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objtool: Add a statistics mode

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Have it print a few numbers which can be used to size the hashtables.

Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Reviewed-by: Miroslav Benes <mbenes@suse.cz>
Acked-by: Josh Poimboeuf <jpoimboe@redhat.com>
Link: https://lkml.kernel.org/r/20200324160924.321381240@infradead.org
This commit is contained in:
Peter Zijlstra
2020-03-12 09:26:29 +01:00
parent 65fb11a7f6
commit 1e11f3fdc3
4 changed files with 25 additions and 3 deletions
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18
tools/objtool/elf.c
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@@ -15,6 +15,7 @@
#include <string.h>
#include <unistd.h>
#include <errno.h>
#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;