From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752880AbcBZAJu (ORCPT ); Thu, 25 Feb 2016 19:09:50 -0500 Received: from cdptpa-outbound-snat.email.rr.com ([107.14.166.231]:59097 "EHLO cdptpa-oedge-vip.email.rr.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1752171AbcBZAJs (ORCPT ); Thu, 25 Feb 2016 19:09:48 -0500 Date: Thu, 25 Feb 2016 19:09:40 -0500 From: Steven Rostedt To: "Shi, Yang" Cc: tj@kernel.org, jack@suse.cz, axboe@fb.com, fengguang.wu@intel.com, tglx@linutronix.de, bigeasy@linutronix.de, akpm@linux-foundation.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org, linux-rt-users@vger.kernel.org, linaro-kernel@lists.linaro.org Subject: Re: [PATCH] writeback: call writeback tracepoints withoud holding list_lock in wb_writeback() Message-ID: <20160225190940.35553f4e@grimm.local.home> In-Reply-To: <56CF9425.20106@linaro.org> References: <1456354043-31420-1-git-send-email-yang.shi@linaro.org> <20160224214042.71c3493b@grimm.local.home> <56CF5848.7050806@linaro.org> <20160225145432.3749e5ec@gandalf.local.home> <56CF8B66.8070108@linaro.org> <20160225183107.1902d42b@gandalf.local.home> <56CF9288.5010406@linaro.org> <56CF9425.20106@linaro.org> X-Mailer: Claws Mail 3.13.2 (GTK+ 2.24.29; x86_64-pc-linux-gnu) MIME-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit X-RR-Connecting-IP: 107.14.168.142:25 X-Cloudmark-Score: 0 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Thu, 25 Feb 2016 15:54:13 -0800 "Shi, Yang" wrote: > Can we disable irqs in tracepoints since spin_lock_irqsave is used by > kernfs_* functions. Disabling preemption or irqs is fine a tracepoint. You just can't sleep, which spin_lock_irqsave() would do on the -rt kernel. -- Steve