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_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 629F9C43441 for ; Wed, 14 Nov 2018 15:18:49 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 1C4BC208E7 for ; Wed, 14 Nov 2018 15:18:49 +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="OHkBdRbo" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 1C4BC208E7 Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=infradead.org Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=linux-block-owner@vger.kernel.org Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1732914AbeKOBW1 (ORCPT ); Wed, 14 Nov 2018 20:22:27 -0500 Received: from bombadil.infradead.org ([198.137.202.133]:42888 "EHLO bombadil.infradead.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1732485AbeKOBW1 (ORCPT ); Wed, 14 Nov 2018 20:22:27 -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: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=PxQ3y8Fi+lTMVMPmyHgv4V+35r7gI90bPqY17fCU8ac=; b=OHkBdRbo1gRBBXsT//ovB3fXj TdWThR3l+/u6gVHxzGvOdLlYHncbOrgwipqZDBfwEsKb7U1rT7lIUkEWzAaFFfgyZe9li8IJMyk7D t99kqTDhBgYsD6mM9MSoQOtq19wNtYoetpwRQr1nn7VU12/p4GV8pl3tCFBEfExWlMiN57Pv7iI5K iTd/BXSQnkp4Xz4HA5MTiTrhd9JX3vxc/Fw4NWye9DiIkxceqK4PC9x6RQ/JSO3r9aqM808ySz9A6 AMt5m+qASNWGkYMAuKG82cELqAGdB24DZVSfTsG82r4RJoY2xFz5I97d4K59syNcPVykD4cRNA54i UT7wBtIzQ==; Received: from hch by bombadil.infradead.org with local (Exim 4.90_1 #2 (Red Hat Linux)) id 1gMwwK-0005lH-7U; Wed, 14 Nov 2018 15:18:48 +0000 Date: Wed, 14 Nov 2018 07:18:48 -0800 From: Christoph Hellwig To: Mike Snitzer Cc: Christoph Hellwig , Mikulas Patocka , "Alasdair G. Kergon" , dm-devel@redhat.com, linux-block@vger.kernel.org, axboe@kernel.dk Subject: Re: [patch 5/5] block: use a driver-specific handler for the "inflight" value Message-ID: <20181114151848.GA22138@infradead.org> References: <20181106213858.391264280@debian-a64.vm> <20181108145240.GA20087@infradead.org> <20181108170701.GA29107@redhat.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20181108170701.GA29107@redhat.com> 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 Thu, Nov 08, 2018 at 12:07:01PM -0500, Mike Snitzer wrote: > Discussed doing that with Jens and reported as much here: > > https://www.redhat.com/archives/dm-devel/2018-November/msg00068.html > > And Jens gave additional context for why yet another attempt to switch > block core's in_flight to percpu counters is doomed (having already been > proposed and rejected twice): > > https://www.redhat.com/archives/dm-devel/2018-November/msg00071.html > > And yes, definitely should've cc'd linux-block (now added). So how is dm different from the the other 3 handful of drivers using the make_request interface that the per-cpu counters work for dm and not the others?