linux-kernel - Re: [workqueue/driver-core PATCH v2 4/5] driver core: Attach devices on CPU local to device node

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Date:   Thu, 11 Oct 2018 12:45:01 +0200
From:   Greg KH <gregkh@...uxfoundation.org>
To:     Alexander Duyck <alexander.h.duyck@...ux.intel.com>
Cc:     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 4/5] driver core: Attach devices
 on CPU local to device node

On Wed, Oct 10, 2018 at 04:08:40PM -0700, Alexander Duyck wrote:
> This change makes it so that we call the asynchronous probe routines on a
> CPU local to the device node. By doing this we should be able to improve
> our initialization time significantly as we can avoid having to access the
> device from a remote node which may introduce higher latency.

This is nice in theory, but what kind of real numbers does this show?
There's a lot of added complexity here, and what is the benifit?

Benchmarks or bootcharts that we can see would be great to have, thanks.

greg k-h