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| author | Josh Poimboeuf <jpoimboe@kernel.org> | 2023-05-30 10:20:57 -0700 |
|---|---|---|
| committer | Josh Poimboeuf <jpoimboe@kernel.org> | 2023-06-07 10:03:16 -0700 |
| commit | eb0481bbc4ce386e73e28ad8590b4f12c8aded56 (patch) | |
| tree | 45ddec66591071900378c3aeef5bc9a7b5ea5add /tools/objtool | |
| parent | 53257a977a69b5eabbaafb64dcd767d2a4fef2b3 (diff) | |
| download | linux-eb0481bbc4ce386e73e28ad8590b4f12c8aded56.tar.gz linux-eb0481bbc4ce386e73e28ad8590b4f12c8aded56.tar.bz2 linux-eb0481bbc4ce386e73e28ad8590b4f12c8aded56.zip | |
objtool: Fix reloc_hash size
With CONFIG_DEBUG_INFO, DWARF creates a lot of relocations and
reloc_hash is woefully undersized, which can affect performance
significantly. Fix that.
Link: https://lore.kernel.org/r/38ef60dc8043270bf3b9dfd139ae2a30ca3f75cc.1685464332.git.jpoimboe@kernel.org
Signed-off-by: Josh Poimboeuf <jpoimboe@kernel.org>
Diffstat (limited to 'tools/objtool')
| -rw-r--r-- | tools/objtool/elf.c | 16 | ||||
| -rw-r--r-- | tools/objtool/include/objtool/elf.h | 8 |
2 files changed, 14 insertions, 10 deletions
diff --git a/tools/objtool/elf.c b/tools/objtool/elf.c index 4bbdd8e6df2c..f72ec6d8fb14 100644 --- a/tools/objtool/elf.c +++ b/tools/objtool/elf.c @@ -328,12 +328,12 @@ static int read_sections(struct elf *elf) } } - if (sec->sh.sh_flags & SHF_EXECINSTR) - elf->text_size += sec->sh.sh_size; - list_add_tail(&sec->list, &elf->sections); elf_hash_add(section, &sec->hash, sec->idx); elf_hash_add(section_name, &sec->name_hash, str_hash(sec->name)); + + if (is_reloc_sec(sec)) + elf->num_relocs += sec->sh.sh_size / sec->sh.sh_entsize; } if (opts.stats) { @@ -888,19 +888,18 @@ static int read_reloc(struct section *rsec, int i, struct reloc *reloc) static int read_relocs(struct elf *elf) { - unsigned long nr_reloc, max_reloc = 0, tot_reloc = 0; + unsigned long nr_reloc, max_reloc = 0; struct section *rsec; struct reloc *reloc; unsigned int symndx; struct symbol *sym; int i; - if (!elf_alloc_hash(reloc, elf->text_size / 16)) + if (!elf_alloc_hash(reloc, elf->num_relocs)) return -1; list_for_each_entry(rsec, &elf->sections, list) { - if ((rsec->sh.sh_type != SHT_RELA) && - (rsec->sh.sh_type != SHT_REL)) + if (!is_reloc_sec(rsec)) continue; rsec->base = find_section_by_index(elf, rsec->sh.sh_info); @@ -942,12 +941,11 @@ static int read_relocs(struct elf *elf) nr_reloc++; } max_reloc = max(max_reloc, nr_reloc); - tot_reloc += nr_reloc; } if (opts.stats) { printf("max_reloc: %lu\n", max_reloc); - printf("tot_reloc: %lu\n", tot_reloc); + printf("num_relocs: %lu\n", elf->num_relocs); printf("reloc_bits: %d\n", elf->reloc_bits); } diff --git a/tools/objtool/include/objtool/elf.h b/tools/objtool/include/objtool/elf.h index 6f82f2515d6b..b81d78b35126 100644 --- a/tools/objtool/include/objtool/elf.h +++ b/tools/objtool/include/objtool/elf.h @@ -90,8 +90,9 @@ struct elf { int fd; bool changed; char *name; - unsigned int text_size, num_files; + unsigned int num_files; struct list_head sections; + unsigned long num_relocs; int symbol_bits; int symbol_name_bits; @@ -158,6 +159,11 @@ static inline size_t elf_rela_size(struct elf *elf) return elf_addr_size(elf) == 4 ? sizeof(Elf32_Rela) : sizeof(Elf64_Rela); } +static inline bool is_reloc_sec(struct section *sec) +{ + return sec->sh.sh_type == SHT_RELA || sec->sh.sh_type == SHT_REL; +} + #define for_each_sec(file, sec) \ list_for_each_entry(sec, &file->elf->sections, list) |