From: Michal Hocko <mhocko@kernel.org>
To: "Leizhen (ThunderTown)" <thunder.leizhen@huawei.com>
Cc: Thomas Gleixner <tglx@linutronix.de>,
Ingo Molnar <mingo@redhat.com>, "H. Peter Anvin" <hpa@zytor.com>,
Catalin Marinas <catalin.marinas@arm.com>,
Will Deacon <will.deacon@arm.com>,
linux-arm-kernel <linux-arm-kernel@lists.infradead.org>,
linux-mm <linux-mm@kvack.org>,
linux-kernel <linux-kernel@vger.kernel.org>,
chenchunxiao <chenchunxiao@huawei.com>, x86l <x86@kernel.org>,
linux-api@vger.kernel.org
Subject: Re: [Question or BUG] [NUMA]: I feel puzzled at the function cpumask_of_node
Date: Thu, 8 Jun 2017 16:12:15 +0200 [thread overview]
Message-ID: <20170608141214.GJ19866@dhcp22.suse.cz> (raw)
In-Reply-To: <5937C608.7010905@huawei.com>
[CC linux-api]
On Wed 07-06-17 17:23:20, Leizhen (ThunderTown) wrote:
> When I executed numactl -H(print cpumask_of_node for each node), 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. Actually, all other ARCHs is the same to ARM64.
>
> So, my question is: Which case(online or possible) should function
> cpumask_of_node be? Or there is no matter about it?
Unfortunatelly the documentation is quite unclear
What: /sys/devices/system/node/nodeX/cpumap
Date: October 2002
Contact: Linux Memory Management list <linux-mm@kvack.org>
Description:
The node's cpumap.
not really helpeful, is it? Semantically I _think_ printing online cpus
makes more sense because it doesn't really make much sense to bind
anything on offline nodes. Generic implementtion of cpumask_of_node
indeed provides only online cpus. I haven't checked specific
implementations of arch specific code but listing offline cpus sounds
confusing to me.
--
Michal Hocko
SUSE Labs
next prev parent reply other threads:[~2017-06-08 14:12 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-06-07 9:23 [Question or BUG] [NUMA]: I feel puzzled at the function cpumask_of_node Leizhen (ThunderTown)
2017-06-08 14:12 ` Michal Hocko [this message]
2017-06-15 2:00 ` Leizhen (ThunderTown)
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