linux-kernel - Re: [PATCH v3 12/26] objtool: Resize insn

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Message-ID: <alpine.LSU.2.21.2003251121440.12098@pobox.suse.cz>
Date:   Wed, 25 Mar 2020 11:21:52 +0100 (CET)
From:   Miroslav Benes <mbenes@...e.cz>
To:     Peter Zijlstra <peterz@...radead.org>
cc:     tglx@...utronix.de, jpoimboe@...hat.com,
        linux-kernel@...r.kernel.org, x86@...nel.org, mhiramat@...nel.org,
        brgerst@...il.com
Subject: Re: [PATCH v3 12/26] objtool: Resize insn_hash

On Tue, 24 Mar 2020, Peter Zijlstra wrote:

> 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@...radead.org>
> Acked-by: Josh Poimboeuf <jpoimboe@...hat.com>

Reviewed-by: Miroslav Benes <mbenes@...e.cz>

M