linux-kernel - Re: [PATCH v3] perf/x86/amd/power: Add AMD accumulated power reporting mechanism

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Date:	Mon, 25 Jan 2016 23:43:41 +0800
From:	Huang Rui <ray.huang@....com>
To:	Peter Zijlstra <peterz@...radead.org>
CC:	Borislav Petkov <bp@...e.de>, Ingo Molnar <mingo@...nel.org>,
	"Andy Lutomirski" <luto@...capital.net>,
	Thomas Gleixner <tglx@...utronix.de>,
	Robert Richter <rric@...nel.org>,
	Jacob Shin <jacob.w.shin@...il.com>,
	"John Stultz" <john.stultz@...aro.org>,
	Fr�d�ric Weisbecker <fweisbec@...il.com>,
	<linux-kernel@...r.kernel.org>, <spg_linux_kernel@....com>,
	<x86@...nel.org>, Guenter Roeck <linux@...ck-us.net>,
	Andreas Herrmann <herrmann.der.user@...glemail.com>,
	Suravee Suthikulpanit <suravee.suthikulpanit@....com>,
	Aravind Gopalakrishnan <Aravind.Gopalakrishnan@....com>,
	Borislav Petkov <bp@...en8.de>,
	"Fengguang Wu" <fengguang.wu@...el.com>,
	Aaron Lu <aaron.lu@...el.com>
Subject: Re: [PATCH v3] perf/x86/amd/power: Add AMD accumulated power
 reporting mechanism

On Mon, Jan 25, 2016 at 12:13:05PM +0100, Peter Zijlstra wrote:
> On Mon, Jan 25, 2016 at 04:32:03PM +0800, Huang Rui wrote:
> > +struct power_pmu {
> > +	raw_spinlock_t		lock;
> > +	struct list_head	active_list;
> 
> Maybe a dumb question, but what is that list for?
> 
> You only ever add/del events to/from it, you never iterate it. So why
> keep it?
> 
> If you drop the list, the lock can go too I think, making all this stuff
> simpler.

Yes, the active_list seems a bit superfluous if not be iterated. I
will remove it.

Any other comments? :-)

Thanks,
Rui