From: Cyrill Gorcunov <gorcunov@gmail.com>
To: Ingo Molnar <mingo@kernel.org>
Cc: "Kirill A. Shutemov" <kirill@shutemov.name>,
Peter Zijlstra <peterz@infradead.org>,
kirill.shutemov@linux.intel.com, luto@amacapital.net,
keescook@chromium.org, willy@infradead.org,
torvalds@linux-foundation.org, tglx@linutronix.de, bp@suse.de,
andy.shevchenko@gmail.com, linux-kernel@vger.kernel.org,
hpa@zytor.com, ebiederm@xmission.com, jgross@suse.com,
linux-tip-commits@vger.kernel.org
Subject: Re: [tip:x86/mm] x86/boot/compressed/64: Describe the logic behind the LA57 check
Date: Mon, 12 Mar 2018 17:52:22 +0300 [thread overview]
Message-ID: <20180312145222.GC22761@uranus.lan> (raw)
In-Reply-To: <20180312143212.77z2ptyqbsbqdll3@gmail.com>
On Mon, Mar 12, 2018 at 03:32:12PM +0100, Ingo Molnar wrote:
>
> * Kirill A. Shutemov <kirill@shutemov.name> wrote:
>
> > > We can of course bike shed / benchmark this once my desktop refresh
> > > sports this feature, but ISTR this being one of the very first things
> > > Ingo mentioned when we started this whole 5L thing.
> >
> > I would rather not fix the problem that may not actually exist. :)
>
> That 5 level pagetables involve more overhead is a realy problem.
>
> By default we should only enable 5-level paging if memory mappings exist in
> the memory map that require the extended physical memory space.
Does it mean that if a machine supports 5lvl but has phisycal memory
installed fitting the 4lvl space, and has memory hotplug supported,
adding more memory won't have effect until next reboot?
next prev parent reply other threads:[~2018-03-12 14:52 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
2018-03-12 17:21 ` Dave Hansen
2018-03-12 14:52 ` Cyrill Gorcunov [this message]
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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