From: Ankita Garg <ankita@in.ibm.com>
To: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Cc: linuxppc-dev@ozlabs.org, linux-mm@kvack.org
Subject: Re: Reserved pages in PowerPC
Date: Thu, 16 Sep 2010 17:38:06 +0530 [thread overview]
Message-ID: <20100916120806.GJ2332@in.ibm.com> (raw)
In-Reply-To: <1284631464.30449.85.camel@pasglop>
Hi Ben,
On Thu, Sep 16, 2010 at 08:04:24PM +1000, Benjamin Herrenschmidt wrote:
> 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.
>
Thanks Ben for taking a look at this. So I checked the rtas messages on
the serial console and see the following:
instantiating rtas at 0x000000000f632000... done
Which does not correspond to the higher addresses that I see as reserved
(observation on a 16G machine).
--
Regards,
Ankita Garg (ankita@in.ibm.com)
Linux Technology Center
IBM India Systems & Technology Labs,
Bangalore, India
WARNING: multiple messages have this Message-ID (diff)
From: Ankita Garg <ankita@in.ibm.com>
To: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Cc: linuxppc-dev@ozlabs.org, linux-mm@kvack.org
Subject: Re: Reserved pages in PowerPC
Date: Thu, 16 Sep 2010 17:38:06 +0530 [thread overview]
Message-ID: <20100916120806.GJ2332@in.ibm.com> (raw)
In-Reply-To: <1284631464.30449.85.camel@pasglop>
Hi Ben,
On Thu, Sep 16, 2010 at 08:04:24PM +1000, Benjamin Herrenschmidt wrote:
> 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.
>
Thanks Ben for taking a look at this. So I checked the rtas messages on
the serial console and see the following:
instantiating rtas at 0x000000000f632000... done
Which does not correspond to the higher addresses that I see as reserved
(observation on a 16G machine).
--
Regards,
Ankita Garg (ankita@in.ibm.com)
Linux Technology Center
IBM India Systems & Technology Labs,
Bangalore, India
--
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next prev parent reply other threads:[~2010-09-16 12:08 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-09-16 5:23 Reserved pages in PowerPC Ankita Garg
2010-09-16 5:23 ` Ankita Garg
2010-09-16 10:04 ` Benjamin Herrenschmidt
2010-09-16 10:04 ` Benjamin Herrenschmidt
2010-09-16 12:08 ` Ankita Garg [this message]
2010-09-16 12:08 ` Ankita Garg
2010-09-16 21:52 ` Benjamin Herrenschmidt
2010-09-16 21:52 ` Benjamin Herrenschmidt
2010-09-28 10:28 ` Ankita Garg
2010-09-28 10:28 ` Ankita Garg
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