From: Matthew Wilcox <matthew@wil.cx>
To: Christoph Lameter <cl@linux.com>
Cc: James Bottomley <James.Bottomley@HansenPartnership.com>,
Pekka Enberg <penberg@kernel.org>,
KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>,
Michal Hocko <mhocko@suse.cz>,
Andrew Morton <akpm@linux-foundation.org>,
Hugh Dickins <hughd@google.com>,
linux-mm@kvack.org, LKML <linux-kernel@vger.kernel.org>,
linux-parisc@vger.kernel.org,
David Rientjes <rientjes@google.com>, Ingo Molnar <mingo@elte.hu>,
x86 maintainers <x86@kernel.org>,
linux-arch@vger.kernel.org, Mel Gorman <mel@csn.ul.ie>
Subject: Re: [PATCH v3] mm: make expand_downwards symmetrical to expand_upwards
Date: Wed, 20 Apr 2011 13:25:41 -0600 [thread overview]
Message-ID: <20110420192540.GC31296@parisc-linux.org> (raw)
In-Reply-To: <alpine.DEB.2.00.1104201018360.9266@router.home>
On Wed, Apr 20, 2011 at 10:22:04AM -0500, Christoph Lameter wrote:
> There is barely any testing going on at all of this since we have had this
> issue for more than 5 years and have not noticed it. The absence of bug
> reports therefore proves nothing. Code inspection of the VM shows
> that this is an issue that arises in multiple subsystems and that we have
> VM_BUG_ONs in the page allocator that should trigger for these situations.
So ... we've proven that people using these architectures use SLAB
instead of SLUB, don't enable CONFIG_DEBUG_VM and don't use hugepages
(not really a surprise ... nobody's running Oracle on these arches :-)
I don't think that qualifies as "barely any testing". I think that's
"nobody developing the Linux MM uses one of these architectures".
--
Matthew Wilcox Intel Open Source Technology Centre
"Bill, look, we understand that you're interested in selling us this
operating system, but compare it to ours. We can't possibly take such
a retrograde step."
WARNING: multiple messages have this Message-ID (diff)
From: Matthew Wilcox <matthew@wil.cx>
To: Christoph Lameter <cl@linux.com>
Cc: James Bottomley <James.Bottomley@HansenPartnership.com>,
Pekka Enberg <penberg@kernel.org>,
KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>,
Michal Hocko <mhocko@suse.cz>,
Andrew Morton <akpm@linux-foundation.org>,
Hugh Dickins <hughd@google.com>,
linux-mm@kvack.org, LKML <linux-kernel@vger.kernel.org>,
linux-parisc@vger.kernel.org,
David Rientjes <rientjes@google.com>, Ingo Molnar <mingo@elte.hu>,
x86 maintainers <x86@kernel.org>,
linux-arch@vger.kernel.org, Mel Gorman <mel@csn.ul.ie>
Subject: Re: [PATCH v3] mm: make expand_downwards symmetrical to expand_upwards
Date: Wed, 20 Apr 2011 13:25:41 -0600 [thread overview]
Message-ID: <20110420192540.GC31296@parisc-linux.org> (raw)
In-Reply-To: <alpine.DEB.2.00.1104201018360.9266@router.home>
On Wed, Apr 20, 2011 at 10:22:04AM -0500, Christoph Lameter wrote:
> There is barely any testing going on at all of this since we have had this
> issue for more than 5 years and have not noticed it. The absence of bug
> reports therefore proves nothing. Code inspection of the VM shows
> that this is an issue that arises in multiple subsystems and that we have
> VM_BUG_ONs in the page allocator that should trigger for these situations.
So ... we've proven that people using these architectures use SLAB
instead of SLUB, don't enable CONFIG_DEBUG_VM and don't use hugepages
(not really a surprise ... nobody's running Oracle on these arches :-)
I don't think that qualifies as "barely any testing". I think that's
"nobody developing the Linux MM uses one of these architectures".
--
Matthew Wilcox Intel Open Source Technology Centre
"Bill, look, we understand that you're interested in selling us this
operating system, but compare it to ours. We can't possibly take such
a retrograde step."
--
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next prev parent reply other threads:[~2011-04-20 19:25 UTC|newest]
Thread overview: 208+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-04-15 13:51 [PATCH] mm: make expand_downwards symmetrical to expand_upwards Michal Hocko
2011-04-15 13:51 ` Michal Hocko
2011-04-18 3:00 ` Hugh Dickins
2011-04-18 3:00 ` Hugh Dickins
2011-04-18 10:01 ` [PATCH v2] " Michal Hocko
2011-04-18 10:01 ` Michal Hocko
2011-04-18 20:56 ` Andrew Morton
2011-04-18 20:56 ` Andrew Morton
[not found] ` <20110419091022.GA21689@tiehlicka.suse.cz>
2011-04-19 11:09 ` [PATCH followup] mm: get rid of CONFIG_STACK_GROWSUP || CONFIG_IA64 Michal Hocko
2011-04-19 11:09 ` Michal Hocko
2011-04-20 0:33 ` KOSAKI Motohiro
2011-04-20 0:33 ` KOSAKI Motohiro
2011-04-20 6:59 ` Michal Hocko
2011-04-20 6:59 ` Michal Hocko
2011-04-20 7:08 ` KOSAKI Motohiro
2011-04-20 7:08 ` KOSAKI Motohiro
2011-04-26 7:59 ` Michal Hocko
2011-04-26 7:59 ` Michal Hocko
2011-04-19 11:10 ` [PATCH v3] mm: make expand_downwards symmetrical to expand_upwards Michal Hocko
2011-04-19 11:10 ` Michal Hocko
2011-04-19 11:10 ` Michal Hocko
2011-04-19 15:46 ` James Bottomley
2011-04-19 15:46 ` James Bottomley
2011-04-19 16:06 ` [PATCH v3] mm: make expand_downwards symmetrical to John David Anglin
2011-04-19 16:06 ` John David Anglin
2011-04-19 16:59 ` James Bottomley
2011-04-19 16:59 ` James Bottomley
2011-04-19 16:07 ` [PATCH v3] mm: make expand_downwards symmetrical to expand_upwards James Bottomley
2011-04-19 16:07 ` James Bottomley
2011-04-19 17:05 ` Pekka Enberg
2011-04-19 17:05 ` Pekka Enberg
2011-04-19 17:05 ` Pekka Enberg
2011-04-19 17:11 ` James Bottomley
2011-04-19 17:11 ` James Bottomley
2011-04-19 17:15 ` Christoph Lameter
2011-04-19 17:15 ` Christoph Lameter
2011-04-19 17:48 ` James Bottomley
2011-04-19 17:48 ` James Bottomley
2011-04-19 18:10 ` Christoph Lameter
2011-04-19 18:10 ` Christoph Lameter
2011-04-19 18:20 ` James Bottomley
2011-04-19 18:20 ` James Bottomley
2011-04-19 18:35 ` Christoph Lameter
2011-04-19 18:35 ` Christoph Lameter
2011-04-19 19:49 ` James Bottomley
2011-04-19 19:49 ` James Bottomley
2011-04-19 20:56 ` Christoph Lameter
2011-04-19 20:56 ` Christoph Lameter
2011-04-19 21:21 ` James Bottomley
2011-04-19 21:21 ` James Bottomley
2011-04-19 21:39 ` Christoph Lameter
2011-04-19 21:39 ` Christoph Lameter
2011-04-19 21:48 ` James Bottomley
2011-04-19 21:48 ` James Bottomley
2011-04-19 21:58 ` Christoph Lameter
2011-04-19 21:58 ` Christoph Lameter
2011-04-20 1:23 ` KOSAKI Motohiro
2011-04-20 1:23 ` KOSAKI Motohiro
2011-04-20 2:48 ` James Bottomley
2011-04-20 2:48 ` James Bottomley
2011-04-20 2:57 ` KOSAKI Motohiro
2011-04-20 2:57 ` KOSAKI Motohiro
2011-04-20 2:57 ` KOSAKI Motohiro
2011-04-20 13:50 ` Christoph Lameter
2011-04-20 13:50 ` Christoph Lameter
2011-04-21 13:32 ` Tejun Heo
2011-04-21 13:32 ` Tejun Heo
2011-04-20 5:53 ` Pekka Enberg
2011-04-20 5:53 ` Pekka Enberg
2011-04-20 7:15 ` KOSAKI Motohiro
2011-04-20 7:15 ` KOSAKI Motohiro
2011-04-20 7:34 ` Pekka Enberg
2011-04-20 7:34 ` Pekka Enberg
2011-04-20 7:34 ` Pekka Enberg
2011-04-20 8:40 ` KOSAKI Motohiro
2011-04-20 8:40 ` KOSAKI Motohiro
2011-04-20 8:40 ` KOSAKI Motohiro
2011-04-20 16:32 ` James Bottomley
2011-04-20 16:32 ` James Bottomley
2011-04-20 16:50 ` Christoph Lameter
2011-04-20 16:50 ` Christoph Lameter
2011-04-20 18:09 ` James Bottomley
2011-04-20 18:09 ` James Bottomley
2011-04-20 21:18 ` David Rientjes
2011-04-20 21:18 ` David Rientjes
2011-04-20 22:15 ` James Bottomley
2011-04-20 22:15 ` James Bottomley
2011-04-20 23:12 ` David Rientjes
2011-04-20 23:12 ` David Rientjes
2011-04-21 13:16 ` KOSAKI Motohiro
2011-04-21 13:16 ` KOSAKI Motohiro
2011-04-21 16:37 ` James Bottomley
2011-04-21 16:37 ` James Bottomley
2011-04-21 18:33 ` Christoph Lameter
2011-04-21 18:33 ` Christoph Lameter
2011-04-21 18:45 ` Dave Hansen
2011-04-21 18:45 ` Dave Hansen
2011-04-22 18:19 ` James Bottomley
2011-04-22 18:19 ` James Bottomley
2011-04-22 20:24 ` Dave Hansen
2011-04-22 20:24 ` Dave Hansen
2011-04-22 20:35 ` James Bottomley
2011-04-22 20:35 ` James Bottomley
2011-04-22 21:33 ` James Bottomley
2011-04-22 21:33 ` James Bottomley
2011-04-23 18:34 ` [PATCH] convert parisc to sparsemem (was Re: [PATCH v3] mm: make expand_downwards symmetrical to expand_upwards) James Bottomley
2011-04-23 18:34 ` James Bottomley
2011-04-24 16:27 ` John David Anglin
2011-04-24 16:27 ` John David Anglin
2011-04-26 0:32 ` KOSAKI Motohiro
2011-04-26 0:32 ` KOSAKI Motohiro
2011-04-27 16:36 ` Dave Hansen
2011-04-27 16:36 ` Dave Hansen
2011-04-21 20:05 ` [PATCH v3] mm: make expand_downwards symmetrical to expand_upwards James Bottomley
2011-04-21 20:05 ` James Bottomley
2011-04-21 21:07 ` Christoph Lameter
2011-04-21 21:07 ` Christoph Lameter
2011-04-21 21:22 ` James Bottomley
2011-04-21 21:22 ` James Bottomley
2011-04-21 19:33 ` David Rientjes
2011-04-21 19:33 ` David Rientjes
2011-04-22 0:34 ` KOSAKI Motohiro
2011-04-22 0:34 ` KOSAKI Motohiro
2011-04-21 2:27 ` [patch] parisc: set memory ranges in N_NORMAL_MEMORY when onlined David Rientjes
2011-04-21 13:03 ` [PATCH v3] mm: make expand_downwards symmetrical to expand_upwards KOSAKI Motohiro
2011-04-21 13:03 ` KOSAKI Motohiro
2011-04-21 19:38 ` David Rientjes
2011-04-21 19:38 ` David Rientjes
2011-04-21 20:02 ` Christoph Lameter
2011-04-21 20:02 ` Christoph Lameter
2011-04-21 21:19 ` David Rientjes
2011-04-21 21:19 ` David Rientjes
2011-04-21 21:24 ` James Bottomley
2011-04-21 21:24 ` James Bottomley
2011-04-21 21:34 ` David Rientjes
2011-04-21 21:34 ` David Rientjes
2011-04-21 21:49 ` James Bottomley
2011-04-21 21:49 ` James Bottomley
2011-04-21 22:12 ` David Rientjes
2011-04-21 22:12 ` David Rientjes
2011-04-22 8:02 ` Pekka Enberg
2011-04-22 8:02 ` Pekka Enberg
2011-04-22 8:02 ` Pekka Enberg
2011-04-22 13:49 ` James Bottomley
2011-04-22 13:49 ` James Bottomley
2011-04-22 17:00 ` Pekka Enberg
2011-04-22 17:00 ` Pekka Enberg
2011-04-22 17:03 ` James Bottomley
2011-04-22 17:03 ` James Bottomley
2011-04-21 21:31 ` [patch] parisc: enable CONFIG_NUMA for DISCONTIGMEM and fix build errors David Rientjes
2011-04-21 21:41 ` [patch] mm: always set nodes with regular memory in N_NORMAL_MEMORY David Rientjes
2011-04-21 21:41 ` David Rientjes
2011-04-22 0:36 ` KOSAKI Motohiro
2011-04-22 0:36 ` KOSAKI Motohiro
2011-04-21 22:00 ` [patch] alpha, mm: set all online nodes " David Rientjes
2011-04-21 22:01 ` [patch] m32r, " David Rientjes
2011-04-21 22:02 ` [patch] m68k, " David Rientjes
2011-04-24 1:59 ` Michael Schmitz
2011-04-24 3:14 ` KOSAKI Motohiro
2011-04-24 4:01 ` Michael Schmitz
2011-04-24 5:05 ` Michael Schmitz
2011-04-24 6:04 ` KOSAKI Motohiro
2011-04-24 11:32 ` Thorsten Glaser
2011-04-25 2:41 ` Michael Schmitz
2011-04-25 14:22 ` Thorsten Glaser
2011-04-24 12:18 ` Thorsten Glaser
2011-04-25 20:56 ` David Rientjes
2011-04-26 2:51 ` Michael Schmitz
2011-04-26 10:50 ` Thorsten Glaser
2011-04-27 13:19 ` Geert Uytterhoeven
2011-04-27 15:09 ` Thorsten Glaser
2011-04-27 15:11 ` Thorsten Glaser
2011-04-28 2:35 ` Ben Hutchings
2011-04-28 3:05 ` Michael Schmitz
2011-04-20 21:05 ` [PATCH v3] mm: make expand_downwards symmetrical to expand_upwards David Rientjes
2011-04-20 21:05 ` David Rientjes
2011-04-20 11:20 ` Matthew Wilcox
2011-04-20 11:20 ` Matthew Wilcox
2011-04-20 11:28 ` Pekka Enberg
2011-04-20 11:28 ` Pekka Enberg
2011-04-20 11:28 ` Pekka Enberg
2011-04-20 14:15 ` James Bottomley
2011-04-20 14:15 ` James Bottomley
2011-04-20 14:50 ` Christoph Lameter
2011-04-20 14:50 ` Christoph Lameter
2011-04-20 15:02 ` James Bottomley
2011-04-20 15:02 ` James Bottomley
2011-04-20 15:22 ` Christoph Lameter
2011-04-20 15:22 ` Christoph Lameter
2011-04-20 19:25 ` Matthew Wilcox [this message]
2011-04-20 19:25 ` Matthew Wilcox
2011-04-20 21:42 ` David Rientjes
2011-04-20 21:42 ` David Rientjes
2011-04-21 16:06 ` James Bottomley
2011-04-21 16:06 ` James Bottomley
2011-04-21 22:19 ` David Rientjes
2011-04-21 22:19 ` David Rientjes
2011-04-21 22:31 ` James Bottomley
2011-04-21 22:31 ` James Bottomley
2011-04-20 13:58 ` Christoph Lameter
2011-04-20 13:58 ` Christoph Lameter
2011-04-20 21:34 ` David Rientjes
2011-04-20 21:34 ` David Rientjes
2011-04-20 14:07 ` Christoph Lameter
2011-04-20 14:07 ` Christoph Lameter
2011-04-20 2:33 ` James Bottomley
2011-04-20 2:33 ` James Bottomley
2011-04-19 17:12 ` Christoph Lameter
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