linux-kernel - Re: [PATCH v2.6.36-rc7] infiniband: update workqueue usage

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Date:	Tue, 19 Oct 2010 10:22:06 -0700
From:	Ralph Campbell <ralph.campbell@...gic.com>
To:	Tejun Heo <tj@...nel.org>
CC:	Roland Dreier <rolandd@...co.com>,
	Sean Hefty <sean.hefty@...el.com>,
	Hal Rosenstock <hal.rosenstock@...il.com>,
	"linux-rdma@...r.kernel.org" <linux-rdma@...r.kernel.org>,
	lkml <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v2.6.36-rc7] infiniband: update workqueue usage

On Tue, 2010-10-19 at 08:24 -0700, Tejun Heo wrote:

> * qib_cq_wq is a separate singlethread workqueue.  Does the queue
>   require strict single thread execution ordering?  IOW, does each
>   work have to be executed in the exact queued order and no two works
>   should execute in parallel?  Or was the singlethreadedness chosen
>   just to reduce the number of workers?

The work functions need to be called in-order and single threaded
or memory will be freed multiple times and other "bad things".

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