linux-kernel - Re: [PATCH UPDATED 1/3] vhost: replace vhost

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Message-ID: <4C4DB247.9060709@kernel.org>
Date:	Mon, 26 Jul 2010 18:05:27 +0200
From:	Tejun Heo <tj@...nel.org>
To:	"Michael S. Tsirkin" <mst@...hat.com>
CC:	Oleg Nesterov <oleg@...hat.com>,
	Sridhar Samudrala <sri@...ibm.com>,
	netdev <netdev@...r.kernel.org>,
	lkml <linux-kernel@...r.kernel.org>,
	"kvm@...r.kernel.org" <kvm@...r.kernel.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Dmitri Vorobiev <dmitri.vorobiev@...ial.com>,
	Jiri Kosina <jkosina@...e.cz>,
	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...e.hu>, Andi Kleen <ak@...ux.intel.com>
Subject: Re: [PATCH UPDATED 1/3] vhost: replace vhost_workqueue with per-vhost
 kthread

Hello,

On 07/26/2010 05:50 PM, Michael S. Tsirkin wrote:
>> Hmmm... I'm not quite sure whether it's an optimization.  I thought
>> the patch was due to feeling uncomfortable about using barriers?
> 
> Oh yes. But getting rid of barriers is what motivated me originally.

Yeah, getting rid of barriers is always good.  :-)

> Is there a git tree with kthread_worker applied?
> I might do this just for fun ...

 git://git.kernel.org/pub/scm/linux/kernel/git/tj/wq.git for-next

For the original implementaiton, please take a look at commit
b56c0d8937e665a27d90517ee7a746d0aa05af46.

* Can you please keep the outer goto repeat loop?  I just don't like
  outermost for (;;).

* Placing try_to_freeze() could be a bit annoying.  It shouldn't be
  executed when there's a work to flush.

* I think A - B <= 0 test would be more familiar.  At least
  time_before/after() are implemented that way.

Thanks.

-- 
tejun
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