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Message-ID: <20100503213919.GA18910@srcf.ucam.org> Date: Mon, 3 May 2010 22:39:19 +0100 From: Matthew Garrett <mjg59@...f.ucam.org> To: Kevin Hilman <khilman@...prootsystems.com> Cc: Jonathan Corbet <corbet@....net>, mgross@...ux.intel.com, aili@...eaurora.org, dwalker@...eaurora.org, tiwai@...e.de, bruce.w.allan@...el.com, davidb@...cinc.com, mcgrof@...il.com, pavel@....cz, linux-pm <linux-pm@...ts.linux-foundation.org>, lkml <linux-kernel@...r.kernel.org> Subject: Re: [PATCH]PM QOS refresh against next-20100430 On Mon, May 03, 2010 at 10:01:50AM -0700, Kevin Hilman wrote: > Jonathan Corbet <corbet@....net> writes: > > Well, shallow could mean that the state lacks the CPUIDLE_FLAG_DEEP > > flag; that should be relatively portable. In any case, it seems > > more so than "if I put in a 55us latency requirement, I'll stay out > > of C3". > > I guess it depends on your goal. Do you just want to stay out of C3 > on your current platform? or do you want to stay out of any low-power > state (on any platform) where you'll have a latency of > 55 usecs? I'd say that one plausible requirement is "DMA works", with another being "all interrupts work" as distinguished from "wakeup interrupts work". -- Matthew Garrett | mjg59@...f.ucam.org -- 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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