linux-kernel - Re: [PATCH] iwlwifi: dvm: convert create_singlethread_workqueue() to alloc

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Message-ID: <20160317132110.GP21104@mtj.duckdns.org>
Date:	Thu, 17 Mar 2016 06:21:10 -0700
From:	Tejun Heo <tj@...nel.org>
To:	Johannes Berg <johannes@...solutions.net>
Cc:	Eva Rachel Retuya <eraretuya@...il.com>,
	outreachy-kernel@...glegroups.com, emmanuel.grumbach@...el.com,
	linuxwifi@...el.com, kvalo@...eaurora.org,
	linux-wireless@...r.kernel.org, netdev@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] iwlwifi: dvm: convert create_singlethread_workqueue() to
 alloc_workqueue()

Hello,

On Thu, Mar 17, 2016 at 01:43:22PM +0100, Johannes Berg wrote:
> On Thu, 2016-03-17 at 20:37 +0800, Eva Rachel Retuya wrote:
> > Use alloc_workqueue() to allocate the workqueue instead of
> > create_singlethread_workqueue() since the latter is deprecated and is
> > scheduled for removal.
> 
> Scheduled where?

They've been deprecated for years now.  I should note that in the
header.

> >  static void iwl_setup_deferred_work(struct iwl_priv *priv)
> >  {
> > -	priv->workqueue = create_singlethread_workqueue(DRV_NAME);
> > +	priv->workqueue = alloc_workqueue(DRV_NAME, WQ_HIGHPRI |
> > WQ_UNBOUND |
> > +					  WQ_MEM_RECLAIM, 1);
> 
> Seems like you should use alloc_ordered_workqueue() though? That also
> gets you UNBOUND immediately, and the "1".

Right, this one should have been alloc_ordered_workqueue().

> I'm not really sure HIGHPRI is needed either.

So, no WQ_MEM_RECLAIM either then, I suppose?  What are the latency
requirements here - what happens if a thermal management work gets
delayed?

Thanks.

-- 
tejun