tmp/text.before
> b7ac9b17942add68494e698e4f965d36 /tmp/text.after
>
> One of the complaints about using tools such as systemtap is
> that one has to install the huge kernel-debuginfo package:
>
> [EMAIL PROTECTED] net-2.6]$ rpm -q --qf "%{size}\n" kernel-rt-debuginfo
> 471737710
> 543867594
> [EMAIL PROTECTED] net-2.6]$
>
> So I'll try to improve automation to find more of these cases.
That'd be grat.
> Here goes the first patch, regards.
Applied. Thanks,
tglx
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