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objtool: Resize insn_hash 

Perf shows we're spending a lot of time in find_insn() and the
statistics show we have around 3.2 million instruction. Increase the
hash table size to reduce the bucket load from around 50 to 3.

This shaves about 2s off of objtool on vmlinux.o runtime, down to 16s.

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/20200324160924.617882545@infradead.org
This commit is contained in:
Peter Zijlstra 2020-03-12 10:20:46 +01:00
parent 53d20720bb
commit 513b5ca6b5
1 changed files with 1 additions and 1 deletions
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2
tools/objtool/check.h
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@ -50,7 +50,7 @@ struct instruction {
struct objtool_file {
struct elf *elf;
struct list_head insn_list;
DECLARE_HASHTABLE(insn_hash, 16);
DECLARE_HASHTABLE(insn_hash, 20);
bool ignore_unreachables, c_file, hints, rodata;
};