Linux-mm Archive on lore.kernel.org
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From: Christopher Lameter <cl@linux.com>
To: Srikar Dronamraju <srikar@linux.vnet.ibm.com>
Cc: Andrew Morton <akpm@linux-foundation.org>,
	linuxppc-dev@lists.ozlabs.org,  linux-mm@kvack.org,
	linux-kernel@vger.kernel.org,  Michal Hocko <mhocko@suse.com>,
	Mel Gorman <mgorman@suse.de>,  Vlastimil Babka <vbabka@suse.cz>,
	 "Kirill A. Shutemov" <kirill@shutemov.name>,
	 Michael Ellerman <mpe@ellerman.id.au>,
	 Linus Torvalds <torvalds@linux-foundation.org>,
	 Gautham R Shenoy <ego@linux.vnet.ibm.com>,
	 Satheesh Rajendran <sathnaga@linux.vnet.ibm.com>,
	 David Hildenbrand <david@redhat.com>
Subject: Re: [PATCH v5 3/3] mm/page_alloc: Keep memoryless cpuless node 0 offline
Date: Mon, 29 Jun 2020 14:58:40 +0000 (UTC)
Message-ID: <alpine.DEB.2.22.394.2006291456550.27163@www.lameter.com> (raw)
In-Reply-To: <20200624092846.9194-4-srikar@linux.vnet.ibm.com>

On Wed, 24 Jun 2020, Srikar Dronamraju wrote:

> Currently Linux kernel with CONFIG_NUMA on a system with multiple
> possible nodes, marks node 0 as online at boot.  However in practice,
> there are systems which have node 0 as memoryless and cpuless.

Maybe add something to explain why you are not simply mapping the
existing memory to NUMA node 0 which is after all just a numbering scheme
used by the kernel and can be used arbitrarily?

This could be seen more as a bug in the arch code during the setup of NUMA
nodes. The two nodes are created by the firmwware / bootstrap code after
all. Just do not do it?



  reply index

Thread overview: 29+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-06-24  9:28 [PATCH v5 0/3] Offline memoryless cpuless node 0 Srikar Dronamraju
2020-06-24  9:28 ` [PATCH v5 1/3] powerpc/numa: Set numa_node for all possible cpus Srikar Dronamraju
2020-06-24  9:48   ` Gautham R Shenoy
2020-06-24  9:28 ` [PATCH v5 2/3] powerpc/numa: Prefer node id queried from vphn Srikar Dronamraju
2020-06-24 10:29   ` Gautham R Shenoy
2020-06-24  9:28 ` [PATCH v5 3/3] mm/page_alloc: Keep memoryless cpuless node 0 offline Srikar Dronamraju
2020-06-29 14:58   ` Christopher Lameter [this message]
2020-06-30  4:01     ` Srikar Dronamraju
2020-07-01 12:23       ` Michal Hocko
2020-07-01  8:42   ` Michal Hocko
2020-07-01 10:04     ` Srikar Dronamraju
2020-07-01 10:15       ` David Hildenbrand
2020-07-01 11:01         ` Srikar Dronamraju
2020-07-01 11:06           ` David Hildenbrand
2020-07-01 11:30             ` David Hildenbrand
2020-07-01 12:21               ` Michal Hocko
2020-07-02  6:44                 ` Srikar Dronamraju
2020-07-02  8:41                   ` Michal Hocko
2020-07-02 14:32                     ` Srikar Dronamraju
2020-07-03  9:10                 ` Michal Suchánek
2020-07-03  9:24                   ` Michal Hocko
2020-07-03 10:59                     ` Michal Hocko
2020-07-03 11:32                       ` David Hildenbrand
2020-07-03 11:46                         ` Michal Hocko
2020-07-03 12:58                       ` Srikar Dronamraju
2020-08-07  4:32                         ` Andrew Morton
2020-08-07  6:58                           ` David Hildenbrand
2020-08-07 10:04                             ` Michal Suchánek
2020-07-06 16:08                     ` Andi Kleen

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