From: Ingo Molnar <mingo@kernel.org>
To: Linus Torvalds <torvalds@linux-foundation.org>
Cc: "Andy Lutomirski" <luto@kernel.org>,
"Kirill A. Shutemov" <kirill.shutemov@linux.intel.com>,
"Kirill A. Shutemov" <kirill@shutemov.name>,
"Peter Zijlstra" <peterz@infradead.org>,
"Cyrill Gorcunov" <gorcunov@openvz.org>,
"Kees Cook" <keescook@chromium.org>,
"Matthew Wilcox" <willy@infradead.org>,
"Thomas Gleixner" <tglx@linutronix.de>,
"Borislav Petkov" <bp@suse.de>,
"Andy Shevchenko" <andy.shevchenko@gmail.com>,
"Linux Kernel Mailing List" <linux-kernel@vger.kernel.org>,
"Peter Anvin" <hpa@zytor.com>,
"Eric W. Biederman" <ebiederm@xmission.com>,
"Jürgen Groß" <jgross@suse.com>,
linux-tip-commits@vger.kernel.org,
"Dave Hansen" <dave.hansen@intel.com>
Subject: Re: [tip:x86/mm] x86/boot/compressed/64: Describe the logic behind the LA57 check
Date: Mon, 12 Mar 2018 18:41:20 +0100 [thread overview]
Message-ID: <20180312174120.wtopp54bskk5a5fu@gmail.com> (raw)
In-Reply-To: <CA+55aFya-fZQVi45axVpv4PF_b8yhHfDxx3xCTX+gbN5Ec9VUQ@mail.gmail.com>
* Linus Torvalds <torvalds@linux-foundation.org> wrote:
> But regardless, I think we're better off with a "wait and see" approach.
>
> IOW, try to use 5-level whenever possible for now, and _if_ somebody actually
> can show that 4-level page tables perform better or have some other advantage,
> we can then try to be clever later when it's all tested and it's just an
> optimization, not a "that code won't even run normally and gets basically zero
> coverage".
Ok, fair enough - and the testing argument makes sense as well.
Thanks,
Ingo
next prev parent reply other threads:[~2018-03-12 17:41 UTC|newest]
Thread overview: 28+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-02-26 18:04 [PATCH 0/5] x86/boot/compressed/64: Prepare trampoline memory Kirill A. Shutemov
2018-02-26 18:04 ` [PATCH 1/5] x86/boot/compressed/64: Describe the logic behind LA57 check Kirill A. Shutemov
2018-03-12 9:27 ` [tip:x86/mm] x86/boot/compressed/64: Describe the logic behind the " tip-bot for Kirill A. Shutemov
2018-03-12 12:40 ` Peter Zijlstra
2018-03-12 12:43 ` Kirill A. Shutemov
2018-03-12 13:10 ` Peter Zijlstra
2018-03-12 14:04 ` Kirill A. Shutemov
2018-03-12 14:32 ` Ingo Molnar
2018-03-12 14:50 ` Kirill A. Shutemov
2018-03-12 16:42 ` Linus Torvalds
2018-03-12 17:06 ` Andy Lutomirski
2018-03-12 17:12 ` Linus Torvalds
2018-03-12 17:41 ` Ingo Molnar [this message]
2018-03-12 17:21 ` Dave Hansen
2018-03-12 14:52 ` Cyrill Gorcunov
2018-02-26 18:04 ` [PATCH 2/5] x86/boot/compressed/64: Find a place for 32-bit trampoline Kirill A. Shutemov
2018-02-26 22:30 ` Borislav Petkov
2018-02-27 8:14 ` Kirill A. Shutemov
2018-03-12 9:28 ` [tip:x86/mm] " tip-bot for Kirill A. Shutemov
2018-02-26 18:04 ` [PATCH 3/5] x86/boot/compressed/64: Save and restore trampoline memory Kirill A. Shutemov
2018-03-12 9:29 ` [tip:x86/mm] " tip-bot for Kirill A. Shutemov
2018-02-26 18:04 ` [PATCH 4/5] x86/boot/compressed/64: Set up " Kirill A. Shutemov
2018-03-12 9:29 ` [tip:x86/mm] " tip-bot for Kirill A. Shutemov
2018-02-26 18:04 ` [PATCH 5/5] x86/boot/compressed/64: Prepare new top-level page table for trampoline Kirill A. Shutemov
2018-03-12 9:30 ` [tip:x86/mm] " tip-bot for Kirill A. Shutemov
2018-02-26 19:32 ` [PATCH 0/5] x86/boot/compressed/64: Prepare trampoline memory Borislav Petkov
2018-02-26 20:55 ` Kirill A. Shutemov
2018-02-27 9:32 ` Borislav Petkov
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