From: dhylands@gmail.com (Dave Hylands)
To: kernelnewbies@lists.kernelnewbies.org
Subject: Question about page count
Date: Tue, 21 Jun 2011 06:23:34 -0700 [thread overview]
Message-ID: <BANLkTi=diyfECSXUqFNxEKwy9Efh89EcDw@mail.gmail.com> (raw)
In-Reply-To: <BANLkTi=NqaNz-2uEPduwgidcm2bDEZeyMQ@mail.gmail.com>
Hey Mulyadi,
On Mon, Jun 20, 2011 at 10:15 PM, Mulyadi Santosa
<mulyadi.santosa@gmail.com> wrote:
...snip...
> looking at how page_count implemented, it checks whether the related
> page is gonna be reclaimed or a compound page (not sure what it is).
> If so, returns the first page of that "page".
On the ARM, you can setup the MMU to map 1Mb regions or 4Kb regions. A
1 Mb region only goes through the top level of the MMU, whereas a 4K
page has to go through 2 levesl, so accessing pages through the 1 Mb
mapping is faster.
I believe (I'm not 100% sure) that the 256 x 4K pages that make up the
1Mb region are a compound page.
--
Dave Hylands
Shuswap, BC, Canada
http://www.davehylands.com
next prev parent reply other threads:[~2011-06-21 13:23 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-06-20 13:10 Question about page count Jui-Hao Chiang
2011-06-21 1:46 ` Wick
2011-06-21 5:15 ` Mulyadi Santosa
2011-06-21 13:23 ` Dave Hylands [this message]
2011-06-21 16:34 ` Mulyadi Santosa
2011-06-21 14:25 ` Jui-Hao Chiang
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='BANLkTi=diyfECSXUqFNxEKwy9Efh89EcDw@mail.gmail.com' \
--to=dhylands@gmail.com \
--cc=kernelnewbies@lists.kernelnewbies.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;
as well as URLs for NNTP newsgroup(s).