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=-10.3 required=3.0 tests=BAYES_00, HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,MENTIONS_GIT_HOSTING, SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED,USER_AGENT_SANE_1 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 BF417C433ED for ; Tue, 11 May 2021 12:46:38 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 93CEA61042 for ; Tue, 11 May 2021 12:46:38 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S231665AbhEKMrm (ORCPT ); Tue, 11 May 2021 08:47:42 -0400 Received: from mx2.suse.de ([195.135.220.15]:39460 "EHLO mx2.suse.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S231645AbhEKMrk (ORCPT ); Tue, 11 May 2021 08:47:40 -0400 X-Virus-Scanned: by amavisd-new at test-mx.suse.de Received: from relay2.suse.de (unknown [195.135.221.27]) by mx2.suse.de (Postfix) with ESMTP id D5014AF3E; Tue, 11 May 2021 12:46:32 +0000 (UTC) Received: by quack2.suse.cz (Postfix, from userid 1000) id 59D211F2B6D; Tue, 11 May 2021 14:46:32 +0200 (CEST) Date: Tue, 11 May 2021 14:46:32 +0200 From: Jan Kara To: Amir Goldstein Cc: kernel test robot , Jan Kara , LKML , lkp@lists.01.org, kbuild test robot , ying.huang@intel.com, feng.tang@intel.com, zhengjun.xing@intel.com, Matthew Bobrowski Subject: Re: [fanotify] 7cea2a3c50: stress-ng.fanotify.ops_per_sec -23.4% regression Message-ID: <20210511124632.GL24154@quack2.suse.cz> References: <20210511070805.GE8539@xsang-OptiPlex-9020> 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) Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Tue 11-05-21 14:13:38, Amir Goldstein wrote: > On Tue, May 11, 2021 at 9:51 AM kernel test robot wrote: > > > > > > > > Greeting, > > > > FYI, we noticed a -23.4% regression of stress-ng.fanotify.ops_per_sec due to commit: > > > > > > commit: 7cea2a3c505e87a9d6afc78be4a7f7be636a73a7 ("fanotify: support limited functionality for unprivileged users") > > https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git master > > > > I am not sure how this is possible. > This commit only changes permissions to perform the operation. > Is the test not being run as root? Yeah, I've stared at it for some time and didn't come up with a sensible explanation either. I guess we need to try to reproduce and see... Honza -- Jan Kara SUSE Labs, CR