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From: Michael Ellerman <mpe@ellerman.id.au>
Subject: Re: [PATCH v2 1/1] mm: only dispaly online cpus of the numa node
In-Reply-To: <1506678805-15392-2-git-send-email-thunder.leizhen@huawei.com>
References: <1506678805-15392-1-git-send-email-thunder.leizhen@huawei.com> <1506678805-15392-2-git-send-email-thunder.leizhen@huawei.com>
Date: Tue, 03 Oct 2017 12:22:44 +1100
Message-ID: <8760bxdnyz.fsf@concordia.ellerman.id.au>
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Sender: owner-linux-mm@kvack.org
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To: Zhen Lei <thunder.leizhen@huawei.com>, Catalin Marinas <catalin.marinas@arm.com>, Will Deacon <will.deacon@arm.com>, linux-kernel <linux-kernel@vger.kernel.org>, linux-api <linux-api@vger.kernel.org>, Greg Kroah-Hartman <gregkh@linuxfoundation.org>, Michal Hocko <mhocko@suse.com>, linux-mm <linux-mm@kvack.org>
Cc: Tianhong Ding <dingtianhong@huawei.com>, Hanjun Guo <guohanjun@huawei.com>, Libin <huawei.libin@huawei.com>, Kefeng Wang <wangkefeng.wang@huawei.com>

Zhen Lei <thunder.leizhen@huawei.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

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