From: Thomas Gleixner <tglx@linutronix.de>
To: "Kirill A. Shutemov" <kirill@shutemov.name>
Cc: Ingo Molnar <mingo@kernel.org>,
Linus Torvalds <torvalds@linux-foundation.org>,
linux-kernel@vger.kernel.org, "H. Peter Anvin" <hpa@zytor.com>,
Peter Zijlstra <a.p.zijlstra@chello.nl>,
Andrew Morton <akpm@linux-foundation.org>,
Andy Lutomirski <luto@kernel.org>, Borislav Petkov <bp@alien8.de>
Subject: Re: [GIT PULL] x86/mm changes for v4.14: PCID support, 5-level paging support, Secure Memory Encryption support
Date: Mon, 4 Sep 2017 15:01:46 +0200 (CEST) [thread overview]
Message-ID: <alpine.DEB.2.20.1709041500300.2189@nanos> (raw)
In-Reply-To: <20170904122358.uscplql7tzrnimp4@node.shutemov.name>
On Mon, 4 Sep 2017, Kirill A. Shutemov wrote:
> On Mon, Sep 04, 2017 at 11:31:58AM +0200, Ingo Molnar wrote:
> > The main changes in this cycle are support for three new, complex hardware
> > features of x86 CPUs:
> >
> > - Add 5-level paging support, which is a new hardware feature on upcoming Intel
> > CPUs allowing up to 128 PB of virtual address space and 4 PB of physical RAM
> > space - a 256-fold increase over the old limits.
>
> Minor nitpick: I don't see where "256-fold" comes from.
>
> Virtual address space increased from 256 TB to 128 PB -- 512 times.
> Physical: 64 TB -> 4 PB -- 64 times.
See arch/x86/kernel/tsc.c:
-johnstul@us.ibm.com "math is hard, lets go shopping!"
next prev parent reply other threads:[~2017-09-04 13:01 UTC|newest]
Thread overview: 19+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-09-04 9:31 [GIT PULL] x86/mm changes for v4.14: PCID support, 5-level paging support, Secure Memory Encryption support Ingo Molnar
2017-09-04 12:23 ` Kirill A. Shutemov
2017-09-04 13:01 ` Thomas Gleixner [this message]
2017-09-04 13:54 ` Ingo Molnar
2017-09-05 21:17 ` Linus Torvalds
2017-09-05 21:37 ` Andy Lutomirski
2017-09-05 21:44 ` Borislav Petkov
2017-09-05 21:40 ` Ingo Molnar
2017-09-05 21:45 ` Linus Torvalds
2017-09-05 22:33 ` Linus Torvalds
2017-09-05 22:35 ` Andy Lutomirski
2017-09-05 23:09 ` Linus Torvalds
2017-09-06 20:43 ` Jiri Kosina
2017-09-06 21:16 ` Jiri Kosina
2017-09-06 22:26 ` Andy Lutomirski
2017-09-05 21:50 ` Linus Torvalds
2017-09-07 8:07 ` Ingo Molnar
2017-09-07 8:13 ` Ingo Molnar
2017-09-15 11:26 ` Pavel Machek
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