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Date: Thu, 9 Sep 2021 12:44:46 +0200
From: Borislav Petkov <bp@...en8.de>
To: Luming Yu <luming.yu@...il.com>
Cc: Jinhua Wu <wujinhua@...ux.alibaba.com>,
the arch/x86 maintainers <x86@...nel.org>,
zelin.deng@...ux.alibaba.com, jiayu.ni@...ux.alibaba.com,
Andi Kleen <ak@...ux.intel.com>,
Luming Yu <luming.yu@...el.com>, fan.du@...el.com,
artie.ding@...ux.alibaba.com, "Luck, Tony" <tony.luck@...el.com>,
Thomas Gleixner <tglx@...utronix.de>,
LKML <linux-kernel@...r.kernel.org>,
pawan.kumar.gupta@...ux.intel.com,
"Yu, Fenghua" <fenghua.yu@...el.com>,
"H. Peter Anvin" <hpa@...or.com>,
ricardo.neri-calderon@...ux.intel.com,
Peter Zijlstra <peterz@...radead.org>
Subject: Re: [PATCH] perf: optimize clear page in Intel specified model with
movq instruction
On Thu, Sep 09, 2021 at 06:34:40PM +0800, Luming Yu wrote:
> do you mean jump label would not be replaced to nop when its key is enabled?
> so we could not use it in certain functions?
> I don't understand exactly what "ain't gonna happen"
It means, you need to use an X86_FEATURE_ bit because I won't accept a
static key.
But do the benchmarks first.
--
Regards/Gruss,
Boris.
https://people.kernel.org/tglx/notes-about-netiquette
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