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Message-ID: <20121113172449.0f7b1754@chromoly> 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 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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