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From: Ingo Molnar <mingo@kernel.org>
To: Thomas Gleixner <tglx@linutronix.de>
Cc: "Kirill A. Shutemov" <kirill@shutemov.name>,
	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 15:54:15 +0200	[thread overview]
Message-ID: <20170904135415.ek5shnbos3g7n2am@gmail.com> (raw)
In-Reply-To: <alpine.DEB.2.20.1709041500300.2189@nanos>


* Thomas Gleixner <tglx@linutronix.de> wrote:

> 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!"

Yeah, I mis-remembered the increase in number of bits, should have double checked ...

/me goes shopping

Thanks,

	Ingo

  reply	other threads:[~2017-09-04 13:54 UTC|newest]

Thread overview: 19+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2017-09-04  9:31 Ingo Molnar
2017-09-04 12:23 ` Kirill A. Shutemov
2017-09-04 13:01   ` Thomas Gleixner
2017-09-04 13:54     ` Ingo Molnar [this message]
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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