From 1e11f3fdc326d7466e43185ea943b6156143387c Mon Sep 17 00:00:00 2001 From: Peter Zijlstra Date: Thu, 12 Mar 2020 09:26:29 +0100 Subject: objtool: Add a statistics mode Have it print a few numbers which can be used to size the hashtables. Signed-off-by: Peter Zijlstra (Intel) Reviewed-by: Miroslav Benes Acked-by: Josh Poimboeuf Link: https://lkml.kernel.org/r/20200324160924.321381240@infradead.org --- tools/objtool/elf.c | 18 +++++++++++++++++- 1 file changed, 17 insertions(+), 1 deletion(-) (limited to 'tools/objtool/elf.c') diff --git a/tools/objtool/elf.c b/tools/objtool/elf.c index b188b3e075be..ff293064b469 100644 --- a/tools/objtool/elf.c +++ b/tools/objtool/elf.c @@ -15,6 +15,7 @@ #include #include #include +#include "builtin.h" #include "elf.h" #include "warn.h" @@ -202,6 +203,9 @@ static int read_sections(struct elf *elf) sec->len = sec->sh.sh_size; } + if (stats) + printf("nr_sections: %lu\n", (unsigned long)sections_nr); + /* sanity check, one more call to elf_nextscn() should return NULL */ if (elf_nextscn(elf->elf, s)) { WARN("section entry mismatch"); @@ -299,6 +303,9 @@ static int read_symbols(struct elf *elf) hash_add(elf->symbol_hash, &sym->hash, sym->idx); } + if (stats) + printf("nr_symbols: %lu\n", (unsigned long)symbols_nr); + /* Create parent/child links for any cold subfunctions */ list_for_each_entry(sec, &elf->sections, list) { list_for_each_entry(sym, &sec->symbol_list, list) { @@ -360,6 +367,7 @@ static int read_relas(struct elf *elf) struct rela *rela; int i; unsigned int symndx; + unsigned long nr_rela, max_rela = 0, tot_rela = 0; list_for_each_entry(sec, &elf->sections, list) { if (sec->sh.sh_type != SHT_RELA) @@ -374,6 +382,7 @@ static int read_relas(struct elf *elf) sec->base->rela = sec; + nr_rela = 0; for (i = 0; i < sec->sh.sh_size / sec->sh.sh_entsize; i++) { rela = malloc(sizeof(*rela)); if (!rela) { @@ -401,8 +410,15 @@ static int read_relas(struct elf *elf) list_add_tail(&rela->list, &sec->rela_list); hash_add(sec->rela_hash, &rela->hash, rela->offset); - + nr_rela++; } + max_rela = max(max_rela, nr_rela); + tot_rela += nr_rela; + } + + if (stats) { + printf("max_rela: %lu\n", max_rela); + printf("tot_rela: %lu\n", tot_rela); } return 0; -- cgit v1.2.3