linux-kernel - Re: [PATCH v3 10/26] objtool: Optimize find_symbol_*() and read

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Message-ID: <alpine.LSU.2.21.2003251120160.12098@pobox.suse.cz>
Date:   Wed, 25 Mar 2020 11:20:31 +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 10/26] objtool: Optimize find_symbol_*() and
 read_symbols()

On Tue, 24 Mar 2020, Peter Zijlstra wrote:

> All of:
> 
>   read_symbols(), find_symbol_by_offset(), find_symbol_containing(),
>   find_containing_func()
> 
> do a linear search of the symbols. Add an RB tree to make it go
> faster.
> 
> This about halves objtool runtime on vmlinux.o, from 34s to 18s.
> 
> Signed-off-by: Peter Zijlstra (Intel) <peterz@...radead.org>
> Acked-by: Josh Poimboeuf <jpoimboe@...hat.com>

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

M