Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754253Ab0FQGXZ (ORCPT ); Thu, 17 Jun 2010 02:23:25 -0400 Received: from smtp.nokia.com ([192.100.122.233]:22331 "EHLO mgw-mx06.nokia.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753096Ab0FQGXX convert rfc822-to-8bit (ORCPT ); Thu, 17 Jun 2010 02:23:23 -0400 From: To: , , , Date: Thu, 17 Jun 2010 08:03:50 +0200 Subject: RE: [linux-pm] RFC: /sys/power/policy_preference Thread-Topic: [linux-pm] RFC: /sys/power/policy_preference Thread-Index: AcsNmF3GpDEcA3XkRDaTRBqcEVPSmQASPeLp Message-ID: References: In-Reply-To: Accept-Language: en-US Content-Language: en-GB X-MS-Has-Attach: X-MS-TNEF-Correlator: acceptlanguage: en-US Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 8BIT MIME-Version: 1.0 X-OriginalArrivalTime: 17 Jun 2010 06:03:51.0057 (UTC) FILETIME=[DBBD3010:01CB0DE2] X-Nokia-AV: Clean Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1106 Lines: 25 hi, > From: Len Brown [lenb@kernel.org] policy_preference has 5 levels, from max_performance through max_powersave. Here is how 4 parts of the kernel might respond to those 5 levels: [levels description] i do understand that you are mostly targetting acpi based systems, but even there, based on static leaks, it might not be always true that lower frequencies are correlated to higher power savings (or maybe i have misunderstood your draft - i am not so fluent in acpi) > it is likely > that some users would want to use "powersave" when on > battery and perhaps shift to "performance" on A/C. if we consider also the thermal envelope and the fact that "performance" might steal power from a charging battery, even ton A/C it might not be possible to settle down in one state permanently. Or do you expect other mechanisms to intervene? Cheers, igor-- 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/