linux-kernel - Re: [RFC workqueue/driver-core PATCH 1/5] workqueue: Provide queue_work_near to queue work near a given NUMA node

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Date:   Wed, 26 Sep 2018 15:09:57 -0700
From:   Tejun Heo <tj@...nel.org>
To:     Alexander Duyck <alexander.h.duyck@...ux.intel.com>
Cc:     linux-nvdimm@...ts.01.org, gregkh@...uxfoundation.org,
        linux-pm@...r.kernel.org, linux-kernel@...r.kernel.org,
        akpm@...ux-foundation.org, len.brown@...el.com,
        dave.jiang@...el.com, rafael@...nel.org, vishal.l.verma@...el.com,
        jiangshanlai@...il.com, pavel@....cz, zwisler@...nel.org,
        dan.j.williams@...el.com
Subject: Re: [RFC workqueue/driver-core PATCH 1/5] workqueue: Provide
 queue_work_near to queue work near a given NUMA node

Hello,

On Wed, Sep 26, 2018 at 03:05:17PM -0700, Alexander Duyck wrote:
> 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".

Can it just take a cpu id and not feed that to __queue_work()?  That
looks like a lot of extra logic.

Thanks.

-- 
tejun