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=-0.6 required=3.0 tests=DKIM_INVALID,DKIM_SIGNED, HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS autolearn=no 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 B1596C3F2D1 for ; Wed, 4 Mar 2020 13:28:18 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 8286E2166E for ; Wed, 4 Mar 2020 13:28:18 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=fail reason="signature verification failed" (2048-bit key) header.d=infradead.org header.i=@infradead.org header.b="eq5l3g1T" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2388125AbgCDN2R (ORCPT ); Wed, 4 Mar 2020 08:28:17 -0500 Received: from bombadil.infradead.org ([198.137.202.133]:49726 "EHLO bombadil.infradead.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S2387919AbgCDN2R (ORCPT ); Wed, 4 Mar 2020 08:28:17 -0500 DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=infradead.org; s=bombadil.20170209; h=In-Reply-To:Content-Type:MIME-Version :References:Message-ID:Subject:Cc:To:From:Date:Sender:Reply-To: Content-Transfer-Encoding:Content-ID:Content-Description; bh=vcyjl/gf9IB6qjHUL3x/zChqzGCsLcScrsxnmpIoAjU=; b=eq5l3g1Tod0dAnZbI4RkPb4doi 2dFO7PzAPS1zgq9oQM512m58g5Gc2wzNrgvVGouydIulxHhfHCPTP3zUFL6XpoGTDCbdd36NVH3mH 7Au7SnFiEDp1OBbDewb9Da2OEX33OFf0jew/JLvAhHYMNSyHun0llahx5201paync0Ls7pO2YAXgy bypnEAWWHugKhvGwdCWlHORtqxR4QQZkvlv1D7BtmwpnkEt8XTX2h0C8Q9E0dCKF441nkdH2Y+t2B Fxlw32Ip+xO6WguWKS0rTc2zIQLeUCB5QgkVwRTSrkGqv+tXon0u05MLNvPL8nFly6QP827eBzFqu Nb8cv/DQ==; Received: from willy by bombadil.infradead.org with local (Exim 4.92.3 #3 (Red Hat Linux)) id 1j9U4K-0006L0-P1; Wed, 04 Mar 2020 13:28:12 +0000 Date: Wed, 4 Mar 2020 05:28:12 -0800 From: Matthew Wilcox To: Al Viro Cc: "Eric W. Biederman" , Linus Torvalds , linux-fsdevel , Linux Kernel Mailing List Subject: Re: [RFC][PATCHSET] sanitized pathwalk machinery (v3) Message-ID: <20200304132812.GE29971@bombadil.infradead.org> References: <20200223011154.GY23230@ZenIV.linux.org.uk> <20200301215125.GA873525@ZenIV.linux.org.uk> <20200302003926.GM23230@ZenIV.linux.org.uk> <87o8tdgfu8.fsf@x220.int.ebiederm.org> <20200304002434.GO23230@ZenIV.linux.org.uk> <87wo80g0bo.fsf@x220.int.ebiederm.org> <20200304065547.GP23230@ZenIV.linux.org.uk> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20200304065547.GP23230@ZenIV.linux.org.uk> Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Wed, Mar 04, 2020 at 06:55:47AM +0000, Al Viro wrote: > On Tue, Mar 03, 2020 at 11:23:39PM -0600, Eric W. Biederman wrote: > > Do the xfs-tests cover that sort of thing? > > The emphasis is stress testing the filesystem not the VFS but there is a > > lot of overlap between the two. > > I do run xfstests. But "runs in KVM without visible slowdowns" != "won't > cause them on 48-core bare metal". And this area (especially when it > comes to RCU mode) can be, er, interesting in that respect. > > FWIW, I'm putting together some litmus tests for pathwalk semantics - > one of the things I'd like to discuss at LSF; quite a few codepaths > are simply not touched by anything in xfstests. Might be more appropriate for LTP than xfstests? will-it-scale might be the right place for performance benchmarks.