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Date: Tue, 22 Sep 2015 10:41:21 -0700
Message-ID: <CA+55aFz2YH6F1L7JULQZOUMqyqeR+2LL2GWeg+QV1T8aRkJw1w@mail.gmail.com>
Subject: Re: [PATCH 01/11] x86/mm/pat: Don't free PGD entries on memory unmap
From: Linus Torvalds <torvalds@linux-foundation.org>
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To: Ingo Molnar <mingo@kernel.org>
Cc: Linux Kernel Mailing List <linux-kernel@vger.kernel.org>, linux-mm <linux-mm@kvack.org>, Andy Lutomirski <luto@amacapital.net>, Andrew Morton <akpm@linux-foundation.org>, Denys Vlasenko <dvlasenk@redhat.com>, Brian Gerst <brgerst@gmail.com>, Peter Zijlstra <peterz@infradead.org>, Borislav Petkov <bp@alien8.de>, "H. Peter Anvin" <hpa@zytor.com>, Oleg Nesterov <oleg@redhat.com>, Waiman Long <waiman.long@hp.com>, Thomas Gleixner <tglx@linutronix.de>

On Mon, Sep 21, 2015 at 11:23 PM, Ingo Molnar <mingo@kernel.org> wrote:
>
> This complicates PGD management, so don't do this. We can keep the
> PGD mapped and the PUD table all clear - it's only a single 4K page
> per 512 GB of memory mapped.

I'm ok with this just from a "it removes code" standpoint.  That said,
some of the other patches here make me go "hmm". I'll answer them
separately.

                  Linus

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