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From: Andi Kleen <ak@linux.intel.com>
To: Michal Hocko <mhocko@kernel.org>
Cc: "Michal Suchánek" <msuchanek@suse.de>,
	"David Hildenbrand" <david@redhat.com>,
	"Gautham R Shenoy" <ego@linux.vnet.ibm.com>,
	"Srikar Dronamraju" <srikar@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>,
	"Andrew Morton" <akpm@linux-foundation.org>,
	linuxppc-dev@lists.ozlabs.org,
	"Christopher Lameter" <cl@linux.com>,
	"Vlastimil Babka" <vbabka@suse.cz>
Subject: Re: [PATCH v5 3/3] mm/page_alloc: Keep memoryless cpuless node 0 offline
Date: Mon, 6 Jul 2020 09:08:15 -0700	[thread overview]
Message-ID: <20200706160815.GH3448022@tassilo.jf.intel.com> (raw)
In-Reply-To: <20200703092414.GR18446@dhcp22.suse.cz>

> > What's the point of this indirection other than another way of avoiding
> > empty node 0?
> 
> Honestly, I do not have any idea. I've traced it down to
> Author: Andi Kleen <ak@suse.de>
> Date:   Tue Jan 11 15:35:48 2005 -0800

I don't remember all the details, and I can't even find the commit
(is it in linux-historic?).

But AFAIK there's no guarantee PXMs are small and continuous, so it
seemed better to have a clean zero based space.

Back then we had a lot of problems with buggy SRAT tables in BIOS,
so we really tried to avoid trusting the BIOS as much as possible.

-Andi


      parent reply	other threads:[~2020-07-06 16:08 UTC|newest]

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
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 [this message]

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