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Message-Id: <1232608558.6101.13.camel@yhuang-dev.sh.intel.com>
Date: Thu, 22 Jan 2009 15:15:58 +0800
From: Huang Ying <ying.huang@...el.com>
To: Herbert Xu <herbert@...dor.apana.org.au>
Cc: "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
"linux-crypto@...r.kernel.org" <linux-crypto@...r.kernel.org>
Subject: Re: [RFC] per-CPU cryptd thread implementation based on workqueue
On Thu, 2009-01-22 at 11:04 +0800, Herbert Xu wrote:
> On Thu, Jan 22, 2009 at 10:32:17AM +0800, Huang Ying wrote:
> >
> > This is the first attempt to use a dedicate workqueue for crypto. It is
> > not intended to be merged. Please feedback your comments, especially on
> > desgin.
>
> Thanks for the patch!
>
> > + spin_lock_init(&cpu_queue->lock);
>
> Since we're switching to per-cpu queues it would be good to just
> kill the spin lock. AFAICS the only place you really need it is
> in cryptd_tfm_in_queue. That's just used for debugging so we can
> just kill it and lose this spin lock.
Yes. Except that, now we do not need a spin lock really. I think the
spin lock may be useful if we enqueue a request on other CPU's queue to
do load balance. And if it is possible that the work_struct to be
executed on CPU other original CPU for CPU hotplug (current code do
not).
Best Regards,
Huang Ying
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