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SubjectRe: [PATCH v7 0/5] Make cpuid <-> nodeid mapping persistent

On 05/19/2016 10:46 PM, Peter Zijlstra wrote:
> On Thu, May 19, 2016 at 06:39:41PM +0800, Zhu Guihua wrote:
>> [Problem]
>> cpuid <-> nodeid mapping is firstly established at boot time. And workqueue caches
>> the mapping in wq_numa_possible_cpumask in wq_numa_init() at boot time.
>> When doing node online/offline, cpuid <-> nodeid mapping is established/destroyed,
>> which means, cpuid <-> nodeid mapping will change if node hotplug happens. But
>> workqueue does not update wq_numa_possible_cpumask.
> So why are you not fixing up wq_numa_possible_cpumask instead? That
> seems the far easier solution.

We tried to do that. You can see our patch at

But maintainer thought, we should establish persistent cpuid<->nodeid
there is no need to change the map.

Cc TJ,
Could we return to workqueue to fix this?


> Do all the other archs that support NUMA and HOTPLUG have the mapping
> stable, or will you now go fix each and every one of them?
> .

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