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| author | jdp <jdp@FreeBSD.org> | 2001-05-05 23:21:05 +0000 |
|---|---|---|
| committer | jdp <jdp@FreeBSD.org> | 2001-05-05 23:21:05 +0000 |
| commit | 66a962ce675f3386156405c78fe7d7a1e6a852bb (patch) | |
| tree | 661ed94ee85164ded5139aff0e44eefd488583a9 /libexec/rtld-elf/alpha | |
| parent | da4bd71ba54c6cef03c8b248a7dd42b16a7b348e (diff) | |
| download | FreeBSD-src-66a962ce675f3386156405c78fe7d7a1e6a852bb.zip FreeBSD-src-66a962ce675f3386156405c78fe7d7a1e6a852bb.tar.gz | |
Performance improvements for the ELF dynamic linker. These
particularly help programs which load many shared libraries with
a lot of relocations. Large C++ programs such as are found in KDE
are a prime example.
While relocating a shared object, maintain a vector of symbols
which have already been looked up, directly indexed by symbol
number. Typically, symbols which are referenced by a relocation
entry are referenced by many of them. This is the same optimization
I made to the a.out dynamic linker in 1995 (rtld.c revision 1.30).
Also, compare the first character of a sought-after symbol with its
symbol table entry before calling strcmp().
On a PII/400 these changes reduce the start-up time of a typical
KDE program from 833 msec (elapsed) to 370 msec.
MFC after: 5 days
Diffstat (limited to 'libexec/rtld-elf/alpha')
| -rw-r--r-- | libexec/rtld-elf/alpha/reloc.c | 15 |
1 files changed, 11 insertions, 4 deletions
diff --git a/libexec/rtld-elf/alpha/reloc.c b/libexec/rtld-elf/alpha/reloc.c index e27f922..f963476 100644 --- a/libexec/rtld-elf/alpha/reloc.c +++ b/libexec/rtld-elf/alpha/reloc.c @@ -71,6 +71,11 @@ static int reloc_non_plt_obj(Obj_Entry *obj_rtld, Obj_Entry *obj, const Elf_Rela *rela) { Elf_Addr *where = (Elf_Addr *) (obj->relocbase + rela->r_offset); + SymCache *cache; + + cache = (SymCache *)alloca(obj->nchains * sizeof(SymCache)); + if (cache != NULL) + memset(cache, 0, obj->nchains * sizeof(SymCache)); switch (ELF_R_TYPE(rela->r_info)) { @@ -82,7 +87,7 @@ reloc_non_plt_obj(Obj_Entry *obj_rtld, Obj_Entry *obj, const Elf_Rela *rela) const Obj_Entry *defobj; def = find_symdef(ELF_R_SYM(rela->r_info), obj, - &defobj, false); + &defobj, false, cache); if (def == NULL) return -1; store64(where, @@ -97,7 +102,7 @@ reloc_non_plt_obj(Obj_Entry *obj_rtld, Obj_Entry *obj, const Elf_Rela *rela) Elf_Addr val; def = find_symdef(ELF_R_SYM(rela->r_info), obj, - &defobj, false); + &defobj, false, cache); if (def == NULL) return -1; val = (Elf_Addr) (defobj->relocbase + def->st_value + @@ -228,7 +233,8 @@ reloc_jmpslots(Obj_Entry *obj) assert(ELF_R_TYPE(rel->r_info) == R_ALPHA_JMP_SLOT); where = (Elf_Addr *)(obj->relocbase + rel->r_offset); - def = find_symdef(ELF_R_SYM(rel->r_info), obj, &defobj, true); + def = find_symdef(ELF_R_SYM(rel->r_info), obj, &defobj, true, + NULL); if (def == NULL) return -1; reloc_jmpslot(where, @@ -246,7 +252,8 @@ reloc_jmpslots(Obj_Entry *obj) assert(ELF_R_TYPE(rela->r_info) == R_ALPHA_JMP_SLOT); where = (Elf_Addr *)(obj->relocbase + rela->r_offset); - def = find_symdef(ELF_R_SYM(rela->r_info), obj, &defobj, true); + def = find_symdef(ELF_R_SYM(rela->r_info), obj, &defobj, true, + NULL); if (def == NULL) return -1; reloc_jmpslot(where, |
