mirror of
https://mirrors.bfsu.edu.cn/git/linux.git
synced 2024-12-11 13:04:03 +08:00
d32b55f4bb
Every EXPORT_SYMBOL creates __kstrtab_* and __kstrtabns_*, which
consumes 15-20% of the kallsyms entries.
For example, on the system built from the x86_64 defconfig,
$ cat /proc/kallsyms | wc
129527 388581 5685465
$ cat /proc/kallsyms | grep __kstrtab | wc
23489 70467 1187932
We already ignore __crc_* symbols populated by EXPORT_SYMBOL, so it
should be fine to ignore __kstrtab_* and __kstrtabns_* as well.
This makes vmlinux a bit smaller.
$ size vmlinux.before vmlinux.after
text data bss dec hex filename
22785374 8559694 1413328 32758396 1f3da7c vmlinux.before
22785374 8137806 1413328 32336508 1ed6a7c vmlinux.after
Signed-off-by: Masahiro Yamada <masahiroy@kernel.org>
61 lines
1.6 KiB
Bash
Executable File
61 lines
1.6 KiB
Bash
Executable File
#!/bin/sh -x
|
|
# Based on the vmlinux file create the System.map file
|
|
# System.map is used by module-init tools and some debugging
|
|
# tools to retrieve the actual addresses of symbols in the kernel.
|
|
#
|
|
# Usage
|
|
# mksysmap vmlinux System.map
|
|
|
|
|
|
#####
|
|
# Generate System.map (actual filename passed as second argument)
|
|
|
|
# $NM produces the following output:
|
|
# f0081e80 T alloc_vfsmnt
|
|
|
|
# The second row specify the type of the symbol:
|
|
# A = Absolute
|
|
# B = Uninitialised data (.bss)
|
|
# C = Common symbol
|
|
# D = Initialised data
|
|
# G = Initialised data for small objects
|
|
# I = Indirect reference to another symbol
|
|
# N = Debugging symbol
|
|
# R = Read only
|
|
# S = Uninitialised data for small objects
|
|
# T = Text code symbol
|
|
# U = Undefined symbol
|
|
# V = Weak symbol
|
|
# W = Weak symbol
|
|
# Corresponding small letters are local symbols
|
|
|
|
# For System.map filter away:
|
|
# a - local absolute symbols
|
|
# U - undefined global symbols
|
|
# N - debugging symbols
|
|
# w - local weak symbols
|
|
|
|
# readprofile starts reading symbols when _stext is found, and
|
|
# continue until it finds a symbol which is not either of 'T', 't',
|
|
# 'W' or 'w'.
|
|
#
|
|
# Ignored prefixes:
|
|
# $ - local symbols for ARM, MIPS, etc.
|
|
# .L - local labels, .LBB,.Ltmpxxx,.L__unnamed_xx,.LASANPC, etc.
|
|
# __crc_ - modversions
|
|
# __kstrtab_ - EXPORT_SYMBOL (symbol name)
|
|
# __kstrtabns_ - EXPORT_SYMBOL (namespace)
|
|
#
|
|
# Ignored symbols:
|
|
# L0 - for LoongArch?
|
|
|
|
$NM -n $1 | grep -v \
|
|
-e ' [aNUw] ' \
|
|
-e ' \$' \
|
|
-e ' \.L' \
|
|
-e ' __crc_' \
|
|
-e ' __kstrtab_' \
|
|
-e ' __kstrtabns_' \
|
|
-e ' L0$' \
|
|
> $2
|