linux-kernel - Re: [PATCH 3/3] PM: Introduce Intel PowerClamp Driver

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Date:	Tue, 13 Nov 2012 17:24:49 -0800
From:	Jacob Pan <jacob.jun.pan@...ux.intel.com>
To:	paulmck@...ux.vnet.ibm.com
Cc:	Arjan van de Ven <arjan@...ux.intel.com>,
	Linux PM <linux-pm@...r.kernel.org>,
	LKML <linux-kernel@...r.kernel.org>,
	Rafael Wysocki <rafael.j.wysocki@...el.com>,
	Len Brown <len.brown@...el.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	"H. Peter Anvin" <hpa@...or.com>, Ingo Molnar <mingo@...e.hu>,
	Zhang Rui <rui.zhang@...el.com>, Rob Landley <rob@...dley.net>
Subject: Re: [PATCH 3/3] PM: Introduce Intel PowerClamp Driver

On Tue, 13 Nov 2012 16:03:00 -0800
"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com> wrote:

> Just to make sure I am really understanding what is happening, let's
> suppose we have a HZ=1000 system that has a few tasks that
> occasionally run at prio 99.  These tasks would run during the clamp
> interval, but would (for example) see the jiffies counter remaining
> at the value at the beginning of the clamp interval until the end of
> that interval, when the jiffies counter would suddenly jump by roughly
> six counts, right?

Yes, if there is no interrupts disturb the clamping duration.
We do not mask interrupts which will update jiffies.

-- 
Thanks,

Jacob
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