From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1423480AbcB0LRX (ORCPT ); Sat, 27 Feb 2016 06:17:23 -0500 Received: from mail-ob0-f172.google.com ([209.85.214.172]:35816 "EHLO mail-ob0-f172.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1756176AbcB0LRV (ORCPT ); Sat, 27 Feb 2016 06:17:21 -0500 Date: Sat, 27 Feb 2016 06:17:19 -0500 From: Tejun Heo To: Yang Shi Cc: gregkh@linuxfoundation.org, lizefan@huawei.com, tglx@linutronix.de, rostedt@goodmis.org, bigeasy@linutronix.de, linux-kernel@vger.kernel.org, linux-rt-users@vger.kernel.org, linaro-kernel@lists.linaro.org Subject: Re: [RFC V2 PATCH] kernfs: create raw version kernfs_path_len and kernfs_path Message-ID: <20160227111719.GV3965@htj.duckdns.org> References: <1456523259-8588-1-git-send-email-yang.shi@linaro.org> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <1456523259-8588-1-git-send-email-yang.shi@linaro.org> User-Agent: Mutt/1.5.24 (2015-08-30) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Hello, On Fri, Feb 26, 2016 at 01:47:39PM -0800, Yang Shi wrote: > Call synchronize_sched() when kernfs_node is updated since tracepoints are > protected by rcu_read_lock_sched. Adding synchronize_sched() to operations which can be triggered from userland usually turns out to be problematic. If this can't be solved any other way, I think the right thing to do is replacing the path with cgroup id as Christoph suggested. Thanks. -- tejun