From 1e11f3fdc326d7466e43185ea943b6156143387c Mon Sep 17 00:00:00 2001
From: Peter Zijlstra <peterz@infradead.org>
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) <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
---
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 <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;
--
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