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=HEADER_FROM_DIFFERENT_DOMAINS, MAILING_LIST_MULTI,SPF_PASS,USER_AGENT_MUTT 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 CC72DC67863 for ; Mon, 22 Oct 2018 09:08:52 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 84BF720779 for ; Mon, 22 Oct 2018 09:08:52 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 84BF720779 Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=lst.de Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=linux-kernel-owner@vger.kernel.org Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1728194AbeJVR03 (ORCPT ); Mon, 22 Oct 2018 13:26:29 -0400 Received: from verein.lst.de ([213.95.11.211]:35130 "EHLO newverein.lst.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1727218AbeJVR03 (ORCPT ); Mon, 22 Oct 2018 13:26:29 -0400 Received: by newverein.lst.de (Postfix, from userid 2407) id 9741168BE1; Mon, 22 Oct 2018 11:08:49 +0200 (CEST) Date: Mon, 22 Oct 2018 11:08:49 +0200 From: Christoph Hellwig To: Ming Lei Cc: Jianchao Wang , axboe@kernel.dk, martin.petersen@oracle.com, tom.leiming@gmail.com, hch@lst.de, linux-block@vger.kernel.org, linux-kernel@vger.kernel.org Subject: Re: [PATCH V2] block: fix the DISCARD request merge Message-ID: <20181022090849.GA19053@lst.de> References: <1540045777-10290-1-git-send-email-jianchao.w.wang@oracle.com> <20181022090601.GA21171@ming.t460p> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20181022090601.GA21171@ming.t460p> User-Agent: Mutt/1.5.17 (2007-11-01) Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Mon, Oct 22, 2018 at 05:06:02PM +0800, Ming Lei wrote: > > The above may be changed to 'if (blk_try_merge(req) == ELEVATOR_DISCARD_MERGE)' > or sort of in future, which may has document benefit at least, since > ELEVATOR_DISCARD_MERGE means multi-segment discard merge. I like that idea, and we should do it for the respin