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=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,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 689ACC433DF for ; Wed, 24 Jun 2020 13:19:15 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 4124B20720 for ; Wed, 24 Jun 2020 13:19:15 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1593004755; bh=70R5q6Q1p2NaBuBVRtYU1LVGGDAzyP8lP9z31WOzMN4=; h=Date:From:To:Cc:Subject:References:In-Reply-To:List-ID:From; b=MgZSmmVE0850xqWuaDdtyXX8fHGuitCgH4r1NqocrWWBxrjcJlmsQR4YABDq+TCSX EwKB00+wM8VZlGifYuvrwsrGha7towe2sGYkPilwaixv1TvW5QIQtwoTGrD5lVs9BS PkJHrNin3q+8qUqqCF6+fKWqFlD2oZHwr727o0/s= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2389108AbgFXNTO (ORCPT ); Wed, 24 Jun 2020 09:19:14 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:39542 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1728685AbgFXNTM (ORCPT ); Wed, 24 Jun 2020 09:19:12 -0400 Received: from mail-qk1-x742.google.com (mail-qk1-x742.google.com [IPv6:2607:f8b0:4864:20::742]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 378B0C061573; Wed, 24 Jun 2020 06:19:11 -0700 (PDT) Received: by mail-qk1-x742.google.com with SMTP id l17so1707360qki.9; Wed, 24 Jun 2020 06:19:11 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=sender:date:from:to:cc:subject:message-id:references:mime-version :content-disposition:in-reply-to; bh=x9PH2bXbKT4/vlzv/t3aa9HSoEpEteRDNZADkykIJbk=; b=J+rDM/27ebpHPpHj7FAYq7/0qxGqNAbak5b5IF/bxyZLq7iNX2lhgeqXdBt2b/AmBU Xn96KI5GI6lLirjXlQKZ61zDEXxXRgGX7xw6utBMFxaNYcfRgN6qy+YTiAF24QBLn1Oy 2KonAUUiFT3Temc1ZAykdeGlx+cscnEEbiCoA/POjRoINkkP5f5ZzxVLSjv2EzuhOtH4 qZgK62n5YSMNnmfBTG1GkejeSpd7v88TAYiSQULdg3F3NMijoLcRiFPikv0Gj9Rx9rqr W7KWcCyiJhphbawLZo3m8ZceCHYDQqgjaXKE21KAQROnIDi5g/RCHFke+yAl9CaSrU2y j3Mw== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:sender:date:from:to:cc:subject:message-id :references:mime-version:content-disposition:in-reply-to; bh=x9PH2bXbKT4/vlzv/t3aa9HSoEpEteRDNZADkykIJbk=; b=l2qG0PicTU6kxIvvM/c528YL/vkVWFwqW7B88YU3GAZFOygwsFuiMVeJ+j1UbtCttt PYt+i+5Jvx4J/VySc/Roy7LEpRXuRcIV9J2L+xGLBsGZS1KHtFvfLddb649S0OTV9f7t x6fb/8E0fXcMDaQFE/2gYXqmNalhM61yPyj6CBD/d7mRqWWuoJYXMYu7wpc1TuMYkmQ1 LKBxKq2ImYu5kI0abFqhkGpadW0N/0yTbPu8haH4FxezkvOVDgq437OlKdbthOyQ24/s yRjZ2b4OVdF9hy5rUykmBw5uKW1a2yHKFRXinA9q5/RhhkAEVPoxX5BDFVDieKR7QWdn m2/A== X-Gm-Message-State: AOAM530O0DD5RB+2/Wo/nf7yastyFsHT0wojRJpOYlybE6O8eYKET3zB 69Ijt5EUgl15GRZzgVJIM1s= X-Google-Smtp-Source: ABdhPJwgfDfzL4KN09swypIuIKZfgsqYZMxaPOwShr4D1CtwLzc6yPm7uRLlj8lP8jvmUBf2E8jJkg== X-Received: by 2002:a37:649:: with SMTP id 70mr11096963qkg.306.1593004750118; Wed, 24 Jun 2020 06:19:10 -0700 (PDT) Received: from localhost ([2620:10d:c091:480::1:95ca]) by smtp.gmail.com with ESMTPSA id u7sm3207827qku.119.2020.06.24.06.19.09 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 24 Jun 2020 06:19:09 -0700 (PDT) Date: Wed, 24 Jun 2020 09:19:08 -0400 From: Tejun Heo To: Rick Lindsley Cc: Ian Kent , Greg Kroah-Hartman , Stephen Rothwell , Andrew Morton , Al Viro , David Howells , Miklos Szeredi , linux-fsdevel , Kernel Mailing List Subject: Re: [PATCH v2 0/6] kernfs: proposed locking and concurrency improvement Message-ID: <20200624131908.GE13061@mtj.duckdns.org> References: <159237905950.89469.6559073274338175600.stgit@mickey.themaw.net> <20200619153833.GA5749@mtj.thefacebook.com> <16d9d5aa-a996-d41d-cbff-9a5937863893@linux.vnet.ibm.com> <20200619222356.GA13061@mtj.duckdns.org> <20200622175343.GC13061@mtj.duckdns.org> <82b2379e-36d0-22c2-41eb-71571e992b37@linux.vnet.ibm.com> <20200623231348.GD13061@mtj.duckdns.org> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Hello, Rick. On Wed, Jun 24, 2020 at 02:04:15AM -0700, Rick Lindsley wrote: > In contrast, the provided patch fixes the observed problem with no ripple > effect to other subsystems or utilities. > > Greg had suggested > Treat the system as a whole please, don't go for a short-term > fix that we all know is not solving the real problem here. > > Your solution affects multiple subsystems; this one affects one. Which is > the whole system approach in terms of risk? You mentioned you support 30k > scsi disks but only because they are slow so the inefficiencies of kernfs > don't show. That doesn't bother you? I suggest putting honest thoughts into finding a long term solution instead of these rhetorical retorts. If you really can't see how ill-suited the current use of interface and proposed solution is, I'm not sure how better to communicate them to you. Thanks. -- tejun