Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S266891AbUJWKyC (ORCPT ); Sat, 23 Oct 2004 06:54:02 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S267170AbUJWKyC (ORCPT ); Sat, 23 Oct 2004 06:54:02 -0400 Received: from chiark.greenend.org.uk ([193.201.200.170]:37327 "EHLO chiark.greenend.org.uk") by vger.kernel.org with ESMTP id S266891AbUJWKyA (ORCPT ); Sat, 23 Oct 2004 06:54:00 -0400 To: Lee Revell Cc: linux-kernel@vger.kernel.org Subject: Re: How is user space notified of CPU speed changes? In-Reply-To: <1098508238.13176.17.camel@krustophenia.net> References: <1098399709.4131.23.camel@krustophenia.net> <1098444170.19459.7.camel@localhost.localdomain> <1098444170.19459.7.camel@localhost.localdomain> <1098508238.13176.17.camel@krustophenia.net> Date: Sat, 23 Oct 2004 11:53:54 +0100 Message-Id: From: Matthew Garrett Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 868 Lines: 21 Lee Revell wrote: > On Fri, 2004-10-22 at 12:23 +0100, Alan Cox wrote: >> No it did not. It has never been a safe assumption. > > OK, thanks. Still no answer to my original question though. > > JACK makes extensive use of microsecond-level timers. These must be > calibrated at startup, and recalibrated when the CPU speed changes. How > does JACK register with the kernel to be notified when the CPU speed > changes? The kernel does not always know when the CPU speed changes. This makes notification somewhat harder. -- Matthew Garrett | mjg59-chiark.mail.linux-rutgers.kernel@srcf.ucam.org - 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/