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SubjectRe: bzImage ~ 900K with i386 test11-pre2
Peter Samuelson wrote:
> [Robert Lynch] wrote:
> > I've been regularly building kernels in the testXX series, and
> > they have been coming out ~ 600K; test10-final and test11-pre1:
> >
> > -rw-r--r-- 1 root root 610503 Oct 31 18:39 vmlinuz-t10
> > -rw-r--r-- 1 root root 610568 Nov 7 20:26 vmlinuz-t11p01
> >
> > test11-pre2 comes out ~ 900K:
> >
> > -rw-r--r-- 1 root root 926345 Nov 10 10:16 vmlinuz-t11p02
>
> Track it down yourself:
>
> 1) The sizes of your two 'vmlinux' files: do they differ wildly as well?

Wildly; compare test11-pre1 and testll-pre2 sizes:

-rwxr-xr-x 1 root root 1789457 Nov 7 20:26
vmlinux-t11p01
-rwxr-xr-x 1 root root 2625016 Nov 10 10:15
vmlinux-t11p02

> 2a) If no, check the make logs between the vmlinux link line and bzImage
> creation. Compare the two and note any significant differences.
>
> 2b) If yes, write a perl script to compute symbol sizes from each
> System.map file. (Symbol size == address of next symbol minus
> address of this symbol.) Sort numerically, then compare old vs new
> for symbols that have grown a lot, or large new symbols.
>
> Peter

Whence Andi Kleen chipped in:

> No need to write one: ftp.firstfloor.org:/pub/ak/perl/bloat-o-meter
>
> -Andi

Running:

perl bloat-o-meter /boot/vmlinux-t11p01 /boot/vmlinux-t11p02 >
/tmp/bloat.out

looking at the output, the large positive changes seem to be
(doing it by eye, might have skipped and/or missed something):

Symbol Old size New size Delta Change (%)

slabinfo_write_proc 8 340 332 +4150.0
show_buffers 24 368 344 +1433.3
sys_nfsservctl 80 1060 980 +1225.0
dump_extended_fpu 8 84 76 +950.00
get_fpregs 36 372 336 +933.33
schedule_tail 16 144 128 +800.00
set_fpregs 36 272 236 +655.56
tty_release 16 108 92 +575.00
ext2_write_inode 20 108 88 +440.00
...

I have surpressed my momentary urge to post the whole thing, so
as not to arouse the legendary ire of this list. :)

Bob L.

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