From: Benjamin Herrenschmidt <benh@kernel.crashing.org>
To: Ankita Garg <ankita@in.ibm.com>
Cc: linuxppc-dev@ozlabs.org, linux-mm@kvack.org
Subject: Re: Reserved pages in PowerPC
Date: Thu, 16 Sep 2010 20:04:24 +1000 [thread overview]
Message-ID: <1284631464.30449.85.camel@pasglop> (raw)
In-Reply-To: <20100916052311.GC2332@in.ibm.com>
On Thu, 2010-09-16 at 10:53 +0530, Ankita Garg wrote:
>
> With some debugging I found that that section has reserved pages. On
> instrumenting the memblock_reserve() and reserve_bootmem() routines, I can see
> that many of the memory areas are reserved for kernel and initrd by the
> memblock reserve() itself. reserve_bootmem then looks at the pages already
> reserved and marks them reserved. However, for the very last section, I see
> that bootmem reserves it but I am unable to find a corresponding reservation
> by the memblock code.
It's probably RTAS (firmware runtime services). I'ts instanciated at
boot from prom_init and we do favor high addresses for it below 1G iirc.
Cheers,
Ben.
next prev parent reply other threads:[~2010-09-16 10:04 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-09-16 5:23 Reserved pages in PowerPC Ankita Garg
2010-09-16 10:04 ` Benjamin Herrenschmidt [this message]
2010-09-16 12:08 ` Ankita Garg
2010-09-16 21:52 ` Benjamin Herrenschmidt
2010-09-28 10:28 ` Ankita Garg
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=1284631464.30449.85.camel@pasglop \
--to=benh@kernel.crashing.org \
--cc=ankita@in.ibm.com \
--cc=linux-mm@kvack.org \
--cc=linuxppc-dev@ozlabs.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).