Commit d32b55f4 authored by Masahiro Yamada's avatar Masahiro Yamada
Browse files

kallsyms: ignore __kstrtab_* and __kstrtabns_* symbols 



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: default avatarMasahiro Yamada <masahiroy@kernel.org>
parent aa221f2e

scripts/mksysmap

+4 −0
Original line number Diff line number Diff line
@@ -43,6 +43,8 @@ 
#  $                    - 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?
@@ -52,5 +54,7 @@ $NM -n $1 | grep -v \ 
	-e ' \$'		\

	-e ' \.L'		\

	-e ' __crc_'		\

	-e ' __kstrtab_'	\

	-e ' __kstrtabns_'	\

	-e ' L0$'		\

> $2