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

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Message-ID: <20160125111305.GU6357@twins.programming.kicks-ass.net>
Date:	Mon, 25 Jan 2016 12:13:05 +0100
From:	Peter Zijlstra <peterz@...radead.org>
To:	Huang Rui <ray.huang@....com>
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>,
	Frédéric 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 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.