From: Konrad Rzeszutek Wilk <konrad@kernel.org>
To: Yinghai Lu <yinghai@kernel.org>
Cc: Thomas Gleixner <tglx@linutronix.de>, Ingo Molnar <mingo@elte.hu>,
"H. Peter Anvin" <hpa@zytor.com>, Jacob Shin <jacob.shin@amd.com>,
Tejun Heo <tj@kernel.org>,
Stefano Stabellini <stefano.stabellini@eu.citrix.com>,
linux-kernel@vger.kernel.org
Subject: Re: [PATCH 03/10] x86, mm: get early page table from BRK
Date: Thu, 11 Oct 2012 10:41:32 -0400 [thread overview]
Message-ID: <20121011144130.GB2408@localhost.localdomain> (raw)
In-Reply-To: <CAE9FiQVTUsYZiU0rAjE645Pez1X5eLwHMhOF0W_EuR62KYdtQQ@mail.gmail.com>
On Wed, Oct 10, 2012 at 08:49:05AM -0700, Yinghai Lu wrote:
> On Wed, Oct 10, 2012 at 7:17 AM, Konrad Rzeszutek Wilk
> <konrad@kernel.org> wrote:
> > On Tue, Oct 09, 2012 at 06:03:33PM -0700, Yinghai Lu wrote:
>
> >> good point, i add one line comment to the revised patch.
> >>
> >> +/* need 3 4k for initial PMD_SIZE, 4k for 0-ISA_END_ADDRESS */
> >
> > Can you explain the math please? It sounds like this is based on
> > the assumption that this you are using huge pages. But what if you
> > are not? What if you can only do 4KB pages?
>
> yes that is some extreme case:
> assume that 2M range is [2T-2M, 2T),
What is T in here? Terabyte? Is the '[' vs ')' a significance in your
explanation? Should it be '[2T-2M, 2T]' ?
> one page for PGD-[2T-512g, 2T), one for PUD - [2T-1G, 2T), and one for
> PMD -: [2T-2M, 2T)
next prev parent reply other threads:[~2012-10-11 14:41 UTC|newest]
Thread overview: 33+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-10-09 4:39 [PATCH -v2 00/10] x86: Use BRK to pre mapping page table to make xen happy Yinghai Lu
2012-10-09 4:39 ` [PATCH 01/10] x86, mm: align start address to correct big page size Yinghai Lu
2012-10-09 4:39 ` [PATCH 02/10] x86, mm: Use big page size for small memory range Yinghai Lu
2012-10-09 4:39 ` [PATCH 03/10] x86, mm: get early page table from BRK Yinghai Lu
2012-10-09 16:01 ` Konrad Rzeszutek Wilk
2012-10-10 1:03 ` Yinghai Lu
2012-10-10 14:17 ` Konrad Rzeszutek Wilk
2012-10-10 15:49 ` Yinghai Lu
2012-10-11 14:41 ` Konrad Rzeszutek Wilk [this message]
2012-10-11 22:55 ` Yinghai Lu
2012-10-11 23:18 ` H. Peter Anvin
2012-10-09 4:39 ` [PATCH 04/10] x86, mm: Don't clear page table if next range is ram Yinghai Lu
2012-10-09 16:04 ` Konrad Rzeszutek Wilk
2012-10-10 1:08 ` Yinghai Lu
2012-10-09 4:39 ` [PATCH 05/10] x86, mm: Remove early_memremap workaround for page table accessing Yinghai Lu
2012-10-09 4:39 ` [PATCH 06/10] x86, mm: only keep initial mapping for ram Yinghai Lu
2012-10-09 4:39 ` [PATCH 07/10] x86, xen, mm: Do not need to check if page table is ioremap Yinghai Lu
2012-10-09 16:13 ` Konrad Rzeszutek Wilk
2012-10-09 4:39 ` [PATCH 08/10] x86, xen, mm: fix mapping_pagetable_reserve logic Yinghai Lu
2012-10-09 6:12 ` H. Peter Anvin
2012-10-09 6:33 ` Yinghai Lu
2012-10-09 7:22 ` H. Peter Anvin
2012-10-09 12:22 ` Stefano Stabellini
2012-10-09 14:15 ` H. Peter Anvin
2012-10-09 4:39 ` [PATCH 09/10] x86, mm: Hide pgt_buf_* into internal to xen Yinghai Lu
2012-10-09 4:39 ` [PATCH 10/10] x86, mm: Add early_pgt_buf_* Yinghai Lu
2012-10-09 6:07 ` [PATCH -v2 00/10] x86: Use BRK to pre mapping page table to make xen happy H. Peter Anvin
2012-10-09 6:21 ` Yinghai Lu
2012-10-09 6:25 ` H. Peter Anvin
2012-10-09 6:45 ` Yinghai Lu
2012-10-09 12:19 ` Stefano Stabellini
2012-10-09 18:27 ` Yinghai Lu
2012-10-10 0:00 ` Yinghai Lu
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=20121011144130.GB2408@localhost.localdomain \
--to=konrad@kernel.org \
--cc=hpa@zytor.com \
--cc=jacob.shin@amd.com \
--cc=linux-kernel@vger.kernel.org \
--cc=mingo@elte.hu \
--cc=stefano.stabellini@eu.citrix.com \
--cc=tglx@linutronix.de \
--cc=tj@kernel.org \
--cc=yinghai@kernel.org \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox
all inboxes | Powered by JetHome®