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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Date:   Thu, 11 Oct 2018 19:02:04 +0200
From:   Greg KH <gregkh@...uxfoundation.org>
To:     Alexander Duyck <alexander.h.duyck@...ux.intel.com>
Cc:     Tejun Heo <tj@...nel.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 Thu, Oct 11, 2018 at 09:49:59AM -0700, Alexander Duyck wrote:
> 
> 
> On 10/11/2018 8:04 AM, Tejun Heo wrote:
> > 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.
> 
> I would be good with routing the patches through you if that works. I had
> included you, Greg, and Andrew as I wasn't sure how you guys had wanted this
> routed since this affected both the workqueue and device trees.
> 
> I'll update the patches to resolve the lack of kerneldoc for the new
> "async_" functions and add some comments to the patch descriptions on the
> gains seen related to some of the specific patches for v3.

As Tejun has acked this, and it affects the driver core, I'll be glad to
take it.

thanks,

greg k-h