linux-kernel - Re: [v2] x86/cpufeature: Add AVX512_4VNNIW and AVX512

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Message-ID: <20161018130818.GA25251@gmail.com>
Date:   Tue, 18 Oct 2016 15:08:18 +0200
From:   Ingo Molnar <mingo@...nel.org>
To:     "Luc, Piotr" <Piotr.Luc@...el.com>
Cc:     "x86@...nel.org" <x86@...nel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "peterz@...radead.org" <peterz@...radead.org>,
        "torvalds@...ux-foundation.org" <torvalds@...ux-foundation.org>,
        "tglx@...utronix.de" <tglx@...utronix.de>,
        "jpoimboe@...hat.com" <jpoimboe@...hat.com>,
        "hpa@...or.com" <hpa@...or.com>,
        "brgerst@...il.com" <brgerst@...il.com>,
        "mingo@...hat.com" <mingo@...hat.com>,
        "luto@...nel.org" <luto@...nel.org>, "bp@...en8.de" <bp@...en8.de>,
        "Hansen, Dave" <dave.hansen@...el.com>,
        "dvlasenk@...hat.com" <dvlasenk@...hat.com>
Subject: Re: [v2] x86/cpufeature: Add AVX512_4VNNIW and AVX512_4FMAPS
 features.


* Luc, Piotr <Piotr.Luc@...el.com> wrote:

> On Mon, 2016-10-17 at 17:03 +0200, Piotr Luc wrote:
> > v2: Initialize new bits in the scattered group. Add
> 
> The commit message is obviously broken. Sorry for that.
> I will resend with fixed message.

In the v3 patchlog please also please describe to what extent new instructions are 
enabled by the patch when run on real hardware (or on a simulator).

I.e. can user-space run those new instructions, while it couldn't before - or is 
the patch purely for /proc/cpuinfo enumeration?

I.e. a comprehensive before/after comparison.

Thanks,

	Ingo