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From: Andrew Morton <akpm@linux-foundation.org>
To: Srikar Dronamraju <srikar@linux.vnet.ibm.com>
Cc: Michal Hocko <mhocko@kernel.org>,
	Michal Such?nek <msuchanek@suse.de>,
	David Hildenbrand <david@redhat.com>,
	Gautham R Shenoy <ego@linux.vnet.ibm.com>,
	Linus Torvalds <torvalds@linux-foundation.org>,
	linux-kernel@vger.kernel.org, linux-mm@kvack.org,
	Satheesh Rajendran <sathnaga@linux.vnet.ibm.com>,
	Mel Gorman <mgorman@suse.de>,
	"Kirill A. Shutemov" <kirill@shutemov.name>,
	linuxppc-dev@lists.ozlabs.org, Christopher Lameter <cl@linux.com>,
	Vlastimil Babka <vbabka@suse.cz>, Andi Kleen <ak@linux.intel.com>
Subject: Re: [PATCH v5 3/3] mm/page_alloc: Keep memoryless cpuless node 0 offline
Date: Thu, 6 Aug 2020 21:32:11 -0700
Message-ID: <20200806213211.6a6a56037fe771836e5abbe9@linux-foundation.org> (raw)
In-Reply-To: <20200703125823.GA26243@linux.vnet.ibm.com>

On Fri, 3 Jul 2020 18:28:23 +0530 Srikar Dronamraju <srikar@linux.vnet.ibm.com> wrote:

> > The memory hotplug changes that somehow because you can hotremove numa
> > nodes and therefore make the nodemask sparse but that is not a common
> > case. I am not sure what would happen if a completely new node was added
> > and its corresponding node was already used by the renumbered one
> > though. It would likely conflate the two I am afraid. But I am not sure
> > this is really possible with x86 and a lack of a bug report would
> > suggest that nobody is doing that at least.
> > 
> 
> JFYI,
> Satheesh copied in this mailchain had opened a bug a year on crash with vcpu
> hotplug on memoryless node. 
> 
> https://bugzilla.kernel.org/show_bug.cgi?id=202187

So...  do we merge this patch or not?  Seems that the overall view is
"risky but nobody is likely to do anything better any time soon"?


  reply index

Thread overview: 33+ 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
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 [this message]
2020-08-07  6:58                           ` David Hildenbrand
2020-08-07 10:04                             ` Michal Suchánek
2020-08-12  6:01                           ` Srikar Dronamraju
2020-08-18  7:32                             ` David Hildenbrand
2020-08-18  7:37                               ` Michal Hocko
2020-08-18  7:49                                 ` Srikar Dronamraju
2020-07-06 16:08                     ` Andi Kleen

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