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=-1.1 required=3.0 tests=DKIM_SIGNED,DKIM_VALID, DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SPF_PASS, URIBL_BLOCKED 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 35899C46471 for ; Wed, 8 Aug 2018 01:08:33 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id D82B721706 for ; Wed, 8 Aug 2018 01:08:32 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=canb.auug.org.au header.i=@canb.auug.org.au header.b="u+MLSEI/" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org D82B721706 Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=canb.auug.org.au 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 S1726931AbeHHDZe (ORCPT ); Tue, 7 Aug 2018 23:25:34 -0400 Received: from ozlabs.org ([203.11.71.1]:39809 "EHLO ozlabs.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726258AbeHHDZe (ORCPT ); Tue, 7 Aug 2018 23:25:34 -0400 Received: from authenticated.ozlabs.org (localhost [127.0.0.1]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by ozlabs.org (Postfix) with ESMTPSA id 41lYDD06Gfz9s7c; Wed, 8 Aug 2018 11:08:28 +1000 (AEST) Authentication-Results: ozlabs.org; dmarc=none (p=none dis=none) header.from=canb.auug.org.au DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=canb.auug.org.au; s=201702; t=1533690508; bh=mkyEbUMdNLpRxlcL9jwEfnIGxZ7UEmGRVe+s/vO3D/M=; h=Date:From:To:Cc:Subject:In-Reply-To:References:From; b=u+MLSEI/mrL4nHJs7oMVfVS1JvufsWVYrCaqhUwvhqB226hs5h6Ys1NVM7Qq3o8Sc Sr3+4p/0TidbIcNPsEhIVEKnZMi8G8IbIPtYHuFr4ghLELfujdE/HA0Xn8chNte/FL 7U5amLr9wTK+6RHnPwy2F9ONaa5gZFHhUMBUkneu/scOSrdlXrgexO4egAj1ngp0us l2hoBCbNMiV+JV4U+1CJy1SqPL8n1cnKfOf01YIsunZTeQDYBlVtHRTgchrjfLKYat IplxrwSmyhyHmu4PtWoDzvmgB2XRWUfXNQ+n3fk+3LR9ma4+Xyf9LJ6WzNwGESYnX1 sPR+sy0M5fxaA== Date: Wed, 8 Aug 2018 11:08:27 +1000 From: Stephen Rothwell To: Kirill Tkhai Cc: akpm@linux-foundation.org, gregkh@linuxfoundation.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, vdavydov.dev@gmail.com, mhocko@suse.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: <20180808110827.65631461@canb.auug.org.au> In-Reply-To: <153365625652.19074.8434946780002619802.stgit@localhost.localdomain> References: <153365347929.19074.12509495712735843805.stgit@localhost.localdomain> <153365625652.19074.8434946780002619802.stgit@localhost.localdomain> MIME-Version: 1.0 Content-Type: multipart/signed; micalg=pgp-sha256; boundary="Sig_//wODAd0V11DVLAu0Qy+Ta_s"; protocol="application/pgp-signature" Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org --Sig_//wODAd0V11DVLAu0Qy+Ta_s Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: quoted-printable Hi Kirill, On Tue, 07 Aug 2018 18:37:36 +0300 Kirill Tkhai wrot= e: > > This patch kills all CONFIG_SRCU defines and > the code under !CONFIG_SRCU. >=20 > Signed-off-by: Kirill Tkhai So what sort of overheads (in terms of code size and performance) are we adding by having SRCU enabled where it used not to be? --=20 Cheers, Stephen Rothwell --Sig_//wODAd0V11DVLAu0Qy+Ta_s Content-Type: application/pgp-signature Content-Description: OpenPGP digital signature -----BEGIN PGP SIGNATURE----- iQEzBAEBCAAdFiEENIC96giZ81tWdLgKAVBC80lX0GwFAltqQosACgkQAVBC80lX 0GxHGwgAjVnIoT20e4JSYycGiEqHHa55yGjv5LKngiTucYPHmJ31bMFrkK3RVd7s r6M6RVXSQVA21k/Vy8hPV0q+sHChA38xfCx0ZebSrsGfpzy3x/5lgGBUNLZmEoW1 bsYT5/XV6AUM1bWbmO+llnIC4LSL4dN+RMYngElcto8++M6E5YG+5YGCNs+wcrKu Xg5jSShO/G2U0nRMENEeXexcMeRfShGpAeejrZScad23wkkx+TJ+O1lw1ln6afdv c2PRz3pEYmWINiCjZNEwOz1NGsjmHh8IgWnfP3rNID4iq1Gw+3cxO5L+cfX9vCzv jhofBYIo7A5Yf3dmGUvsKTqx7SsuLA== =4lXj -----END PGP SIGNATURE----- --Sig_//wODAd0V11DVLAu0Qy+Ta_s--