From: Andrew Morton <akpm@linux-foundation.org>
To: Tejun Heo <tj@kernel.org>
Cc: Dou Liyang <douly.fnst@cn.fujitsu.com>,
cl@linux.com, mika.j.penttila@gmail.com, mingo@redhat.com,
rjw@rjwysocki.net, hpa@zytor.com, yasu.isimatu@gmail.com,
isimatu.yasuaki@jp.fujitsu.com, kamezawa.hiroyu@jp.fujitsu.com,
izumi.taku@jp.fujitsu.com, gongzhaogang@inspur.com,
len.brown@intel.com, lenb@kernel.org, tglx@linutronix.de,
chen.tang@easystack.cn, rafael@kernel.org, x86@kernel.org,
linux-acpi@vger.kernel.org, linux-kernel@vger.kernel.org,
linux-mm@kvack.org
Subject: Re: [PATCH v9 0/7] Make cpuid <-> nodeid mapping persistent
Date: Mon, 25 Jul 2016 17:25:49 -0700 [thread overview]
Message-ID: <20160725172549.e5a23d495a356f026fbb28fa@linux-foundation.org> (raw)
In-Reply-To: <20160726001151.GN19588@mtj.duckdns.org>
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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next prev parent reply other threads:[~2016-07-26 0:31 UTC|newest]
Thread overview: 15+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-07-25 8:35 Dou Liyang
2016-07-25 8:35 ` [PATCH v9 1/7] x86, memhp, numa: Online memory-less nodes at boot time Dou Liyang
2016-07-25 8:35 ` [PATCH v9 2/7] x86, acpi, cpu-hotplug: Enable acpi to register all possible cpus " Dou Liyang
2016-07-25 8:35 ` [PATCH v9 3/7] x86, acpi, cpu-hotplug: Introduce cpuid_to_apicid[] array to store persistent cpuid <-> apicid mapping Dou Liyang
2016-07-25 8:35 ` [PATCH v9 4/7] x86, acpi, cpu-hotplug: Enable MADT APIs to return disabled apicid Dou Liyang
2016-07-25 8:35 ` [PATCH v9 5/7] x86, acpi, cpu-hotplug: Set persistent cpuid <-> nodeid mapping when booting Dou Liyang
2016-07-25 8:35 ` [PATCH v9 6/7] acpi: Provide the mechanism to validate processors in the ACPI tables Dou Liyang
2016-07-25 8:35 ` [PATCH v9 7/7] acpi: Provide the interface to validate the proc_id Dou Liyang
2016-07-25 23:20 ` [PATCH v9 0/7] Make cpuid <-> nodeid mapping persistent Andrew Morton
2016-07-26 0:11 ` Tejun Heo
2016-07-26 0:25 ` Andrew Morton [this message]
2016-07-26 1:03 ` Tejun Heo
2016-07-26 3:59 ` Dou Liyang
2016-07-26 11:53 ` Rafael J. Wysocki
2016-07-27 1:18 ` Dou Liyang
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