Sample of my kernel's mostly useless symbols
(starting_with:# of symbols):
__func__: 624
__vendorstr_: 1760
__pci_fixup_PCI_: 116
__ksymtab_: 2597
__kstrtab_: 2597
__kcrctab_: 2597
__initcall_: 236
__devicestr_: 4686
__devices_: 1760
Total: 16973
Lines in System.map: 39735
Excluding them from in-kernel symbol table saves ~300kb:
text data bss dec hex filename
4337710 1054414 259296 5651420 563bdc vmlinux.carrier1 - w/o KALLSYMS
4342068 1296046 259296 5897410 59fcc2 vmlinux - with KALLSYMS+patch
4341948 1607634 259296 6208878 5ebd6e vmlinux.carrier - with KALLSYMS
^^^^^^^
--
vda
--- linux-2.6.12.org/scripts/kallsyms.c.org Sun Jun 19 16:11:06 2005
+++ linux-2.6.12.org/scripts/kallsyms.c Wed Aug 10 23:52:06 2005
@@ -36,7 +36,7 @@
/* we use only a subset of the complete symbol table to gather the token count,
* to speed up compression, at the expense of a little compression ratio */
-#define WORKING_SET 1024
+#define WORKING_SET (1024*4)
/* first find the best token only on the list of tokens that would profit more
* than GOOD_BAD_THRESHOLD. Only if this list is empty go to the "bad" list.
@@ -102,11 +102,34 @@ usage(void)
* This ignores the intensely annoying "mapping symbols" found
* in ARM ELF files: $a, $t and $d.
*/
+/*
+__func__: 624
+__vendorstr_: 1760
+__pci_fixup_PCI_: 116
+__ksymtab_: 2597
+__kstrtab_: 2597
+__kcrctab_: 2597
+__initcall_: 236
+__devicestr_: 4686
+__devices_: 1760
+Total: 16973
+Lines in System.map: 39735
+*/
static inline int
is_arm_mapping_symbol(const char *str)
{
- return str[0] == '$' && strchr("atd", str[1])
- && (str[2] == '\0' || str[2] == '.');
+ return (str[0] == '$' && strchr("atd", str[1])
+ && (str[2] == '\0' || str[2] == '.')
+ )
+ || (0 == strncmp(str, "__ksymtab_", sizeof("__ksymtab_")-1))
+ || (0 == strncmp(str, "__kstrtab_", sizeof("__kstrtab_")-1))
+ || (0 == strncmp(str, "__kcrctab_", sizeof("__kcrctab_")-1))
+ || (0 == strncmp(str, "__devices_", sizeof("__devices_")-1))
+ || (0 == strncmp(str, "__devicestr_", sizeof("__devicestr_")-1))
+ || (0 == strncmp(str, "__vendorstr_", sizeof("__vendorstr_")-1))
+ || (0 == strncmp(str, "__pci_fixup_PCI_", sizeof("__pci_fixup_PCI_")-1))
+ || (0 == strncmp(str, "__func__", sizeof("__func__")-1))
+ ;
}
static int
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