linux-kernel - Re: [PATCH v3 16/26] objtool: Optimize find_rela_by_dest

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Message-ID: <alpine.LSU.2.21.2003251319040.21800@pobox.suse.cz>
Date:   Wed, 25 Mar 2020 13:19:16 +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 16/26] objtool: Optimize find_rela_by_dest_range()

On Tue, 24 Mar 2020, Peter Zijlstra wrote:

> Perf shows there is significant time in find_rela_by_dest(); this is
> because we have to iterate the address space per byte, looking for
> relocation entries.
> 
> Optimize this by reducing the address space granularity.
> 
> This reduces objtool on vmlinux.o runtime from 4.8 to 4.4 seconds.
> 
> Signed-off-by: Peter Zijlstra (Intel) <peterz@...radead.org>
> Acked-by: Josh Poimboeuf <jpoimboe@...hat.com>

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

M