From: Dave Hansen <dave.hansen@intel.com>
To: Greg KH <gregkh@linuxfoundation.org>,
Jiang Liu <jiang.liu@linux.intel.com>
Cc: Peter Zijlstra <peterz@infradead.org>,
Andrew Morton <akpm@linux-foundation.org>,
Mel Gorman <mgorman@suse.de>,
David Rientjes <rientjes@google.com>,
Mike Galbraith <umgwanakikbuti@gmail.com>,
"Rafael J . Wysocki" <rafael.j.wysocki@intel.com>,
Tony Luck <tony.luck@intel.com>,
linux-mm@kvack.org, linux-hotplug@vger.kernel.org,
linux-kernel@vger.kernel.org
Subject: Re: [RFC Patch V1 00/30] Enable memoryless node on x86 platforms
Date: Fri, 11 Jul 2014 20:02:14 +0000 [thread overview]
Message-ID: <53C042C6.2020507@intel.com> (raw)
In-Reply-To: <20140711153314.GA6155@kroah.com>
On 07/11/2014 08:33 AM, Greg KH wrote:
> On Fri, Jul 11, 2014 at 10:29:56AM +0200, Peter Zijlstra wrote:
>> > On Fri, Jul 11, 2014 at 03:37:17PM +0800, Jiang Liu wrote:
>>> > > Any comments are welcomed!
>> >
>> > Why would anybody _ever_ have a memoryless node? That's ridiculous.
> I'm with Peter here, why would this be a situation that we should even
> support? Are there machines out there shipping like this?
This is orthogonal to the problem Jiang Liu is solving, but...
The IBM guys have been hitting the CPU-less and memoryless node issues
forever, but that's mostly because their (traditional) hypervisor had
good NUMA support and ran multi-node guests.
I've never seen it in practice on x86 mostly because the hypervisors
don't have good NUMA support. I honestly think this is something x86 is
going to have to handle eventually anyway. It's essentially a resource
fragmentation problem, and there are going to be times where a guest
needs to be spun up and hypervisor has nodes with either no spare memory
or no spare CPUs.
The hypervisor has 3 choices in this case:
1. Lie about the NUMA layout
2. Waste the resources
3. Tell the guest how it's actually arranged
WARNING: multiple messages have this Message-ID (diff)
From: Dave Hansen <dave.hansen@intel.com>
To: Greg KH <gregkh@linuxfoundation.org>,
Jiang Liu <jiang.liu@linux.intel.com>
Cc: Peter Zijlstra <peterz@infradead.org>,
Andrew Morton <akpm@linux-foundation.org>,
Mel Gorman <mgorman@suse.de>,
David Rientjes <rientjes@google.com>,
Mike Galbraith <umgwanakikbuti@gmail.com>,
"Rafael J . Wysocki" <rafael.j.wysocki@intel.com>,
Tony Luck <tony.luck@intel.com>,
linux-mm@kvack.org, linux-hotplug@vger.kernel.org,
linux-kernel@vger.kernel.org
Subject: Re: [RFC Patch V1 00/30] Enable memoryless node on x86 platforms
Date: Fri, 11 Jul 2014 13:02:14 -0700 [thread overview]
Message-ID: <53C042C6.2020507@intel.com> (raw)
In-Reply-To: <20140711153314.GA6155@kroah.com>
On 07/11/2014 08:33 AM, Greg KH wrote:
> On Fri, Jul 11, 2014 at 10:29:56AM +0200, Peter Zijlstra wrote:
>> > On Fri, Jul 11, 2014 at 03:37:17PM +0800, Jiang Liu wrote:
>>> > > Any comments are welcomed!
>> >
>> > Why would anybody _ever_ have a memoryless node? That's ridiculous.
> I'm with Peter here, why would this be a situation that we should even
> support? Are there machines out there shipping like this?
This is orthogonal to the problem Jiang Liu is solving, but...
The IBM guys have been hitting the CPU-less and memoryless node issues
forever, but that's mostly because their (traditional) hypervisor had
good NUMA support and ran multi-node guests.
I've never seen it in practice on x86 mostly because the hypervisors
don't have good NUMA support. I honestly think this is something x86 is
going to have to handle eventually anyway. It's essentially a resource
fragmentation problem, and there are going to be times where a guest
needs to be spun up and hypervisor has nodes with either no spare memory
or no spare CPUs.
The hypervisor has 3 choices in this case:
1. Lie about the NUMA layout
2. Waste the resources
3. Tell the guest how it's actually arranged
--
To unsubscribe, send a message with 'unsubscribe linux-mm' in
the body to majordomo@kvack.org. For more info on Linux MM,
see: http://www.linux-mm.org/ .
Don't email: <a href=mailto:"dont@kvack.org"> email@kvack.org </a>
WARNING: multiple messages have this Message-ID (diff)
From: Dave Hansen <dave.hansen@intel.com>
To: Greg KH <gregkh@linuxfoundation.org>,
Jiang Liu <jiang.liu@linux.intel.com>
Cc: Peter Zijlstra <peterz@infradead.org>,
Andrew Morton <akpm@linux-foundation.org>,
Mel Gorman <mgorman@suse.de>,
David Rientjes <rientjes@google.com>,
Mike Galbraith <umgwanakikbuti@gmail.com>,
"Rafael J . Wysocki" <rafael.j.wysocki@intel.com>,
Tony Luck <tony.luck@intel.com>,
linux-mm@kvack.org, linux-hotplug@vger.kernel.org,
linux-kernel@vger.kernel.org
Subject: Re: [RFC Patch V1 00/30] Enable memoryless node on x86 platforms
Date: Fri, 11 Jul 2014 13:02:14 -0700 [thread overview]
Message-ID: <53C042C6.2020507@intel.com> (raw)
In-Reply-To: <20140711153314.GA6155@kroah.com>
On 07/11/2014 08:33 AM, Greg KH wrote:
> On Fri, Jul 11, 2014 at 10:29:56AM +0200, Peter Zijlstra wrote:
>> > On Fri, Jul 11, 2014 at 03:37:17PM +0800, Jiang Liu wrote:
>>> > > Any comments are welcomed!
>> >
>> > Why would anybody _ever_ have a memoryless node? That's ridiculous.
> I'm with Peter here, why would this be a situation that we should even
> support? Are there machines out there shipping like this?
This is orthogonal to the problem Jiang Liu is solving, but...
The IBM guys have been hitting the CPU-less and memoryless node issues
forever, but that's mostly because their (traditional) hypervisor had
good NUMA support and ran multi-node guests.
I've never seen it in practice on x86 mostly because the hypervisors
don't have good NUMA support. I honestly think this is something x86 is
going to have to handle eventually anyway. It's essentially a resource
fragmentation problem, and there are going to be times where a guest
needs to be spun up and hypervisor has nodes with either no spare memory
or no spare CPUs.
The hypervisor has 3 choices in this case:
1. Lie about the NUMA layout
2. Waste the resources
3. Tell the guest how it's actually arranged
next prev parent reply other threads:[~2014-07-11 20:02 UTC|newest]
Thread overview: 274+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-07-11 7:37 [RFC Patch V1 00/30] Enable memoryless node on x86 platforms Jiang Liu
2014-07-11 7:37 ` Jiang Liu
2014-07-11 7:37 ` Jiang Liu
2014-07-11 7:37 ` [RFC Patch V1 01/30] mm, kernel: Use cpu_to_mem()/numa_mem_id() to support memoryless node Jiang Liu
2014-07-11 7:37 ` Jiang Liu
2014-07-11 7:37 ` Jiang Liu
2014-07-11 15:14 ` Paul E. McKenney
2014-07-11 15:14 ` Paul E. McKenney
2014-07-11 15:14 ` Paul E. McKenney
2014-07-21 17:15 ` Nishanth Aravamudan
2014-07-21 17:15 ` Nishanth Aravamudan
2014-07-21 17:15 ` Nishanth Aravamudan
2014-07-21 17:33 ` Paul E. McKenney
2014-07-21 17:33 ` Paul E. McKenney
2014-07-21 17:33 ` Paul E. McKenney
2014-07-12 12:32 ` Jens Axboe
2014-07-12 12:32 ` Jens Axboe
2014-07-12 12:32 ` Jens Axboe
2014-07-11 7:37 ` [RFC Patch V1 02/30] mm, sched: " Jiang Liu
2014-07-11 7:37 ` Jiang Liu
2014-07-11 7:37 ` Jiang Liu
2014-07-11 7:37 ` [RFC Patch V1 03/30] mm, net: " Jiang Liu
2014-07-11 7:37 ` Jiang Liu
2014-07-11 7:37 ` Jiang Liu
2014-07-11 7:37 ` [RFC Patch V1 04/30] mm, netfilter: " Jiang Liu
2014-07-11 7:37 ` Jiang Liu
2014-07-11 7:37 ` Jiang Liu
2014-07-11 7:37 ` [RFC Patch V1 05/30] mm, perf: " Jiang Liu
2014-07-11 7:37 ` Jiang Liu
2014-07-11 7:37 ` Jiang Liu
2014-07-11 7:37 ` [RFC Patch V1 06/30] mm, tracing: " Jiang Liu
2014-07-11 7:37 ` Jiang Liu
2014-07-11 7:37 ` Jiang Liu
2014-07-11 7:37 ` [RFC Patch V1 07/30] mm: " Jiang Liu
2014-07-11 7:37 ` Jiang Liu
2014-07-11 7:37 ` Jiang Liu
2014-07-11 13:51 ` Christoph Lameter
2014-07-11 13:51 ` Christoph Lameter
2014-07-11 13:51 ` Christoph Lameter
2014-07-11 14:42 ` Tejun Heo
2014-07-11 14:42 ` Tejun Heo
2014-07-11 14:42 ` Tejun Heo
2014-07-11 15:13 ` Christoph Lameter
2014-07-11 15:13 ` Christoph Lameter
2014-07-11 15:13 ` Christoph Lameter
2014-07-11 15:21 ` Tejun Heo
2014-07-11 15:21 ` Tejun Heo
2014-07-11 15:21 ` Tejun Heo
2014-07-11 15:33 ` Tejun Heo
2014-07-11 15:33 ` Tejun Heo
2014-07-11 15:33 ` Tejun Heo
2014-07-11 15:55 ` Christoph Lameter
2014-07-11 15:55 ` Christoph Lameter
2014-07-11 15:55 ` Christoph Lameter
2014-07-11 15:58 ` Tejun Heo
2014-07-11 15:58 ` Tejun Heo
2014-07-11 15:58 ` Tejun Heo
2014-07-11 16:04 ` Christoph Lameter
2014-07-11 16:04 ` Christoph Lameter
2014-07-11 16:04 ` Christoph Lameter
2014-07-11 15:58 ` Christoph Lameter
2014-07-11 15:58 ` Christoph Lameter
2014-07-11 15:58 ` Christoph Lameter
2014-07-11 16:01 ` Tejun Heo
2014-07-11 16:01 ` Tejun Heo
2014-07-11 16:01 ` Tejun Heo
2014-07-11 16:19 ` Christoph Lameter
2014-07-11 16:19 ` Christoph Lameter
2014-07-11 16:19 ` Christoph Lameter
2014-07-11 16:24 ` Tejun Heo
2014-07-11 16:24 ` Tejun Heo
2014-07-11 16:24 ` Tejun Heo
2014-07-11 17:29 ` Christoph Lameter
2014-07-11 17:29 ` Christoph Lameter
2014-07-11 17:29 ` Christoph Lameter
2014-07-11 18:28 ` Tejun Heo
2014-07-11 18:28 ` Tejun Heo
2014-07-11 18:28 ` Tejun Heo
2014-07-11 19:11 ` Christoph Lameter
2014-07-11 19:11 ` Christoph Lameter
2014-07-11 19:11 ` Christoph Lameter
2014-07-23 3:16 ` Jiang Liu
2014-07-23 3:16 ` Jiang Liu
2014-07-23 3:16 ` Jiang Liu
2014-07-11 7:37 ` [RFC Patch V1 08/30] mm, thp: " Jiang Liu
2014-07-11 7:37 ` Jiang Liu
2014-07-11 7:37 ` Jiang Liu
2014-07-11 7:37 ` [RFC Patch V1 09/30] mm, memcg: " Jiang Liu
2014-07-11 7:37 ` Jiang Liu
2014-07-11 7:37 ` Jiang Liu
2014-07-18 7:36 ` Michal Hocko
2014-07-18 7:36 ` Michal Hocko
2014-07-18 7:36 ` Michal Hocko
2014-07-23 3:18 ` Jiang Liu
2014-07-23 3:18 ` Jiang Liu
2014-07-23 3:18 ` Jiang Liu
2014-07-11 7:37 ` [RFC Patch V1 10/30] mm, xfrm: " Jiang Liu
2014-07-11 7:37 ` Jiang Liu
2014-07-11 7:37 ` Jiang Liu
2014-07-11 7:37 ` [RFC Patch V1 11/30] mm, char/mspec.c: " Jiang Liu
2014-07-11 7:37 ` Jiang Liu
2014-07-11 7:37 ` Jiang Liu
2014-07-11 7:37 ` [RFC Patch V1 12/30] mm, IB/qib: " Jiang Liu
2014-07-11 7:37 ` Jiang Liu
2014-07-11 7:37 ` Jiang Liu
2014-07-11 7:37 ` [RFC Patch V1 13/30] mm, i40e: " Jiang Liu
2014-07-11 7:37 ` Jiang Liu
2014-07-11 7:37 ` Jiang Liu
2014-07-11 7:37 ` [RFC Patch V1 14/30] mm, i40evf: " Jiang Liu
2014-07-11 7:37 ` Jiang Liu
2014-07-11 7:37 ` Jiang Liu
2014-07-11 7:37 ` [RFC Patch V1 15/30] mm, igb: " Jiang Liu
2014-07-11 7:37 ` Jiang Liu
2014-07-11 7:37 ` Jiang Liu
2014-07-21 17:42 ` Nishanth Aravamudan
2014-07-21 17:42 ` Nishanth Aravamudan
2014-07-21 17:42 ` Nishanth Aravamudan
2014-07-21 17:42 ` Nishanth Aravamudan
2014-07-21 19:53 ` Alexander Duyck
2014-07-21 19:53 ` Alexander Duyck
2014-07-21 21:09 ` Nishanth Aravamudan
2014-07-21 21:09 ` Nishanth Aravamudan
2014-07-21 21:09 ` Nishanth Aravamudan
2014-07-21 21:09 ` Nishanth Aravamudan
2014-07-23 3:20 ` Jiang Liu
2014-07-23 3:20 ` Jiang Liu
2014-07-23 3:20 ` Jiang Liu
2014-07-11 7:37 ` [RFC Patch V1 16/30] mm, ixgbe: " Jiang Liu
2014-07-11 7:37 ` Jiang Liu
2014-07-11 7:37 ` Jiang Liu
2014-07-11 7:37 ` [RFC Patch V1 17/30] mm, intel_powerclamp: " Jiang Liu
2014-07-11 7:37 ` Jiang Liu
2014-07-11 7:37 ` Jiang Liu
2014-07-21 17:38 ` [RFC Patch V1 17/30] mm, intel_powerclamp: Use cpu_to_mem()/numa_mem_id() to support memoryless Nishanth Aravamudan
2014-07-21 17:38 ` [RFC Patch V1 17/30] mm, intel_powerclamp: Use cpu_to_mem()/numa_mem_id() to support memoryless node Nishanth Aravamudan
2014-07-21 17:38 ` Nishanth Aravamudan
2014-07-11 7:37 ` [RFC Patch V1 18/30] mm, bnx2fc: " Jiang Liu
2014-07-11 7:37 ` Jiang Liu
2014-07-11 7:37 ` Jiang Liu
2014-07-11 7:37 ` [RFC Patch V1 19/30] mm, bnx2i: " Jiang Liu
2014-07-11 7:37 ` Jiang Liu
2014-07-11 7:37 ` Jiang Liu
2014-07-11 7:37 ` [RFC Patch V1 20/30] mm, fcoe: " Jiang Liu
2014-07-11 7:37 ` Jiang Liu
2014-07-11 7:37 ` Jiang Liu
2014-07-11 7:37 ` [RFC Patch V1 21/30] mm, irqchip: " Jiang Liu
2014-07-11 7:37 ` Jiang Liu
2014-07-11 7:37 ` Jiang Liu
2014-07-11 7:37 ` Jiang Liu
2014-07-18 12:40 ` Jason Cooper
2014-07-18 12:40 ` Jason Cooper
2014-07-18 12:40 ` Jason Cooper
2014-07-18 12:40 ` Jason Cooper
2014-07-23 3:47 ` Jiang Liu
2014-07-23 3:47 ` Jiang Liu
2014-07-23 3:47 ` Jiang Liu
2014-07-23 3:47 ` Jiang Liu
2014-07-11 7:37 ` [RFC Patch V1 22/30] mm, of: " Jiang Liu
2014-07-11 7:37 ` Jiang Liu
2014-07-11 7:37 ` Jiang Liu
2014-07-21 17:52 ` Nishanth Aravamudan
2014-07-21 17:52 ` Nishanth Aravamudan
2014-07-21 17:52 ` Nishanth Aravamudan
2014-07-28 13:30 ` Grant Likely
2014-07-28 13:30 ` Grant Likely
2014-07-28 13:30 ` Grant Likely
2014-07-28 19:26 ` Nishanth Aravamudan
2014-07-28 19:26 ` Nishanth Aravamudan
2014-07-28 19:26 ` Nishanth Aravamudan
2014-07-11 7:37 ` [RFC Patch V1 23/30] mm, x86: " Jiang Liu
2014-07-11 7:37 ` Jiang Liu
2014-07-11 7:37 ` Jiang Liu
2014-07-11 7:37 ` [RFC Patch V1 24/30] mm, x86/platform/uv: " Jiang Liu
2014-07-11 7:37 ` Jiang Liu
2014-07-11 7:37 ` Jiang Liu
2014-07-11 7:37 ` [RFC Patch V1 25/30] mm, x86, kvm: " Jiang Liu
2014-07-11 7:37 ` Jiang Liu
2014-07-11 7:37 ` Jiang Liu
2014-07-11 7:44 ` Paolo Bonzini
2014-07-11 7:44 ` Paolo Bonzini
2014-07-11 7:44 ` Paolo Bonzini
2014-07-11 7:37 ` [RFC Patch V1 26/30] mm, x86, perf: " Jiang Liu
2014-07-11 7:37 ` Jiang Liu
2014-07-11 7:37 ` Jiang Liu
2014-07-11 7:37 ` [RFC Patch V1 27/30] x86, numa: Kill useless code to improve code readability Jiang Liu
2014-07-11 7:37 ` Jiang Liu
2014-07-11 7:37 ` Jiang Liu
2014-07-11 7:37 ` [RFC Patch V1 28/30] mm: Update _mem_id_[] for every possible CPU when memory configuration changes Jiang Liu
2014-07-11 7:37 ` Jiang Liu
2014-07-11 7:37 ` Jiang Liu
2014-07-21 17:47 ` [RFC Patch V1 28/30] mm: Update _mem_id_[] for every possible CPU when memory configuration chan Nishanth Aravamudan
2014-07-21 17:47 ` [RFC Patch V1 28/30] mm: Update _mem_id_[] for every possible CPU when memory configuration changes Nishanth Aravamudan
2014-07-21 17:47 ` Nishanth Aravamudan
2014-07-23 8:16 ` [RFC Patch V1 28/30] mm: Update _mem_id_[] for every possible CPU when memory configuration chan Jiang Liu
2014-07-23 8:16 ` [RFC Patch V1 28/30] mm: Update _mem_id_[] for every possible CPU when memory configuration changes Jiang Liu
2014-07-23 8:16 ` Jiang Liu
2014-07-11 7:37 ` [RFC Patch V1 29/30] mm, x86: Enable memoryless node support to better support CPU/memory hotplug Jiang Liu
2014-07-11 7:37 ` Jiang Liu
2014-07-11 7:37 ` Jiang Liu
2014-07-24 23:26 ` [RFC Patch V1 29/30] mm, x86: Enable memoryless node support to better support CPU/memory hotplu Nishanth Aravamudan
2014-07-24 23:26 ` [RFC Patch V1 29/30] mm, x86: Enable memoryless node support to better support CPU/memory hotplug Nishanth Aravamudan
2014-07-24 23:26 ` Nishanth Aravamudan
2014-07-24 23:26 ` Nishanth Aravamudan
2014-07-25 1:41 ` [RFC Patch V1 29/30] mm, x86: Enable memoryless node support to better support CPU/memory hotplu Jiang Liu
2014-07-25 1:41 ` [RFC Patch V1 29/30] mm, x86: Enable memoryless node support to better support CPU/memory hotplug Jiang Liu
2014-07-25 1:41 ` Jiang Liu
2014-07-25 1:41 ` Jiang Liu
2014-07-11 7:37 ` [RFC Patch V1 30/30] x86, NUMA: Online node earlier when doing CPU hot-addition Jiang Liu
2014-07-11 7:37 ` Jiang Liu
2014-07-11 7:37 ` Jiang Liu
2014-07-24 23:30 ` Nishanth Aravamudan
2014-07-24 23:30 ` Nishanth Aravamudan
2014-07-24 23:30 ` Nishanth Aravamudan
2014-07-25 1:43 ` Jiang Liu
2014-07-25 1:43 ` Jiang Liu
2014-07-25 1:43 ` Jiang Liu
2014-07-25 1:44 ` Jiang Liu
2014-07-25 1:44 ` Jiang Liu
2014-07-25 1:44 ` Jiang Liu
2014-07-11 8:29 ` [RFC Patch V1 00/30] Enable memoryless node on x86 platforms Peter Zijlstra
2014-07-11 8:29 ` Peter Zijlstra
2014-07-11 8:29 ` Peter Zijlstra
2014-07-11 15:33 ` Greg KH
2014-07-11 15:33 ` Greg KH
2014-07-11 15:33 ` Greg KH
2014-07-11 20:02 ` Dave Hansen [this message]
2014-07-11 20:02 ` Dave Hansen
2014-07-11 20:02 ` Dave Hansen
2014-07-11 20:20 ` Andi Kleen
2014-07-11 20:20 ` Andi Kleen
2014-07-11 20:20 ` Andi Kleen
2014-07-11 20:51 ` Peter Zijlstra
2014-07-11 20:51 ` Peter Zijlstra
2014-07-11 20:51 ` Peter Zijlstra
2014-07-11 21:58 ` Andi Kleen
2014-07-11 21:58 ` Andi Kleen
2014-07-11 21:58 ` Andi Kleen
2014-07-15 1:18 ` David Rientjes
2014-07-15 1:18 ` David Rientjes
2014-07-15 1:18 ` David Rientjes
2014-07-11 23:51 ` H. Peter Anvin
2014-07-11 23:51 ` H. Peter Anvin
2014-07-11 23:51 ` H. Peter Anvin
2014-07-11 22:40 ` Jiri Kosina
2014-07-11 22:40 ` Jiri Kosina
2014-07-11 22:40 ` Jiri Kosina
2014-07-15 1:19 ` David Rientjes
2014-07-15 1:19 ` David Rientjes
2014-07-15 1:19 ` David Rientjes
2014-07-18 17:48 ` Nish Aravamudan
2014-07-21 17:23 ` Nishanth Aravamudan
2014-07-21 17:23 ` Nishanth Aravamudan
2014-07-21 17:23 ` Nishanth Aravamudan
2014-07-21 17:41 ` Tony Luck
2014-07-21 17:41 ` Tony Luck
2014-07-21 17:41 ` Tony Luck
2014-07-21 17:57 ` Nishanth Aravamudan
2014-07-21 17:57 ` Nishanth Aravamudan
2014-07-21 17:57 ` Nishanth Aravamudan
2014-07-23 8:20 ` Jiang Liu
2014-07-23 8:20 ` Jiang Liu
2014-07-23 8:20 ` Jiang Liu
2014-07-24 23:32 ` Nishanth Aravamudan
2014-07-24 23:32 ` Nishanth Aravamudan
2014-07-24 23:32 ` Nishanth Aravamudan
2014-07-25 1:50 ` Jiang Liu
2014-07-25 1:50 ` Jiang Liu
2014-07-25 1:50 ` Jiang Liu
2014-08-18 23:30 ` Nishanth Aravamudan
2014-08-18 23:30 ` Nishanth Aravamudan
2014-08-18 23:30 ` Nishanth Aravamudan
2014-07-21 20:06 ` Peter Zijlstra
2014-07-21 20:06 ` Peter Zijlstra
2014-07-21 20:06 ` Peter Zijlstra
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