linux-kernel - Re: [PATCH 2/3] kmod: Add up-to-date explanations on the purpose of each asynchronous levels

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Message-ID: <20150708125449.GB9181@lerouge>
Date:	Wed, 8 Jul 2015 14:54:50 +0200
From:	Frederic Weisbecker <fweisbec@...il.com>
To:	Andrew Morton <akpm@...ux-foundation.org>
Cc:	LKML <linux-kernel@...r.kernel.org>,
	Oleg Nesterov <oleg@...hat.com>,
	Christoph Lameter <cl@...ux.com>,
	Rik van Riel <riel@...hat.com>
Subject: Re: [PATCH 2/3] kmod: Add up-to-date explanations on the purpose of
 each asynchronous levels

On Tue, Jul 07, 2015 at 04:07:58PM -0700, Andrew Morton wrote:
> On Mon,  6 Jul 2015 17:33:40 +0200 Frederic Weisbecker <fweisbec@...il.com> wrote:
> 
> > There seem to be quite some confusions on the comments, likely due to
> > changes that came after them.
> > 
> > Now since it's very non obvious why we have 3 levels of asynchronous
> > code to implement usermodehelpers, it's important to comment in detail
> > the reason of this layout.
> 
> There are still a few references to keventd in there.  One of them is
> simply wrong: "runs as a child of keventd".  The userspace code is
> actually a child of the khelper thread, yes?
> 
> I guess we should remove all kernel references to "keventd".  It got
> renamed to "kworker".

Right, I think I missed them because I confused khelper with keventd.
In fact here they are all children of khelper, which is the singlethread
workqueue tied to kmod.

But I'm working on a new iteration that makes use of a global no numa
workqueue.
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