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From: Alexander Duyck <alexander.h.duyck@linux.intel.com>
To: Tejun Heo <tj@kernel.org>
Cc: len.brown@intel.com, linux-pm@vger.kernel.org,
	gregkh@linuxfoundation.org, linux-nvdimm@lists.01.org,
	jiangshanlai@gmail.com, linux-kernel@vger.kernel.org,
	zwisler@kernel.org, pavel@ucw.cz, rafael@kernel.org,
	akpm@linux-foundation.org
Subject: Re: [RFC workqueue/driver-core PATCH 1/5] workqueue: Provide queue_work_near to queue work near a given NUMA node
Date: Wed, 26 Sep 2018 15:05:17 -0700	[thread overview]
Message-ID: <9b002bbb-3e6d-9e99-d8f9-36df4306093e@linux.intel.com> (raw)
In-Reply-To: <20180926215307.GA270328@devbig004.ftw2.facebook.com>



On 9/26/2018 2:53 PM, Tejun Heo wrote:
> Hello,
> 
> On Wed, Sep 26, 2018 at 02:51:38PM -0700, Alexander Duyck wrote:
>> This patch provides a new function queue_work_near which is meant to
>> schedule work on the nearest unbound CPU to the requested NUMA node. The
>> main motivation for this is to help assist asynchronous init to better
>> improve boot times for devices that are local to a specific node.
>>
>> Signed-off-by: Alexander Duyck <alexander.h.duyck@linux.intel.com>
> 
> Why not just use unbound workqueues, which are NUMA-affine by default?
> Are there big enough advantages?
> 
> Thanks.

I am using unbound workqueues. However there isn't an interface that 
exposes the NUMA bits of them directly. All I am doing with this patch 
is adding "queue_work_near" which takes a NUMA node as an argument and 
then copies the logic of "queue_work_on" with the exception that I am 
doing a check to verify that there is an intersection between 
wq_unbound_cpumask and the cpumask of the node, and then passing a CPU 
from that intersection into "__queue_work".

Thanks.

- Alex
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  reply	other threads:[~2018-09-26 22:06 UTC|newest]

Thread overview: 25+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2018-09-26 21:51 [RFC workqueue/driver-core PATCH 0/5] Add NUMA aware async_schedule calls Alexander Duyck
2018-09-26 21:51 ` [RFC workqueue/driver-core PATCH 1/5] workqueue: Provide queue_work_near to queue work near a given NUMA node Alexander Duyck
2018-09-26 21:53   ` Tejun Heo
2018-09-26 22:05     ` Alexander Duyck [this message]
2018-09-26 22:09       ` Tejun Heo
2018-09-26 22:19         ` Alexander Duyck
2018-10-01 16:01           ` Tejun Heo
2018-10-01 21:54             ` Alexander Duyck
2018-10-02 17:41               ` Tejun Heo
2018-10-02 18:23                 ` Alexander Duyck
2018-10-02 18:41                   ` Tejun Heo
2018-10-02 20:49                     ` Alexander Duyck
2018-09-26 21:51 ` [RFC workqueue/driver-core PATCH 2/5] async: Add support for queueing on specific " Alexander Duyck
2018-09-27  0:31   ` Dan Williams
2018-09-27 15:16     ` Alexander Duyck
2018-09-27 19:48       ` Dan Williams
2018-09-27 20:03         ` Alexander Duyck
2018-09-26 21:51 ` [RFC workqueue/driver-core PATCH 3/5] driver core: Probe devices asynchronously instead of the driver Alexander Duyck
2018-09-27  0:48   ` Dan Williams
2018-09-27 15:27     ` Alexander Duyck
2018-09-28  2:48       ` Dan Williams
2018-09-26 21:51 ` [RFC workqueue/driver-core PATCH 4/5] driver core: Use new async_schedule_dev command Alexander Duyck
2018-09-28 17:42   ` Dan Williams
2018-09-26 21:52 ` [RFC workqueue/driver-core PATCH 5/5] nvdimm: Schedule device registration on node local to the device Alexander Duyck
2018-09-28 17:46   ` Dan Williams

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