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| author | Peter Zijlstra <peterz@infradead.org> | 2020-03-12 09:32:10 +0100 |
|---|---|---|
| committer | Peter Zijlstra <peterz@infradead.org> | 2020-03-25 18:28:29 +0100 |
| commit | ae358196fac3a0b4d2a7d47a4f401e3421027b03 (patch) | |
| tree | 183b84e1a566c504bffc71cb65afea6270d96135 /tools/objtool/elf.h | |
| parent | 530389968739883a61192767e1c215653ba4ba2b (diff) | |
| download | linux-ae358196fac3a0b4d2a7d47a4f401e3421027b03.tar.bz2 | |
objtool: Optimize find_section_by_name()
In order to avoid yet another linear search of (20k) sections, add a
name based hash.
This reduces objtool runtime on vmlinux.o by some 10s to around 35s.
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/20200324160924.440174280@infradead.org
Diffstat (limited to 'tools/objtool/elf.h')
| -rw-r--r-- | tools/objtool/elf.h | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/tools/objtool/elf.h b/tools/objtool/elf.h index 8c272eb515c8..ac7c46f7d9ab 100644 --- a/tools/objtool/elf.h +++ b/tools/objtool/elf.h @@ -10,6 +10,7 @@ #include <gelf.h> #include <linux/list.h> #include <linux/hashtable.h> +#include <linux/jhash.h> #ifdef LIBELF_USE_DEPRECATED # define elf_getshdrnum elf_getshnum @@ -26,6 +27,7 @@ struct section { struct list_head list; struct hlist_node hash; + struct hlist_node name_hash; GElf_Shdr sh; struct list_head symbol_list; struct list_head rela_list; @@ -73,6 +75,7 @@ struct elf { struct list_head sections; DECLARE_HASHTABLE(symbol_hash, 20); DECLARE_HASHTABLE(section_hash, 16); + DECLARE_HASHTABLE(section_name_hash, 16); }; |