From: Yunsheng Lin <linyunsheng@huawei.com>
To: Michal Hocko <mhocko@kernel.org>, Peter Zijlstra <peterz@infradead.org>
Cc: <catalin.marinas@arm.com>, <will@kernel.org>, <mingo@redhat.com>,
<bp@alien8.de>, <rth@twiddle.net>, <ink@jurassic.park.msu.ru>,
<mattst88@gmail.com>, <benh@kernel.crashing.org>,
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<jiaxun.yang@flygoat.com>, <chenhc@lemote.com>,
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<rafael@kernel.org>, <gregkh@linuxfoundation.org>
Subject: Re: [PATCH v6] numa: make node_to_cpumask_map() NUMA_NO_NODE aware
Date: Wed, 25 Sep 2019 17:14:20 +0800 [thread overview]
Message-ID: <1adcbe68-6753-3497-48a0-cc84ac503372@huawei.com> (raw)
In-Reply-To: <20190924131939.GS23050@dhcp22.suse.cz>
On 2019/9/24 21:19, Michal Hocko wrote:
> On Tue 24-09-19 14:59:36, Peter Zijlstra wrote:
>> On Tue, Sep 24, 2019 at 02:43:25PM +0200, Peter Zijlstra wrote:
>>> On Tue, Sep 24, 2019 at 02:25:00PM +0200, Michal Hocko wrote:
>>>> On Tue 24-09-19 14:09:43, Peter Zijlstra wrote:
>>>
>>>>> We can push back and say we don't respect the specification because it
>>>>> is batshit insane ;-)
>>>>
>>>> Here is my fingers crossed.
>>>>
>>>> [...]
>>>>
>>>>> Now granted; there's a number of virtual devices that really don't have
>>>>> a node affinity, but then, those are not hurt by forcing them onto a
>>>>> random node, they really don't do anything. Like:
>>>>
>>>> Do you really consider a random node a better fix than simply living
>>>> with a more robust NUMA_NO_NODE which tells the actual state? Page
>>>> allocator would effectivelly use the local node in that case. Any code
>>>> using the cpumask will know that any of the online cpus are usable.
>>>
>>> For the pmu devices? Yes, those 'devices' aren't actually used for
>>> anything other than sysfs entries.
>>>
>>> Nothing else uses the struct device.
>>
>> The below would get rid of the PMU and workqueue warnings with no
>> side-effects (the device isn't used for anything except sysfs).
>
> Hardcoding to 0 is simply wrong, if the node0 is cpuless for example...
Hi, Peter & Michal
From the discussion above, It seems making the node_to_cpumask_map()
NUMA_NO_NODE aware is the most feasible way to move forwad.
Any suggestion?
>
next prev parent reply other threads:[~2019-09-25 9:14 UTC|newest]
Thread overview: 53+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-09-17 12:48 [PATCH v6] numa: make node_to_cpumask_map() NUMA_NO_NODE aware Yunsheng Lin
2019-09-23 15:15 ` Peter Zijlstra
2019-09-23 15:28 ` Michal Hocko
2019-09-23 15:48 ` Peter Zijlstra
2019-09-23 16:52 ` Michal Hocko
2019-09-23 20:34 ` Peter Zijlstra
2019-09-24 1:29 ` Yunsheng Lin
2019-09-24 9:25 ` Peter Zijlstra
2019-09-24 11:07 ` Yunsheng Lin
2019-09-24 11:28 ` Peter Zijlstra
2019-09-24 11:44 ` Yunsheng Lin
2019-09-24 11:58 ` Peter Zijlstra
2019-09-24 12:09 ` Yunsheng Lin
2019-09-24 7:47 ` Michal Hocko
2019-09-24 9:17 ` Peter Zijlstra
2019-09-24 10:56 ` Michal Hocko
2019-09-24 11:23 ` Peter Zijlstra
2019-09-24 11:54 ` Michal Hocko
2019-09-24 12:09 ` Peter Zijlstra
2019-09-24 12:25 ` Michal Hocko
2019-09-24 12:43 ` Peter Zijlstra
2019-09-24 12:59 ` Peter Zijlstra
2019-09-24 13:19 ` Michal Hocko
2019-09-25 9:14 ` Yunsheng Lin [this message]
2019-09-25 10:41 ` Peter Zijlstra
2019-10-08 8:38 ` Yunsheng Lin
2019-10-09 12:25 ` Robin Murphy
2019-10-10 6:07 ` Yunsheng Lin
2019-10-10 7:32 ` Michal Hocko
2019-10-11 3:27 ` Yunsheng Lin
2019-10-11 11:15 ` Peter Zijlstra
2019-10-12 6:17 ` Yunsheng Lin
2019-10-12 7:40 ` Greg KH
2019-10-12 9:47 ` Yunsheng Lin
2019-10-12 10:40 ` Greg KH
2019-10-12 10:47 ` Greg KH
2019-10-14 8:00 ` Yunsheng Lin
2019-10-14 9:25 ` Greg KH
2019-10-14 9:49 ` Peter Zijlstra
2019-10-14 10:04 ` Greg KH
2019-10-15 10:40 ` Yunsheng Lin
2019-10-15 16:58 ` Greg KH
2019-10-16 12:07 ` Yunsheng Lin
2019-10-28 9:20 ` Yunsheng Lin
2019-10-29 8:53 ` Michal Hocko
2019-10-30 1:58 ` Yunsheng Lin
2019-10-10 8:56 ` Peter Zijlstra
2019-09-25 10:40 ` Peter Zijlstra
2019-09-25 13:25 ` Michal Hocko
2019-09-25 16:31 ` Peter Zijlstra
2019-09-25 21:45 ` Peter Zijlstra
2019-09-26 9:05 ` Peter Zijlstra
2019-09-26 12:10 ` Peter Zijlstra
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