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 891C6C46470 for ; Wed, 8 Aug 2018 16:18:14 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 4DE3221723 for ; Wed, 8 Aug 2018 16:18:14 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 4DE3221723 Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=joshtriplett.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 S1728371AbeHHSif (ORCPT ); Wed, 8 Aug 2018 14:38:35 -0400 Received: from mslow2.mail.gandi.net ([217.70.178.242]:58144 "EHLO slow1-d.mail.gandi.net" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1727062AbeHHSif (ORCPT ); Wed, 8 Aug 2018 14:38:35 -0400 Received: from relay7-d.mail.gandi.net (unknown [217.70.183.200]) by slow1-d.mail.gandi.net (Postfix) with ESMTP id 199753A01E6; Wed, 8 Aug 2018 18:13:53 +0200 (CEST) X-Originating-IP: 50.39.174.102 Received: from localhost (50-39-174-102.bvtn.or.frontiernet.net [50.39.174.102]) (Authenticated sender: josh@joshtriplett.org) by relay7-d.mail.gandi.net (Postfix) with ESMTPSA id DF6E52000A; Wed, 8 Aug 2018 16:13:32 +0000 (UTC) Date: Wed, 8 Aug 2018 09:13:30 -0700 From: Josh Triplett To: Kirill Tkhai Cc: Michal Hocko , akpm@linux-foundation.org, gregkh@linuxfoundation.org, rafael@kernel.org, viro@zeniv.linux.org.uk, darrick.wong@oracle.com, paulmck@linux.vnet.ibm.com, 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, willy@infradead.org, 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: <20180808161330.GA22863@localhost> References: <153365347929.19074.12509495712735843805.stgit@localhost.localdomain> <153365625652.19074.8434946780002619802.stgit@localhost.localdomain> <20180808072040.GC27972@dhcp22.suse.cz> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: 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 01:17:44PM +0300, Kirill Tkhai wrote: > On 08.08.2018 10:20, Michal Hocko wrote: > > On Tue 07-08-18 18:37:36, Kirill Tkhai wrote: > >> This patch kills all CONFIG_SRCU defines and > >> the code under !CONFIG_SRCU. > > > > The last time somebody tried to do this there was a pushback due to > > kernel tinyfication. So this should really give some numbers about the > > code size increase. Also why can't we make this depend on MMU. Is > > anybody else than the reclaim asking for unconditional SRCU usage? > > I don't know one. The size numbers (sparc64) are: > > $ size image.srcu.disabled > text data bss dec hex filename > 5117546 8030506 1968104 15116156 e6a77c image.srcu.disabled > $ size image.srcu.enabled > text data bss dec hex filename > 5126175 8064346 1968104 15158625 e74d61 image.srcu.enabled > The difference is: 15158625-15116156 = 42469 ~41Kb 41k is a *substantial* size increase. However, can you compare tinyconfig with and without this patch? That may have a smaller change.