From: Dan Williams <dan.j.williams@intel.com>
To: David Hildenbrand <david@redhat.com>,
Dan Williams <dan.j.williams@intel.com>,
<linux-cxl@vger.kernel.org>
Cc: Kees Cook <keescook@chromium.org>, <stable@vger.kernel.org>,
Dave Hansen <dave.hansen@linux.intel.com>,
Michal Hocko <mhocko@suse.com>, <linux-mm@kvack.org>,
<linux-acpi@vger.kernel.org>
Subject: Re: [PATCH 00/18] CXL RAM and the 'Soft Reserved' => 'System RAM' default
Date: Tue, 14 Feb 2023 10:45:46 -0800 [thread overview]
Message-ID: <63ebd6da1c4f4_32d612948c@dwillia2-xfh.jf.intel.com.notmuch> (raw)
In-Reply-To: <ed85ee75-1507-3f72-2af7-40ba452402f4@redhat.com>
David Hildenbrand wrote:
[..]
> My concern would be that in setups with a lot of CXL memory
> (soft-reserved), having that much offline memory during boot might make
> the kernel run out of memory. After all, offline memory consumes memory
> for the memmap.
>
> Is the assumption that something like that cannot happen because we'll
> never ever have that much soft-reserved memory? :)
Right, the assumption is that platform firmware is going to pick a
reasonable general purpose pool that lets an OS boot. In the near term
it is difficult to get that wrong since it will encompass all locally
attached DDR-DRAM. In the longer term, where it becomes possible that
all memory is CXL attached, then platform firmware will need to mark
some or all of CXL memory as general purpose (not Soft Reserved).
> Note that this is a concern only applies when not using auto-onlining in
> the kernel during boot, which (IMHO) is or will be the default in the
> future.
Yes, I expect that to be the default as well and let those small few
that have custom requirements figure out how to override that default.
next prev parent reply other threads:[~2023-02-14 18:46 UTC|newest]
Thread overview: 111+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-02-06 1:02 [PATCH 00/18] CXL RAM and the 'Soft Reserved' => 'System RAM' default Dan Williams
2023-02-06 1:02 ` [PATCH 01/18] cxl/Documentation: Update references to attributes added in v6.0 Dan Williams
2023-02-06 15:17 ` Jonathan Cameron
2023-02-06 16:37 ` Gregory Price
2023-02-06 17:27 ` [PATCH 1/18] " Davidlohr Bueso
2023-02-06 19:15 ` [PATCH 01/18] " Ira Weiny
2023-02-06 21:04 ` Dave Jiang
2023-02-09 0:20 ` Verma, Vishal L
2023-02-06 1:02 ` [PATCH 02/18] cxl/region: Add a mode attribute for regions Dan Williams
2023-02-06 15:46 ` Jonathan Cameron
2023-02-06 17:47 ` Dan Williams
2023-02-06 16:39 ` Gregory Price
2023-02-06 19:16 ` Ira Weiny
2023-02-06 21:05 ` Dave Jiang
2023-02-09 0:22 ` Verma, Vishal L
2023-02-06 1:02 ` [PATCH 03/18] cxl/region: Support empty uuids for non-pmem regions Dan Williams
2023-02-06 15:54 ` Jonathan Cameron
2023-02-06 18:07 ` Dan Williams
2023-02-06 19:22 ` Ira Weiny
2023-02-06 19:35 ` Dan Williams
2023-02-09 0:24 ` Verma, Vishal L
2023-02-06 1:02 ` [PATCH 04/18] cxl/region: Validate region mode vs decoder mode Dan Williams
2023-02-06 16:02 ` Jonathan Cameron
2023-02-06 18:14 ` Dan Williams
2023-02-06 16:44 ` Gregory Price
2023-02-06 21:51 ` Dan Williams
2023-02-06 19:55 ` Gregory Price
2023-02-06 19:23 ` Ira Weiny
2023-02-06 22:16 ` Dave Jiang
2023-02-09 0:25 ` Verma, Vishal L
2023-02-06 1:02 ` [PATCH 05/18] cxl/region: Add volatile region creation support Dan Williams
2023-02-06 16:18 ` Jonathan Cameron
2023-02-06 18:19 ` Dan Williams
2023-02-06 16:55 ` Gregory Price
2023-02-06 21:57 ` Dan Williams
2023-02-06 19:56 ` Gregory Price
2023-02-06 19:25 ` Ira Weiny
2023-02-06 22:31 ` Dave Jiang
2023-02-06 22:37 ` Dan Williams
2023-02-09 1:02 ` Verma, Vishal L
2023-02-06 1:03 ` [PATCH 06/18] cxl/region: Refactor attach_target() for autodiscovery Dan Williams
2023-02-06 17:06 ` Jonathan Cameron
2023-02-06 18:48 ` Dan Williams
2023-02-06 19:26 ` Ira Weiny
2023-02-06 22:41 ` Dave Jiang
2023-02-09 1:09 ` Verma, Vishal L
2023-02-06 1:03 ` [PATCH 07/18] cxl/region: Move region-position validation to a helper Dan Williams
2023-02-06 17:44 ` Ira Weiny
2023-02-06 19:15 ` Dan Williams
2023-02-08 12:30 ` Jonathan Cameron
2023-02-09 4:09 ` Dan Williams
2023-02-09 4:26 ` Dan Williams
2023-02-09 11:07 ` Jonathan Cameron
2023-02-09 20:52 ` Dan Williams
2023-02-09 19:45 ` Verma, Vishal L
2023-02-06 1:03 ` [PATCH 08/18] kernel/range: Uplevel the cxl subsystem's range_contains() helper Dan Williams
2023-02-06 17:02 ` Gregory Price
2023-02-06 22:01 ` Dan Williams
2023-02-06 19:28 ` Ira Weiny
2023-02-06 23:41 ` Dave Jiang
2023-02-08 12:32 ` Jonathan Cameron
2023-02-09 19:47 ` Verma, Vishal L
2023-02-06 1:03 ` [PATCH 09/18] cxl/region: Enable CONFIG_CXL_REGION to be toggled Dan Williams
2023-02-06 17:03 ` Gregory Price
2023-02-06 23:57 ` Dave Jiang
2023-02-08 12:36 ` Jonathan Cameron
2023-02-09 20:17 ` Verma, Vishal L
2023-02-06 1:03 ` [PATCH 10/18] cxl/region: Fix passthrough-decoder detection Dan Williams
2023-02-06 5:38 ` Greg KH
2023-02-06 17:22 ` Dan Williams
2023-02-07 0:00 ` Dave Jiang
2023-02-08 12:44 ` Jonathan Cameron
2023-02-09 20:28 ` Verma, Vishal L
2023-02-06 1:03 ` [PATCH 11/18] cxl/region: Add region autodiscovery Dan Williams
2023-02-06 19:02 ` Ira Weiny
2023-02-07 23:54 ` Dave Jiang
2023-02-08 17:07 ` Jonathan Cameron
2023-02-09 4:07 ` Dan Williams
2023-02-06 1:03 ` [PATCH 12/18] tools/testing/cxl: Define a fixed volatile configuration to parse Dan Williams
2023-02-08 17:31 ` Jonathan Cameron
2023-02-09 20:50 ` Dan Williams
2023-02-06 1:03 ` [PATCH 13/18] dax/hmem: Move HMAT and Soft reservation probe initcall level Dan Williams
2023-02-06 1:03 ` [PATCH 14/18] dax/hmem: Drop unnecessary dax_hmem_remove() Dan Williams
2023-02-06 17:15 ` Gregory Price
2023-02-08 17:33 ` Jonathan Cameron
2023-02-06 1:03 ` [PATCH 15/18] dax/hmem: Convey the dax range via memregion_info() Dan Williams
2023-02-08 17:35 ` Jonathan Cameron
2023-02-06 1:03 ` [PATCH 16/18] dax/hmem: Move hmem device registration to dax_hmem.ko Dan Williams
2023-02-06 1:04 ` [PATCH 17/18] dax: Assign RAM regions to memory-hotplug by default Dan Williams
2023-02-06 17:26 ` Gregory Price
2023-02-06 22:15 ` Dan Williams
2023-02-06 19:05 ` Gregory Price
2023-02-06 23:20 ` Dan Williams
2023-02-06 1:04 ` [PATCH 18/18] cxl/dax: Create dax devices for CXL RAM regions Dan Williams
2023-02-06 5:36 ` [PATCH 00/18] CXL RAM and the 'Soft Reserved' => 'System RAM' default Gregory Price
2023-02-06 16:40 ` Davidlohr Bueso
2023-02-06 18:23 ` Dan Williams
2023-02-06 17:29 ` Dan Williams
2023-02-06 17:18 ` Davidlohr Bueso
[not found] ` <CGME20230208173730uscas1p2af3a9eeb8946dfa607b190c079a49653@uscas1p2.samsung.com>
2023-02-08 17:37 ` Fan Ni
2023-02-09 4:56 ` Dan Williams
2023-02-13 12:13 ` David Hildenbrand
2023-02-14 18:45 ` Dan Williams [this message]
2023-02-14 18:27 ` Gregory Price
2023-02-14 18:39 ` Dan Williams
2023-02-14 19:01 ` Gregory Price
2023-02-14 21:18 ` Jonathan Cameron
2023-02-14 21:51 ` Gregory Price
2023-02-14 21:54 ` Gregory Price
2023-02-15 10:03 ` Jonathan Cameron
2023-02-18 9:47 ` Gregory Price
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