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https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
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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>
60 lines
1.6 KiB
Bash
Executable file
60 lines
1.6 KiB
Bash
Executable file
#!/bin/sh -x
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# Based on the vmlinux file create the System.map file
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# System.map is used by module-init tools and some debugging
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# tools to retrieve the actual addresses of symbols in the kernel.
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#
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# Usage
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# mksysmap vmlinux System.map
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#####
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# Generate System.map (actual filename passed as second argument)
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# $NM produces the following output:
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# f0081e80 T alloc_vfsmnt
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# The second row specify the type of the symbol:
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# A = Absolute
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# B = Uninitialised data (.bss)
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# C = Common symbol
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# D = Initialised data
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# G = Initialised data for small objects
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# I = Indirect reference to another symbol
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# N = Debugging symbol
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# R = Read only
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# S = Uninitialised data for small objects
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# T = Text code symbol
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# U = Undefined symbol
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# V = Weak symbol
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# W = Weak symbol
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# Corresponding small letters are local symbols
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# For System.map filter away:
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# a - local absolute symbols
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# U - undefined global symbols
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# N - debugging symbols
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# w - local weak symbols
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# readprofile starts reading symbols when _stext is found, and
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# continue until it finds a symbol which is not either of 'T', 't',
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# 'W' or 'w'.
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#
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# Ignored prefixes:
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# $ - local symbols for ARM, MIPS, etc.
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# .L - local labels, .LBB,.Ltmpxxx,.L__unnamed_xx,.LASANPC, etc.
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# __crc_ - modversions
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# __kstrtab_ - EXPORT_SYMBOL (symbol name)
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# __kstrtabns_ - EXPORT_SYMBOL (namespace)
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#
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# Ignored symbols:
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# L0 - for LoongArch?
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$NM -n $1 | grep -v \
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-e ' [aNUw] ' \
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-e ' \$' \
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-e ' \.L' \
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-e ' __crc_' \
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-e ' __kstrtab_' \
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-e ' __kstrtabns_' \
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-e ' L0$' \
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> $2
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