linux-kernel - Re: [workqueue/driver-core PATCH v2 1/5] workqueue: Provide queue_work_node to queue work near a given NUMA node

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Message-ID: <20181011150417.GO270328@devbig004.ftw2.facebook.com>
Date:   Thu, 11 Oct 2018 08:04:17 -0700
From:   Tejun Heo <tj@...nel.org>
To:     Alexander Duyck <alexander.h.duyck@...ux.intel.com>
Cc:     gregkh@...uxfoundation.org, akpm@...ux-foundation.org,
        linux-kernel@...r.kernel.org, len.brown@...el.com,
        rafael@...nel.org, linux-pm@...r.kernel.org,
        jiangshanlai@...il.com, pavel@....cz, zwisler@...nel.org
Subject: Re: [workqueue/driver-core PATCH v2 1/5] workqueue: Provide
 queue_work_node to queue work near a given NUMA node

On Wed, Oct 10, 2018 at 04:07:42PM -0700, Alexander Duyck wrote:
> This patch provides a new function queue_work_node which is meant to
> schedule work on a "random" CPU of 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.
> 
> For now we just default to the first CPU that is in the intersection of the
> cpumask of the node and the online cpumask. The only exception is if the
> CPU is local to the node we will just use the current CPU. This should work
> for our purposes as we are currently only using this for unbound work so
> the CPU will be translated to a node anyway instead of being directly used.
> 
> As we are only using the first CPU to represent the NUMA node for now I am
> limiting the scope of the function so that it can only be used with unbound
> workqueues.
> 
> Signed-off-by: Alexander Duyck <alexander.h.duyck@...ux.intel.com>

Acked-by: Tejun Heo <tj@...nel.org>

Please let me know how you wanna route the patch.

Thanks.

-- 
tejun