linux-kernel - Re: [GIT PULL] x86/mm changes for v4.14: PCID support, 5-level paging support, Secure Memory Encryption support

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Message-ID: <CA+55aFy523JRWYpgbevLe09CNk=xpu9J+3uXLkqFbrM8ZWtXBw@mail.gmail.com>
Date:   Tue, 5 Sep 2017 15:33:41 -0700
From:   Linus Torvalds <torvalds@...ux-foundation.org>
To:     Ingo Molnar <mingo@...nel.org>
Cc:     Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        "H. Peter Anvin" <hpa@...or.com>,
        Peter Zijlstra <a.p.zijlstra@...llo.nl>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Andy Lutomirski <luto@...nel.org>,
        Borislav Petkov <bp@...en8.de>
Subject: Re: [GIT PULL] x86/mm changes for v4.14: PCID support, 5-level paging
 support, Secure Memory Encryption support

On Tue, Sep 5, 2017 at 2:45 PM, Linus Torvalds
<torvalds@...ux-foundation.org> wrote:
>
> I have bisected a bit deeper, and the pcid code is definitely in that
> bisection window still. But are a fair number of other commits (about
> 160 right now)

Now down to 18.

And one of those 18 is commit 10af6235e0d3 ("x86/mm: Implement PCID
based optimization: try to preserve old TLB entries using PCID"),
which I guess is where the problem might actually start showing up if
it is pcid.

I'll continue to bisect rather than just test "nopcid", because I want
to get that bisection result regardless.

            Linus