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 7B809C3F2D1 for ; Thu, 5 Mar 2020 01:11:36 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 48FAB2084E for ; Thu, 5 Mar 2020 01:11:36 +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="ll1ti9vC" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1725912AbgCEBLc (ORCPT ); Wed, 4 Mar 2020 20:11:32 -0500 Received: from bombadil.infradead.org ([198.137.202.133]:60210 "EHLO bombadil.infradead.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1725777AbgCEBLc (ORCPT ); Wed, 4 Mar 2020 20:11:32 -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=ATYs8WYSob7D1uXHAGhQnBidHLKqyWEDLWJr1UpmKBE=; b=ll1ti9vCegEMDvTIpAlQjfhWcy MZN6xKgVwk7FRgVb01kIYw1Z2eYvESC3SsJXbNbhnLvp3lul+YMfFlyTwo6QqsV7RCSeg82/kVpg9 MA7W4YrtBeORJ00RzwBr9DmDgpj7DieDkbkDb2hOzC5F1QkikHrMcWrEAw3sEV8ej4KNiUot4mkui 6wa8XEgQpZb2fA39Fg6Uj6MIpRCS8UBSSGpYzO78jP1Gt77Ox05MmxlNjyuLfXc8KjwOMlRStu+2k K1WFHIC1XPPGeBiXEien2FgMZQF6ykj394QpgZVr6xRbKC78AX1mNrDJr7vzOLTmhHzs6+lJ1Lvfk vH8ZvgAw==; Received: from willy by bombadil.infradead.org with local (Exim 4.92.3 #3 (Red Hat Linux)) id 1j9f2p-0002to-8m; Thu, 05 Mar 2020 01:11:23 +0000 Date: Wed, 4 Mar 2020 17:11:23 -0800 From: Matthew Wilcox To: Al Viro Cc: Aleksa Sarai , "Eric W. Biederman" , Linus Torvalds , linux-fsdevel , Linux Kernel Mailing List Subject: Re: [RFC][PATCHSET] sanitized pathwalk machinery (v3) Message-ID: <20200305011123.GL29971@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> <20200304105946.4xseo3jokcnpptrj@yavin> <20200304210031.GT23230@ZenIV.linux.org.uk> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20200304210031.GT23230@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 09:00:31PM +0000, Al Viro wrote: > On Wed, Mar 04, 2020 at 09:59:46PM +1100, Aleksa Sarai wrote: > > > > 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. > > > > I won't be at LSF unfortunately, but this is something I would be very > > interested in helping with -- one of the things I've noticed is the lack > > of a test-suite for some of the more generic VFS bits (such as namei). > > BTW, has anyone tried to run tests with oprofile and see how much of the > core kernel gets exercised? That looks like an obvious thing to try - > at least the places outside of spin_lock_irq() ought to get lit after > a while... > > Have any CI folks tried doing that, or am I missing some obvious reason > why that is not feasible? I don't know about oprofile, but LTP got their gcov patches merged into 2.6.31: http://ltp.sourceforge.net/coverage/gcov.php