Commit 513b5ca6 authored Mar 12, 2020 by Peter Zijlstra

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

parent 53d20720

tools/objtool/check.h

+1 −1

Original line number	Diff line number	Diff line
		@@ -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;
		};

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