linux-kernel - Re: [PATCH 2/3] cpuidle: Add a debugfs entry to disable specific C state for debug purpose.

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Message-ID: <20120312204629.GA22929@srcf.ucam.org>
Date:	Mon, 12 Mar 2012 20:46:30 +0000
From:	Matthew Garrett <mjg59@...f.ucam.org>
To:	ShuoX Liu <shuox.liu@...el.com>
Cc:	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Greg KH <gregkh@...uxfoundation.org>,
	Yanmin Zhang <yanmin_zhang@...ux.intel.com>,
	"H. Peter Anvin" <hpa@...or.com>,
	"Valentin, Eduardo" <eduardo.valentin@...com>,
	Henrique de Moraes Holschuh <hmh@....eng.br>,
	"Brown, Len" <len.brown@...el.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Ingo Molnar <mingo@...e.hu>,
	"Kleen, Andi" <andi.kleen@...el.com>,
	"linux-pm@...ts.linux-foundation.org" 
	<linux-pm@...ts.linux-foundation.org>
Subject: Re: [PATCH 2/3] cpuidle: Add a debugfs entry to disable specific C
 state for debug purpose.

On Mon, Mar 12, 2012 at 05:21:33PM +0800, ShuoX Liu wrote:

> In addition, C state might have much impact on performance tuning,
> as it takes
> much time to enter/exit C states, which might delay interrupt
> processing. With
> the new debug option, developers could check if a deep C state could impact
> performance and how much impact it could cause.

Would anyone doing performance tuning not be using the cpu_dma_latency 
interface?

-- 
Matthew Garrett | mjg59@...f.ucam.org
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