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Re: [PATCH v9 0/7] Make cpuid <-> nodeid mapping persistent

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On Mon, 25 Jul 2016 20:11:51 -0400 Tejun Heo <tj@kernel.org> wrote:

> Hello, Andrew.
> 
> On Mon, Jul 25, 2016 at 04:20:22PM -0700, Andrew Morton wrote:
> > > When a pool workqueue is initialized, if its cpumask belongs to a node, its
> > > pool->node will be mapped to that node. And memory used by this workqueue will
> > > also be allocated on that node.
> > 
> > Plan B is to hunt down and fix up all the workqueue structures at
> > hotplug-time.  Has that option been evaluated?
> > 
> > Your fix is x86-only and this bug presumably affects other
> > architectures, yes?  I think a "Plan B" would fix all architectures?
> 
> Yeah, that was one of the early approaches.  The issue isn't limited
> to wq.  Any memory allocation can have similar issues of underlying
> node association changing and we don't have any synchronization
> mechanism around it.  It doesn't make any sense to make NUMA
> association dynamic when the consumer surface is vastly larger and
> there's nothing inherently dynamic about the association itself.

And other architectures?

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[PATCH v9 0/7] Make cpuid <-> nodeid mapping persistent Dou Liyang <douly.fnst@cn.fujitsu.com> - 2016-07-25 10:40 +0200
  [PATCH v9 3/7] x86, acpi, cpu-hotplug: Introduce cpuid_to_apicid[] array to store persistent cpuid <-> apicid mapping. Dou Liyang <douly.fnst@cn.fujitsu.com> - 2016-07-25 10:40 +0200
  [PATCH v9 4/7] x86, acpi, cpu-hotplug: Enable MADT APIs to return disabled apicid. Dou Liyang <douly.fnst@cn.fujitsu.com> - 2016-07-25 10:40 +0200
  [PATCH v9 6/7] acpi: Provide the mechanism to validate processors in the ACPI tables Dou Liyang <douly.fnst@cn.fujitsu.com> - 2016-07-25 10:40 +0200
  [PATCH v9 5/7] x86, acpi, cpu-hotplug: Set persistent cpuid <-> nodeid mapping when booting. Dou Liyang <douly.fnst@cn.fujitsu.com> - 2016-07-25 10:40 +0200
  [PATCH v9 2/7] x86, acpi, cpu-hotplug: Enable acpi to register all possible cpus at boot time. Dou Liyang <douly.fnst@cn.fujitsu.com> - 2016-07-25 10:40 +0200
  Re: [PATCH v9 0/7] Make cpuid <-> nodeid mapping persistent Andrew Morton <akpm@linux-foundation.org> - 2016-07-26 01:30 +0200
    Re: [PATCH v9 0/7] Make cpuid <-> nodeid mapping persistent Tejun Heo <tj@kernel.org> - 2016-07-26 02:20 +0200
      Re: [PATCH v9 0/7] Make cpuid <-> nodeid mapping persistent Andrew Morton <akpm@linux-foundation.org> - 2016-07-26 02:30 +0200
        Re: [PATCH v9 0/7] Make cpuid <-> nodeid mapping persistent Tejun Heo <tj@kernel.org> - 2016-07-26 03:10 +0200
    Re: [PATCH v9 0/7] Make cpuid <-> nodeid mapping persistent Dou Liyang <douly.fnst@cn.fujitsu.com> - 2016-07-26 06:10 +0200
      Re: [PATCH v9 0/7] Make cpuid <-> nodeid mapping persistent "Rafael J. Wysocki" <rjw@rjwysocki.net> - 2016-07-26 13:50 +0200
        Re: [PATCH v9 0/7] Make cpuid <-> nodeid mapping persistent Dou Liyang <douly.fnst@cn.fujitsu.com> - 2016-07-27 03:20 +0200

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