From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1761847AbcHEUYh (ORCPT ); Fri, 5 Aug 2016 16:24:37 -0400 Received: from mga04.intel.com ([192.55.52.120]:10348 "EHLO mga04.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S2995705AbcHEUYc (ORCPT ); Fri, 5 Aug 2016 16:24:32 -0400 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.28,474,1464678000"; d="scan'208";a="1009256337" Date: Fri, 5 Aug 2016 13:17:41 -0700 From: yunhong jiang To: Mike Galbraith Cc: linux-kernel@vger.kernel.org, linux-rt-users@vger.kernel.org, rostedt@goodmis.org Subject: Re: The timer softirq on the RT kernel Message-ID: <20160805131741.63473d41@jnakajim-build> In-Reply-To: <1470364583.3998.4.camel@gmail.com> References: <20160804173641.4defb00b@jnakajim-build> <1470364583.3998.4.camel@gmail.com> Organization: otc X-Mailer: Claws Mail 3.11.1 (GTK+ 2.24.28; x86_64-redhat-linux-gnu) MIME-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Fri, 05 Aug 2016 04:36:23 +0200 Mike Galbraith wrote: > On Thu, 2016-08-04 at 17:36 -0700, yunhong jiang wrote: > > Hi,Mike & Steven > > On https://lkml.org/lkml/2015/3/24/1178, the patch of > > "timers: do not raise softirq unconditionally" is reverted. Thanks > > for Steven's > > detailed comments, it's quite clear explained. > > I remember Mike has a patch trying to fix it but late > > abandoned. Do you still have any plan to work on this? Otherwise, I > > will have a try. > > Sebastian converted the lock to raw in -rt, so nohz_full now works > without any extra hackery. Hi, Mike, thanks for reply and the update. I still noticed timer softirq on my isolated CPUs, possibly something wrong on my environment. I will re-check it. Thanks --jyh > > -Mike