linux-kernel - Re: [PATCH v6 2/2] cpufreq: covert the cpufreq_data

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Message-ID: <20130402145813.GB31757@gulag1.americas.sgi.com>
Date:	Tue, 2 Apr 2013 09:58:14 -0500
From:	Nathan Zimmer <nzimmer@....com>
To:	"Rafael J. Wysocki" <rjw@...k.pl>
Cc:	Viresh Kumar <viresh.kumar@...aro.org>,
	Nathan Zimmer <nzimmer@....com>, cpufreq@...r.kernel.org,
	linux-pm@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v6 2/2] cpufreq: covert the cpufreq_data_lock to a
	spinlock

On Tue, Apr 02, 2013 at 02:48:07PM +0200, Rafael J. Wysocki wrote:
> On Tuesday, April 02, 2013 10:34:21 AM Viresh Kumar wrote:
> > On 2 April 2013 06:26, Nathan Zimmer <nzimmer@....com> wrote:
> > > On Mon, Apr 01, 2013 at 10:41:27PM +0200, Rafael J. Wysocki wrote:
> > >> On Monday, April 01, 2013 03:11:09 PM Nathan Zimmer wrote:
> > >> > This eliminates the rest of the contention found in __cpufreq_cpu_get.
> > >> > I am not seeing a way to use the rcu so we will have to make due with a
> > >> > rwlock for now.
> > >> >
> > >> > Cc: Viresh Kumar <viresh.kumar@...aro.org>
> > >> > Cc: "Rafael J. Wysocki" <rjw@...k.pl>
> > >> > Signed-off-by: Nathan Zimmer <nzimmer@....com>
> > >>
> > >> I've already applied this one.
> > >>
> > >> Can you please check if the version in my tree is OK?
> > >>
> > >> Rafael
> > >>
> > >
> > > Nope, the previous version was too different, probably best to just replace it.
> > 
> > Nathan,
> > 
> > First of all I should accept that I didn't had your last patch while
> > reviewing this
> > one earlier. Thanks Rafael.
> > 
> > Now, I believe the previous patch which Rafael has pushed was good and we
> > can simply keep it. What you can do is, just add a patch over it (which would
> > mostly be 1/2 of your patchset), that simply separates rcu stuff out of the lock
> > and leave lock for cpufreq_data..
> 
> Yeah, I'd very much prefer that.
> 
> Nathan, I'm going to keep the rwlock patch unless it is demonstrably incorrect.
> 
> Thanks,
> Rafael
> 
> 
> -- 
> I speak only for myself.
> Rafael J. Wysocki, Intel Open Source Technology Center.

Ok I'll go that route.

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