From mboxrd@z Thu Jan 1 00:00:00 1970 From: Arjan van de Ven Subject: Re: [PATCH 0/3] coupled cpuidle state support Date: Wed, 21 Dec 2011 20:36:12 +0100 Message-ID: <4EF2352C.3060102@linux.intel.com> References: <1324426147-16735-1-git-send-email-ccross@android.com> <4EF1A0B4.5080307@linux.intel.com> <4EF1AA8A.8060304@linux.intel.com> <4EF1CD49.9020800@linux.intel.com> Mime-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: 7bit Return-path: In-Reply-To: Sender: linux-tegra-owner-u79uwXL29TY76Z2rM5mHXA@public.gmane.org To: Colin Cross Cc: linux-kernel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org, linux-arm-kernel-IAPFreCvJWM7uuMidbF8XUB+6BGkLq7r@public.gmane.org, linux-pm-cunTk1MwBs9QetFLy7KEm3xJsTq8ys+cHZ5vskTnxNA@public.gmane.org, Len Brown , Kevin Hilman , Santosh Shilimkar , Amit Kucheria , Trinabh Gupta , Deepthi Dharwar , linux-omap-u79uwXL29TY76Z2rM5mHXA@public.gmane.org, linux-tegra-u79uwXL29TY76Z2rM5mHXA@public.gmane.org List-Id: linux-omap@vger.kernel.org >> >> .. or it enters WFI, and a physical device sends it an interrupt, >> at which point it exits. > > None of the cpus will return to the idle loop until all cpus have > decremented the ready counter back to 0, so they can't wrap around > again. yikes, so you IPI all the cpus on the first exit. that must burn power ;-(