linux-kernel - Re: [PATCH v2 1/1] mm: only dispaly online cpus of the numa node

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Date:   Tue, 03 Oct 2017 12:22:44 +1100
From:   Michael Ellerman <mpe@...erman.id.au>
To:     Zhen Lei <thunder.leizhen@...wei.com>,
        Catalin Marinas <catalin.marinas@....com>,
        Will Deacon <will.deacon@....com>,
        linux-kernel <linux-kernel@...r.kernel.org>,
        linux-api <linux-api@...r.kernel.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Michal Hocko <mhocko@...e.com>, linux-mm <linux-mm@...ck.org>
Cc:     Tianhong Ding <dingtianhong@...wei.com>,
        Hanjun Guo <guohanjun@...wei.com>,
        Libin <huawei.libin@...wei.com>,
        Kefeng Wang <wangkefeng.wang@...wei.com>,
        Zhen Lei <thunder.leizhen@...wei.com>
Subject: Re: [PATCH v2 1/1] mm: only dispaly online cpus of the numa node

Zhen Lei <thunder.leizhen@...wei.com> writes:

> When I executed numactl -H(which read /sys/devices/system/node/nodeX/cpumap
> and display cpumask_of_node for each node), but I got different result on
> X86 and arm64. For each numa node, the former only displayed online CPUs,
> and the latter displayed all possible CPUs. Unfortunately, both Linux
> documentation and numactl manual have not described it clear.

FWIW powerpc happens to implement the x86 behaviour, online CPUs only.

cheers