From mboxrd@z Thu Jan  1 00:00:00 1970
Return-Path: <linux-kernel-owner@vger.kernel.org>
Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand
        id S1164366AbdDXCsU (ORCPT <rfc822;w@1wt.eu>);
        Sun, 23 Apr 2017 22:48:20 -0400
Received: from mout.gmx.net ([212.227.17.21]:50175 "EHLO mout.gmx.net"
        rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP
        id S1164240AbdDXCsO (ORCPT <rfc822;linux-kernel@vger.kernel.org>);
        Sun, 23 Apr 2017 22:48:14 -0400
Message-ID: <1493002089.4145.7.camel@gmx.de>
Subject: TREE_SRCU slows hotplug by factor ~16
From: Mike Galbraith <efault@gmx.de>
To: "Paul E. McKenney" <paulmck@linux.vnet.ibm.com>
Cc: LKML <linux-kernel@vger.kernel.org>
Date: Mon, 24 Apr 2017 04:48:09 +0200
Content-Type: text/plain; charset="UTF-8"
X-Mailer: Evolution 3.16.5 
Mime-Version: 1.0
Content-Transfer-Encoding: 7bit
X-Provags-ID: V03:K0:aimPYhv1U6jpdqfs82tY020guF1s1GNibw2XKizEsmTuHIAn/X2
 5xMHziZFQtEqivMtmB5jIYavw6VTAaXzPuBFQrvHJ/BOuda47Nuu3z/wFt6eam9S8gD2jne
 sxkgsVXzw4rudvCwEnPSZtaLa/yG9KlsUxFaeDSFZwTrUm7pRxlE3/OgA5ybnoTRYUkwW+l
 +2ufHIkeH7+Nl2xUOJkag==
X-UI-Out-Filterresults: notjunk:1;V01:K0:IYX9g22S22k=:/QO0Pc1ufO9kZO9D0dANVO
 B5ub1xrdzG2CIU9NPU5HWBeJXZZrxFhMFy1J05D1ZxpZ1gt2rgjty6uGYMpr4P9FUZPh88NTC
 NjUCOGSWf4rLwsv+FexkkaI/wQIwbGCo8i9kyV2gdyldtLkRfXxvmhMMzKTTgA8CxuhmIhVmM
 OPHG4CL75gVBPKP9dEthgJlrSJbL8ZR4VgNeEZuqKxqgrXeD1maCLDjJU1PriWmLENvPg7hp/
 zPvsL5n2dSBb6dBR5Mhzv4EQjQzZL6Hr/ApDhOQhyCuHoVALxGGncxHAlhEvz4j9u8ZfHUp9F
 MSkooqJOAc8jjIwMqnzV5olF/mbsotK3Vav5yyJjNyKrge5PblYmR2IzzfPs2A+PIdPPZudC2
 NEO5WUhhvOiVSXTATba5omKMEimzULNncfFfbTM/Q0UyKzjIspRerneg7VhV69AntXr6vCGc/
 MWApRbPzv4i8yq6makwYcHRxCwwe31tZVnDIWCHSeyjvn9wrt5OuqUImia7q3R+O/kQHdqfHK
 rYhqg1SWnCLfdGIHphwj8AVms3qL7SfHCCS6LbiI4dN6bQFuFTt3/26kPUZf+AsuCO9ZzwuGJ
 gt9g52DHoUez3AoxiXptQtPNxZKL1pyJo2/2oGb/9gl0FzVY6c6JTFP9QodI+f8VPYaImWgAl
 jb0Cz6H3D9GFn3fJEpA/LIn3/ZMHGs1nF+Ly1Ih3qrohS5U2kVL5N1Qj8En18ZDV47blk4y62
 fkm5UYI23VE5/7SeCx9QHyWgrO9DhCOUMQXQiUXCWLzoxORMvsb210zOYuAKVIpnn0mtgXF2+
 zGnl3DO
Sender: linux-kernel-owner@vger.kernel.org
List-ID: <linux-kernel.vger.kernel.org>
X-Mailing-List: linux-kernel@vger.kernel.org

Greetings,

Running Steven's hotplug stress script in tip w. CLASSIC_SRCU takes 55s
in my i4790 box, whereas TREE_SRCU takes over 16m.  (Master with the
same config does it in 39s.. but then lockdep isn't enabled in master)

	-Mike