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SubjectRe: a.out binaries that are 66% faster than ELF, problem found?

On Thu, 27 Feb 1997, Bernd Schmidt wrote:

> > for example, aic7xxx_isr() has a real stack usage of 53 bytes,
>
> There aren't only the variables at the start of the function. Look a bit
> further down, somewhere in a local block they allocate a huge array. [...]

ok, to avoid such problems in the future, here is a one-liner shell-script
that lists the largest stacks in the system (x86). (also a good candidate
for the ugliest shellscript ever):

--------------------------------------------------------------------->
objdump --disassemble vmlinux | grep esp | grep subl | grep -v '+' |
awk '{print $4","$2}' | cut -c4- | awk -F , '{print " "$1" "$3}' |
grep -E '^ ... <' | sort -r | tee ueberstacks.txt
<--------------------------------------------------------------------

In my setup this gives the following ueberstacks.txt:

49c <aic7xxx_isr>
448 <smb_proc_readdir_long>
440 <smb_proc_setattr_trans2>
424 <smb_proc_getattr_trans2>
424 <aic7xxx_reset_device>
294 <elf_core_dump>
240 <block_write>
240 <block_read>
218 <cdrom_read_intr>
200 <scsi_make_blocked_list>
200 <cdrom_buffer_sectors>
18c <smb_read_super>
18c <fat_readdirx>
17c <aout_core_dump>
144 <nfsiod>
140 <smb_lookup>
13c <smb_notify_change>
13c <smb_create>
138 <read_core>
138 <do_mount_root>
130 <do_execve>
12c <scan_scsis>
128 <SHATransform>
124 <vc_resize>
118 <aic7xxx_detect>
10c <smb_proc_reconnect>
10c <load_elf_binary>
108 <sys_sendmsg>
100 <sys_semop>
100 <isofs_get_last_session>

Brave souls might want to enable all config options and see what happens?

-- mingo


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