Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753844AbaGTUe5 (ORCPT ); Sun, 20 Jul 2014 16:34:57 -0400 Received: from bombadil.infradead.org ([198.137.202.9]:59279 "EHLO bombadil.infradead.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753348AbaGTUe4 (ORCPT ); Sun, 20 Jul 2014 16:34:56 -0400 Date: Sun, 20 Jul 2014 22:34:17 +0200 From: Peter Zijlstra To: "Paul E. McKenney" Cc: Frederic Weisbecker , linux-kernel@vger.kernel.org, mingo@kernel.org, laijs@cn.fujitsu.com, dipankar@in.ibm.com, akpm@linux-foundation.org, mathieu.desnoyers@efficios.com, josh@joshtriplett.org, tglx@linutronix.de, rostedt@goodmis.org, dhowells@redhat.com, edumazet@google.com, dvhart@linux.intel.com, oleg@redhat.com, bobby.prani@gmail.com Subject: Re: [PATCH tip/core/rcu] Do not keep timekeeping CPU tick running for non-nohz_full= CPUs Message-ID: <20140720203417.GV9918@twins.programming.kicks-ass.net> References: <20140719165350.GA18411@linux.vnet.ibm.com> <20140719180120.GA20887@localhost.localdomain> <20140720114759.GO8690@linux.vnet.ibm.com> MIME-Version: 1.0 Content-Type: multipart/signed; micalg=pgp-sha1; protocol="application/pgp-signature"; boundary="owRCMvbHJBIqpgHE" Content-Disposition: inline In-Reply-To: <20140720114759.GO8690@linux.vnet.ibm.com> User-Agent: Mutt/1.5.21 (2012-12-30) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org --owRCMvbHJBIqpgHE Content-Type: text/plain; charset=us-ascii Content-Disposition: inline Content-Transfer-Encoding: quoted-printable On Sun, Jul 20, 2014 at 04:47:59AM -0700, Paul E. McKenney wrote: > So we really have to have -all- the CPUs be idle to turn off the timekeep= er. That seems to be pretty unavoidable any which way around. > This won't make the battery-powered embedded guys happy... >=20 > Other thoughts on this? We really should not be setting > CONFIG_NO_HZ_FULL_SYSIDLE by default until this is solved. What are those same guys doing with nohz_full to begin with? --owRCMvbHJBIqpgHE Content-Type: application/pgp-signature -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.12 (GNU/Linux) iQIcBAEBAgAGBQJTzCfDAAoJEHZH4aRLwOS60oYP/R7BP7SFlj6SxxdOmqa2T/Iz 54ZbjJbvYbJp5luvVOjBo8k8jOpaHIHF3fZefsjVswM+ROZQp2ka140fndjkI7NE bFneD6wvA8lzcu3QzoQe06xlijI2ozYvdUXrgVtuuI/h8KHyNjhEv+UU5qA52wcD xuwt9j656IWZ3lWjr5Gur3c9U8K/ZaqHkHXjQxJNZn9g5H25dGh1MdsXCIoEsFGN Vc5KYFn0n1ANvwCNQ5QYe6uhf1bNECZ5YON4rMnp5i4CtcBDEvUnnk//GxYClEQT 0iPri4UFz4vRQ/M24INH3f3TwaMXRpah0DqksWYqYQ0Cy/m4e8MJqO8SkbN7sNDP z/QyrJK0HqzLC6OqUqLNDKRnF6xSIjqwBs3yViIE3uJjWoX7MWiRM0vRg5Xomm+N 2n+235DIYES260JwAhsGT76VIBpbS0saWRGJfGx32MI0XS1GB2qlAtX3oOTLm72o m/e2ETzo7CCUJT+Ffd5/wzFIJhOeo2pK1OsVWO6lwQHEjuS2Nec7qto4sm4DffL+ 7DsxnTQAxdILi+ePtO15rV8VVj79MTcpLN/pglPjUrSnYmiblTPU/FmPTP2TTNmT Vu5cpUWKG8JN77thlpjDv67CVcA9OCIaiVpb+DWqu7fhCqDzcqE1fowcP7vqOBjA 9Cc8m+J8kXUFc1odmafc =m2Z3 -----END PGP SIGNATURE----- --owRCMvbHJBIqpgHE-- -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/