From: Geoff Levand <geoff@infradead.org>
To: Hector Martin <hector@marcansoft.com>
Cc: cbe-oss-dev@lists.ozlabs.org, Andre Heider <a.heider@gmail.com>,
linuxppc-dev@lists.ozlabs.org
Subject: Re: [PATCH 03/15] [PS3] Add region 1 memory early
Date: Thu, 4 Aug 2011 08:57:56 -0700 [thread overview]
Message-ID: <4E3AC184.3010001@infradead.org> (raw)
In-Reply-To: <4E39E302.9060702@marcansoft.com>
Hi Hector,
On 08/03/2011 05:08 PM, Hector Martin wrote:
> On 08/04/2011 12:32 AM, Geoff Levand wrote:
>> We need an explanation of this change.
Sorry for such a terse request. What I meant was that
this is a significant change to how high mem is managed,
so the patch needs a comment explaining the change.
> I actually have a hard time understanding the reason for the existing
> behavior of hot-adding memory halfway through the boot process. Maybe
> you can shed some light on this?
LV1 was intended to be a generic hypervisor for the Cell
processor. It was imagined that it could be used on machines
which could be running many lpars. Around the same time I
was doing the high mem support the hot plug memory support was
being developed. I thought at some point there would be
hot-unplug, which could be used to move memory between lpars.
At the present time this change make sense, since it is simpler
and more flexible.
-Geoff
next prev parent reply other threads:[~2011-08-04 15:57 UTC|newest]
Thread overview: 70+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-08-01 20:02 [PATCH 00/15] ps3: Support more than the OtherOS lpar Andre Heider
2011-08-01 20:02 ` [PATCH 01/15] [PS3] Add udbg driver using the PS3 gelic Ethernet device Andre Heider
2011-08-03 22:32 ` Geoff Levand
2011-08-04 16:35 ` Andre Heider
2011-08-11 12:13 ` [Cbe-oss-dev] " Arnd Bergmann
2011-08-11 17:32 ` Andre Heider
2011-08-31 4:26 ` Benjamin Herrenschmidt
2011-08-01 20:02 ` [PATCH 02/15] [PS3] Get lv1 high memory region from devtree Andre Heider
2011-08-03 22:30 ` Geoff Levand
2011-08-04 1:19 ` Hector Martin
2011-08-04 19:24 ` Geoff Levand
2011-08-06 11:50 ` Andre Heider
2011-08-01 20:02 ` [PATCH 03/15] [PS3] Add region 1 memory early Andre Heider
2011-08-03 22:32 ` Geoff Levand
2011-08-04 0:08 ` Hector Martin
2011-08-04 7:05 ` Geert Uytterhoeven
2011-08-04 11:13 ` Hector Martin
2011-08-04 15:57 ` Geoff Levand [this message]
2011-08-01 20:02 ` [PATCH 04/15] ps3: MEMORY_HOTPLUG is not a requirement anymore Andre Heider
2011-08-01 20:02 ` [PATCH 05/15] ps3: Detect the current lpar environment Andre Heider
2011-08-03 22:31 ` Geoff Levand
2011-08-04 16:34 ` Andre Heider
2011-08-01 20:02 ` [PATCH 06/15] ps3flash: Fix region align checks Andre Heider
2011-08-01 20:29 ` [Cbe-oss-dev] " Geert Uytterhoeven
2011-08-01 20:56 ` Andre Heider
2011-08-01 21:00 ` Geert Uytterhoeven
2011-08-01 20:02 ` [PATCH 07/15] ps3flash: Refuse to work in lpars other than OtherOS Andre Heider
2011-08-03 22:34 ` Geoff Levand
2011-08-04 16:40 ` Andre Heider
2011-08-04 19:27 ` [Cbe-oss-dev] " Geert Uytterhoeven
2011-08-06 12:40 ` Andre Heider
2011-08-01 20:02 ` [PATCH 08/15] ps3: Only prealloc the flash bounce buffer for the OtherOS lpar Andre Heider
2011-08-01 20:03 ` [PATCH 09/15] ps3: Limit the number of regions per storage device Andre Heider
2011-08-01 20:30 ` [Cbe-oss-dev] " Geert Uytterhoeven
2011-08-01 20:58 ` Andre Heider
2011-08-06 12:28 ` Andre Heider
2011-08-06 12:47 ` Andre Heider
2011-08-01 20:03 ` [PATCH 10/15] ps3stor_lib: Add support for multiple regions Andre Heider
2011-08-01 20:35 ` Geert Uytterhoeven
2011-08-01 21:01 ` Andre Heider
2011-08-01 20:03 ` [PATCH 11/15] ps3disk: Provide a gendisk per accessible region Andre Heider
2011-08-01 20:03 ` [PATCH 12/15] ps3stor_lib: Add support for storage access flags Andre Heider
2011-08-01 20:03 ` [PATCH 13/15] ps3disk: Use region flags Andre Heider
2011-08-01 20:03 ` [PATCH 14/15] ps3: Add a vflash driver for lpars other than OtherOS Andre Heider
2011-08-01 20:03 ` [PATCH 15/15] ps3: Add a NOR FLASH driver for PS3s without NAND Andre Heider
2011-08-03 22:23 ` [PATCH 00/15] ps3: Support more than the OtherOS lpar Geoff Levand
2011-08-04 16:31 ` Andre Heider
2011-08-11 12:17 ` [Cbe-oss-dev] " Arnd Bergmann
2011-08-11 17:34 ` Andre Heider
2011-08-11 19:31 ` [PATCH part1 v2 0/9] ps3: General improvements and preparation for support " Andre Heider
2011-08-11 19:31 ` [PATCH part1 v2 1/9] Add udbg driver using the PS3 gelic Ethernet device Andre Heider
2011-08-23 20:53 ` Geoff Levand
2011-08-31 16:32 ` [PATCH] [ps3] Add gelic udbg driver Geoff Levand
2011-08-11 19:31 ` [PATCH part1 v2 2/9] ps3: Add helper functions to read highmem info from the repository Andre Heider
2011-08-23 20:53 ` Geoff Levand
2011-08-11 19:31 ` [PATCH part1 v2 3/9] ps3: Get lv1 high memory region " Andre Heider
2011-08-23 20:53 ` Geoff Levand
2011-08-11 19:31 ` [PATCH part1 v2 4/9] Add region 1 memory early Andre Heider
2011-08-23 20:53 ` Geoff Levand
2011-08-23 22:37 ` [Cbe-oss-dev] " Antonio Ospite
2011-08-24 2:15 ` Geoff Levand
2011-08-11 19:31 ` [PATCH part1 v2 5/9] ps3: MEMORY_HOTPLUG is not a requirement anymore Andre Heider
2011-08-23 20:53 ` Geoff Levand
2011-08-11 19:31 ` [PATCH part1 v2 6/9] ps3: Detect the current lpar Andre Heider
2011-08-23 22:08 ` Geoff Levand
2011-08-11 19:31 ` [PATCH part1 v2 7/9] ps3: Log the detected lpar on startup Andre Heider
2011-08-11 19:31 ` [PATCH part1 v2 8/9] ps3flash: Refuse to work in lpars other than OtherOS Andre Heider
2011-08-23 22:12 ` Geoff Levand
2011-08-11 19:31 ` [PATCH part1 v2 9/9] ps3: Only prealloc the flash bounce buffer for the OtherOS lpar Andre Heider
2011-08-31 4:29 ` [PATCH part1 v2 0/9] ps3: General improvements and preparation for support more than " Benjamin Herrenschmidt
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