linux-kernel - Re: [GIT pull] perf/urgent for 5.7-rc2

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Message-ID: <20200420082728.GA20696@hirez.programming.kicks-ass.net>
Date:   Mon, 20 Apr 2020 10:27:28 +0200
From:   Peter Zijlstra <peterz@...radead.org>
To:     Ingo Molnar <mingo@...nel.org>
Cc:     Josh Poimboeuf <jpoimboe@...hat.com>,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Masahiro Yamada <masahiroy@...nel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        the arch/x86 maintainers <x86@...nel.org>
Subject: Re: [GIT pull] perf/urgent for 5.7-rc2

On Mon, Apr 20, 2020 at 09:48:45AM +0200, Ingo Molnar wrote:
> Fortunately, much of what objtool does against vmlinux.o can be 
> parallelized in a rather straightforward fashion I believe, if we build 
> with -ffunction-sections.

So that FGKASLR is going to get us -ffunction-sections, but
parallelizing objtool isn't going to be trivial, it's data structures
aren't really build for that, esp. decode_instructions() which actively
generates data.

Still, it's probably doable.