linux-kernel - Re: Linux 6.11-rc1

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Message-ID: <20240731212624.GZ40213@noisy.programming.kicks-ass.net>
Date: Wed, 31 Jul 2024 23:26:24 +0200
From: Peter Zijlstra <peterz@...radead.org>
To: Linus Torvalds <torvalds@...ux-foundation.org>
Cc: Thomas Gleixner <tglx@...utronix.de>,
	Guenter Roeck <linux@...ck-us.net>, Jens Axboe <axboe@...nel.dk>,
	Andy Lutomirski <luto@...nel.org>, Ingo Molnar <mingo@...hat.com>,
	Peter Anvin <hpa@...or.com>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	the arch/x86 maintainers <x86@...nel.org>
Subject: Re: Linux 6.11-rc1

On Wed, Jul 31, 2024 at 02:23:02PM -0700, Linus Torvalds wrote:
> On Wed, 31 Jul 2024 at 14:20, Peter Zijlstra <peterz@...radead.org> wrote:
> >
> > The alternative is ripping that level thing out entirely, and simply
> > duplicate anything we find in the page-tables.
> 
> That looks clean to me, and don't we want to clone the minimal range
> anyway - even on x86-64?

x86_64 has everything PMD aligned. It *should* never encounter a PTE.

Also, this thing blindly clones the format the kernel page-tables have,
it will not split a PMD into multiple PTE entries just to clone a
smaller range. It is super simple.