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Re: [Patch V3 3/9] sgi-xp: Replace cpu_to_node() with cpu_to_mem() to support memoryless node

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On Wed, 19 Aug 2015, Jiang Liu wrote:

> > Why not simply fix build_zonelists_node() so that the __GFP_THISNODE 
> > zonelists are set up to reference the zones of cpu_to_mem() for memoryless 
> > nodes?
> > 
> > It seems much better than checking and maintaining every __GFP_THISNODE 
> > user to determine if they are using a memoryless node or not.  I don't 
> > feel that this solution is maintainable in the longterm.
> Hi David,
> 	There are some usage cases, such as memory migration,
> expect the page allocator rejecting memory allocation requests
> if there is no memory on local node. So we have:
> 1) alloc_pages_node(cpu_to_node(), __GFP_THISNODE) to only allocate
> memory from local node.
> 2) alloc_pages_node(cpu_to_mem(), __GFP_THISNODE) to allocate memory
> from local node or from nearest node if local node is memoryless.
> 

Right, so do you think it would be better to make the default zonelists be 
setup so that cpu_to_node()->zonelists == cpu_to_mem()->zonelists and then 
individual callers that want to fail for memoryless nodes check 
populated_zone() themselves?
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[Patch V3 0/9] Enable memoryless node support for x86 Jiang Liu <jiang.liu@linux.intel.com> - 2015-08-17 05:20 +0200
  [Patch V3 6/9] i40evf: Use numa_mem_id() to better support memoryless node Jiang Liu <jiang.liu@linux.intel.com> - 2015-08-17 05:20 +0200
    RE: [Intel-wired-lan] [Patch V3 6/9] i40evf: Use numa_mem_id() to  better support memoryless node "Patil, Kiran" <kiran.patil@intel.com> - 2015-08-17 21:10 +0200
      Re: [Intel-wired-lan] [Patch V3 6/9] i40evf: Use numa_mem_id() to  better support memoryless node Jeff Kirsher <jeffrey.t.kirsher@intel.com> - 2015-08-18 23:40 +0200
  [Patch V3 9/9] mm, x86: Enable memoryless node support to better support CPU/memory hotplug Jiang Liu <jiang.liu@linux.intel.com> - 2015-08-17 05:20 +0200
    Re: [Patch V3 9/9] mm, x86: Enable memoryless node support to better  support CPU/memory hotplug Tang Chen <tangchen@cn.fujitsu.com> - 2015-08-18 08:20 +0200
      Re: [Patch V3 9/9] mm, x86: Enable memoryless node support to better  support CPU/memory hotplug Tang Chen <tangchen@cn.fujitsu.com> - 2015-08-18 13:40 +0200
    Re: [Patch V3 9/9] mm, x86: Enable memoryless node support to better  support CPU/memory hotplug Ingo Molnar <mingo@kernel.org> - 2015-08-18 09:40 +0200
  [Patch V3 1/9] x86, NUMA, ACPI: Online node earlier when doing CPU hot-addition Jiang Liu <jiang.liu@linux.intel.com> - 2015-08-17 05:20 +0200
  [Patch V3 2/9] kernel/profile.c: Replace cpu_to_mem() with cpu_to_node() Jiang Liu <jiang.liu@linux.intel.com> - 2015-08-17 05:20 +0200
    Re: [Patch V3 2/9] kernel/profile.c: Replace cpu_to_mem() with  cpu_to_node() David Rientjes <rientjes@google.com> - 2015-08-18 02:40 +0200
      Re: [Patch V3 2/9] kernel/profile.c: Replace cpu_to_mem() with  cpu_to_node() Jiang Liu <jiang.liu@linux.intel.com> - 2015-08-19 09:20 +0200
        Re: [Patch V3 2/9] kernel/profile.c: Replace cpu_to_mem() with  cpu_to_node() David Rientjes <rientjes@google.com> - 2015-08-20 02:10 +0200
  [Patch V3 4/9] openvswitch: Replace cpu_to_node() with cpu_to_mem() to support memoryless node Jiang Liu <jiang.liu@linux.intel.com> - 2015-08-17 05:20 +0200
    Re: [Patch V3 4/9] openvswitch: Replace cpu_to_node() with  cpu_to_mem() to support memoryless node Pravin Shelar <pshelar@nicira.com> - 2015-08-18 02:20 +0200
  [Patch V3 7/9] x86, numa: Kill useless code to improve code readability Jiang Liu <jiang.liu@linux.intel.com> - 2015-08-17 05:20 +0200
  [Patch V3 3/9] sgi-xp: Replace cpu_to_node() with cpu_to_mem() to support memoryless node Jiang Liu <jiang.liu@linux.intel.com> - 2015-08-17 05:20 +0200
    Re: [Patch V3 3/9] sgi-xp: Replace cpu_to_node() with cpu_to_mem()  to support memoryless node David Rientjes <rientjes@google.com> - 2015-08-18 02:30 +0200
      Re: [Patch V3 3/9] sgi-xp: Replace cpu_to_node() with cpu_to_mem() to  support memoryless node Jiang Liu <jiang.liu@linux.intel.com> - 2015-08-19 10:30 +0200
        Re: [Patch V3 3/9] sgi-xp: Replace cpu_to_node() with cpu_to_mem()  to support memoryless node David Rientjes <rientjes@google.com> - 2015-08-20 02:10 +0200
          Re: [Patch V3 3/9] sgi-xp: Replace cpu_to_node() with cpu_to_mem() to  support memoryless node Jiang Liu <jiang.liu@linux.intel.com> - 2015-08-20 08:40 +0200
    Re: [Patch V3 3/9] sgi-xp: Replace cpu_to_node() with cpu_to_mem() to  support memoryless node Robin Holt <robinmholt@gmail.com> - 2015-08-19 14:00 +0200
      Re: [Patch V3 3/9] sgi-xp: Replace cpu_to_node() with cpu_to_mem() to  support memoryless node Jiang Liu <jiang.liu@linux.intel.com> - 2015-08-19 14:50 +0200
  [Patch V3 5/9] i40e: Use numa_mem_id() to better support memoryless node Jiang Liu <jiang.liu@linux.intel.com> - 2015-08-17 05:20 +0200
    Re: [Patch V3 5/9] i40e: Use numa_mem_id() to better support memoryless  node David Rientjes <rientjes@google.com> - 2015-08-18 02:40 +0200
    RE: [Intel-wired-lan] [Patch V3 5/9] i40e: Use numa_mem_id() to  better support memoryless node "Patil, Kiran" <kiran.patil@intel.com> - 2015-08-20 00:40 +0200
      RE: [Intel-wired-lan] [Patch V3 5/9] i40e: Use numa_mem_id() to  better support memoryless node David Rientjes <rientjes@google.com> - 2015-08-20 02:20 +0200
  [Patch V3 8/9] mm: Update _mem_id_[] for every possible CPU when memory configuration changes Jiang Liu <jiang.liu@linux.intel.com> - 2015-08-17 05:20 +0200
  Re: [Patch V3 0/9] Enable memoryless node support for x86 Andrew Morton <akpm@linux-foundation.org> - 2015-08-17 23:40 +0200
  Re: [Patch V3 0/9] Enable memoryless node support for x86 Tang Chen <tangchen@cn.fujitsu.com> - 2015-08-18 12:10 +0200
    Re: [Patch V3 0/9] Enable memoryless node support for x86 Jiang Liu <jiang.liu@linux.intel.com> - 2015-08-19 10:10 +0200

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