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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Message-ID: <20180926215307.GA270328@devbig004.ftw2.facebook.com>
Date:   Wed, 26 Sep 2018 14:53:07 -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 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@...ux.intel.com>

Why not just use unbound workqueues, which are NUMA-affine by default?
Are there big enough advantages?

Thanks.

-- 
tejun