linux-kernel - Re: [PATCH 0/8] workqueue: advance concurrency management

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Message-ID: <20130419181155.GA13811@mtj.dyndns.org>
Date:	Fri, 19 Apr 2013 11:11:55 -0700
From:	Tejun Heo <tj@...nel.org>
To:	Lai Jiangshan <eag0628@...il.com>
Cc:	LKML <linux-kernel@...r.kernel.org>,
	Lai Jiangshan <laijs@...fujitsu.com>
Subject: Re: [PATCH 0/8] workqueue: advance concurrency management

Hey,

On Fri, Apr 19, 2013 at 06:10:57AM +0800, Lai Jiangshan wrote:
> Ping.

Sorry, I've been at collab summit / lsf.  Plus, it's a bit too late
for for-3.10 anyway.  Anyways, after glancing over it, here are my
preliminary thoughts.  The first one looks good but I'm not sure about
dropping nr_running adjustment.  The only real benefit coming from
that is dropping a sched callback and if there's any performance /
overhead impact, I'm afraid it's gonna be negative.  There are actual
benefits in using as few tasks as possible - the cache footprint gets
smaller, so unless there's a clear indication that the suggested
behavior is better in some way, I'm not sure what we're buying with
the proposed changes.

Thanks.

-- 
tejun
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