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=-2.3 required=3.0 tests=DKIM_INVALID,DKIM_SIGNED, HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS, USER_AGENT_MUTT autolearn=unavailable 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 8EC5CC04AB4 for ; Tue, 21 May 2019 08:28:54 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 5B3C72173E for ; Tue, 21 May 2019 08:28:54 +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="HBJ7MsNn" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726347AbfEUI2t (ORCPT ); Tue, 21 May 2019 04:28:49 -0400 Received: from bombadil.infradead.org ([198.137.202.133]:43554 "EHLO bombadil.infradead.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726138AbfEUI2t (ORCPT ); Tue, 21 May 2019 04:28:49 -0400 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:Resent-Date: Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:List-Id: List-Help:List-Unsubscribe:List-Subscribe:List-Post:List-Owner:List-Archive; bh=dzgDZjQNK4+WfEDvGGwqugQnmKy730vEONl7eH1nok4=; b=HBJ7MsNn+aPvz98REpWd9DgMm dmnQ22k0MVUdI1ghk5enllEkjxUbxymVaLD7NVE6XpFXuVuv4deanC9rt+7COcMZ/bSTF3cHs6XrG EeZg8OP2FHkZjEbwkKC1aTNGB4Ls0/51AIQzi3f/1Uci5dQ16U1VCCzTGWzYbCKXJmEwGKkHgrvK5 EoXiYMJYKCyp/V8tyOXRvKhNzvYGACLupH4EflRc6z6y3dqh4E2dd9Tw/PbH2SBxltIIjqpv96KkO f46PoXLEVplgIBXtbi95kuZgzMTGZdJsCqab99Yadc2yzaoJ544SH8krtRYiN4SSqSQlm+px8h5ZO VZdh3LauA==; Received: from hch by bombadil.infradead.org with local (Exim 4.90_1 #2 (Red Hat Linux)) id 1hT08c-0005iu-QJ; Tue, 21 May 2019 08:28:46 +0000 Date: Tue, 21 May 2019 01:28:46 -0700 From: 'Christoph Hellwig' To: Jan Kara Cc: 'Christoph Hellwig' , kanchan , linux-kernel@vger.kernel.org, linux-block@vger.kernel.org, linux-nvme@lists.infradead.org, linux-fsdevel@vger.kernel.org, linux-ext4@vger.kernel.org, prakash.v@samsung.com, anshul@samsung.com, "Martin K. Petersen" Subject: Re: [PATCH v5 0/7] Extend write-hint framework, and add write-hint for Ext4 journal Message-ID: <20190521082846.GA11024@infradead.org> References: <1556191202-3245-1-git-send-email-joshi.k@samsung.com> <20190510170249.GA26907@infradead.org> <00fb01d50c71$dd358e50$97a0aaf0$@samsung.com> <20190520142719.GA15705@infradead.org> <20190521082528.GA17709@quack2.suse.cz> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20190521082528.GA17709@quack2.suse.cz> User-Agent: Mutt/1.9.2 (2017-12-15) X-SRS-Rewrite: SMTP reverse-path rewritten from by bombadil.infradead.org. See http://www.infradead.org/rpr.html Sender: linux-block-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-block@vger.kernel.org On Tue, May 21, 2019 at 10:25:28AM +0200, Jan Kara wrote: > performance benefits for some drives. After all you can just think about it > like RWH_WRITE_LIFE_JOURNAL type of hint available for the kernel... Except that it actuallys adds a parallel insfrastructure. A RWH_WRITE_LIFE_JOURNAL would be much more palatable, but someone needs to explain how that is: a) different from RWH_WRITE_LIFE_SHORT b) would not apply to a log/journal maintained in userspace that works exactly the same