From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753113Ab2B0IiL (ORCPT ); Mon, 27 Feb 2012 03:38:11 -0500 Received: from casper.infradead.org ([85.118.1.10]:57209 "EHLO casper.infradead.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752488Ab2B0IiK convert rfc822-to-8bit (ORCPT ); Mon, 27 Feb 2012 03:38:10 -0500 Message-ID: <1330331881.11248.28.camel@twins> Subject: Re: [PATCH] Extend mwait idle to optimize away CAL and RES interrupts to an idle CPU -v1 From: Peter Zijlstra To: Yong Zhang Cc: Venki Pallipadi , Thomas Gleixner , Ingo Molnar , "H. Peter Anvin" , Suresh Siddha , Aaron Durbin , Paul Turner , linux-kernel@vger.kernel.org Date: Mon, 27 Feb 2012 09:38:01 +0100 In-Reply-To: <20120224061350.GB17543@zhy> References: <1329957415-15239-1-git-send-email-venki@google.com> <1329989454.24994.57.camel@twins> <20120224054150.GA17543@zhy> <20120224061350.GB17543@zhy> Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7BIT X-Mailer: Evolution 3.2.2- Mime-Version: 1.0 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Fri, 2012-02-24 at 14:13 +0800, Yong Zhang wrote: > This remind me that we should have moved the irq_enter()/irq_exit() to > each arch's related irq handler. > see: http://marc.info/?l=linux-kernel&m=130709505700821&w=2 > > So Peter, is there someone alread on it? or it still worth doing now? trouble was that some people didn't feel comfortable adding that overhead to plain resched IPIs that didn't need to do anything. So I more or less let it sit for a while.