From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-2.5 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, MAILING_LIST_MULTI,SPF_PASS,USER_AGENT_MUTT autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 734CFC46464 for ; Thu, 9 Aug 2018 07:45:30 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 367EB21C69 for ; Thu, 9 Aug 2018 07:45:30 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 367EB21C69 Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=linuxfoundation.org Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=linux-kernel-owner@vger.kernel.org Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1728709AbeHIKJC (ORCPT ); Thu, 9 Aug 2018 06:09:02 -0400 Received: from mail.linuxfoundation.org ([140.211.169.12]:50728 "EHLO mail.linuxfoundation.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1727371AbeHIKJC (ORCPT ); Thu, 9 Aug 2018 06:09:02 -0400 Received: from localhost (unknown [194.244.16.108]) by mail.linuxfoundation.org (Postfix) with ESMTPSA id 40DE9898; Thu, 9 Aug 2018 07:45:26 +0000 (UTC) Date: Thu, 9 Aug 2018 09:45:23 +0200 From: Greg KH To: Matthew Wilcox Cc: Dave Chinner , Michal Hocko , Kirill Tkhai , akpm@linux-foundation.org, rafael@kernel.org, viro@zeniv.linux.org.uk, darrick.wong@oracle.com, paulmck@linux.vnet.ibm.com, josh@joshtriplett.org, rostedt@goodmis.org, mathieu.desnoyers@efficios.com, jiangshanlai@gmail.com, hughd@google.com, shuah@kernel.org, robh@kernel.org, ulf.hansson@linaro.org, aspriel@gmail.com, vivek.gautam@codeaurora.org, robin.murphy@arm.com, joe@perches.com, heikki.krogerus@linux.intel.com, sfr@canb.auug.org.au, vdavydov.dev@gmail.com, chris@chris-wilson.co.uk, penguin-kernel@I-love.SAKURA.ne.jp, aryabinin@virtuozzo.com, ying.huang@intel.com, shakeelb@google.com, jbacik@fb.com, mingo@kernel.org, mhiramat@kernel.org, linux-kernel@vger.kernel.org, linux-fsdevel@vger.kernel.org, linux-mm@kvack.org Subject: Re: [PATCH RFC 01/10] rcu: Make CONFIG_SRCU unconditionally enabled Message-ID: <20180809074523.GA16149@kroah.com> References: <153365347929.19074.12509495712735843805.stgit@localhost.localdomain> <153365625652.19074.8434946780002619802.stgit@localhost.localdomain> <20180808072040.GC27972@dhcp22.suse.cz> <20180808102734.GH27972@dhcp22.suse.cz> <20180808213125.GM2234@dastard> <20180809000708.GA5566@bombadil.infradead.org> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20180809000708.GA5566@bombadil.infradead.org> User-Agent: Mutt/1.10.1 (2018-07-13) Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Wed, Aug 08, 2018 at 05:07:08PM -0700, Matthew Wilcox wrote: > On Thu, Aug 09, 2018 at 07:31:25AM +1000, Dave Chinner wrote: > > IMO, we've had enough recent bugs to deal with from shrinkers being > > called before the filesystem is set up and from trying to handle > > allocation errors during setup. Do we really want to make shrinker > > shutdown just as prone to mismanagement and subtle, hard to hit > > bugs? I don't think we do - unmount is simply not a critical > > performance path. > > It's never been performance critical for me, but I'm not so sure that > there aren't container workloads which unmount filesystems multiple > times per second. What? Why would they do that? Who cares about tear-down speeds? Start up speeds I can kind of understand...