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=-2.6 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS, USER_AGENT_SANE_1 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 89D9BC34050 for ; Wed, 19 Feb 2020 14:38:29 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 633B624672 for ; Wed, 19 Feb 2020 14:38:29 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1582123109; bh=HauU2E6vMZvOIftkb+sLfl+I2fVaQF5GzaP9mFZhmK8=; h=Date:From:To:Subject:References:In-Reply-To:List-ID:From; b=DSMDk/Yt7lja84RJ7LVxPsGK1cAuDtir+hUcuj62jk3zgHfNg6Ra7yRUP7cHvUhUO PgC41lmVNbKJ255JA9B0FbyBNWSTImMYVoVjC6GRKLMYUQg+IDGMEWC0PMmu/GdhLd jQYJ3dt8g46O3WOhGA/s3DzvP0nDhg8eHY3uugLM= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726677AbgBSOi2 (ORCPT ); Wed, 19 Feb 2020 09:38:28 -0500 Received: from mail-pj1-f48.google.com ([209.85.216.48]:52071 "EHLO mail-pj1-f48.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726672AbgBSOi2 (ORCPT ); Wed, 19 Feb 2020 09:38:28 -0500 Received: by mail-pj1-f48.google.com with SMTP id fa20so168615pjb.1 for ; Wed, 19 Feb 2020 06:38:27 -0800 (PST) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:date:from:to:subject:message-id:references :mime-version:content-disposition:in-reply-to:user-agent; bh=72WkHNZNBug+h8xnQErZ09ASCGeIduOZsTbS42xwNo8=; b=LKFrFCt4iFIXdX9dyC69SQ1J2d1E+E6jgxJQEGzvonIcuiOYkcjFEmCBeFz5gZrvv+ OMXGE1kPJJmkw9fwmzFYANtZ77Mpp+2sulp7dmvidO4BVCs5owyGaSy0kPNgxgKVmaB/ 6udmQswVluNd9EcQg3O+YOQ0hBeRxGtHcfvmuOav8JIEpn5sD0ilGq847+yJsIC8yd0m Cj0buda+wDxtxCvARoVyh/vL8QvV3XdfxhQncE3lAmXZWQ1fXn3xm3TTD/PBRPwuu8T9 VHraIDhDFC40T/MVFNr+USFQik5dn2laOpLVqRQXnUrQ4PHkIDzirLqkB9ahjjghE9/b Du3A== X-Gm-Message-State: APjAAAUkEHo1LI4CJZfI+3/xpxHGW3i+D8GvS8huDCRRAIyWBKZepDRG 9dHsgx1ElD15HkoSmsc4aDQ= X-Google-Smtp-Source: APXvYqwKUrLByyjeDu8w3vggFrqS0WOYuHDGvo2J2iAO07KfjwzEb8qyASxqaYm1DjR72zAEwjj1oA== X-Received: by 2002:a17:902:bf41:: with SMTP id u1mr25796854pls.207.1582123106607; Wed, 19 Feb 2020 06:38:26 -0800 (PST) Received: from 42.do-not-panic.com (42.do-not-panic.com. [157.230.128.187]) by smtp.gmail.com with ESMTPSA id g21sm3651679pfb.126.2020.02.19.06.38.25 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 19 Feb 2020 06:38:25 -0800 (PST) Received: by 42.do-not-panic.com (Postfix, from userid 1000) id 91334402D7; Wed, 19 Feb 2020 14:38:24 +0000 (UTC) Date: Wed, 19 Feb 2020 14:38:24 +0000 From: Luis Chamberlain To: Richard Wareing , linux-xfs@vger.kernel.org, Anthony Iliopoulos Subject: Re: Modern uses of CONFIG_XFS_RT Message-ID: <20200219143824.GR11244@42.do-not-panic.com> References: <20200219135715.GZ30113@42.do-not-panic.com> <20200219143227.aavgzkbuazttpwky@andromeda> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20200219143227.aavgzkbuazttpwky@andromeda> User-Agent: Mutt/1.10.1 (2018-07-13) Sender: linux-xfs-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-xfs@vger.kernel.org On Wed, Feb 19, 2020 at 03:32:27PM +0100, Carlos Maiolino wrote: > On Wed, Feb 19, 2020 at 01:57:15PM +0000, Luis Chamberlain wrote: > > I hear some folks still use CONFIG_XFS_RT, I was curious what was the > > actual modern typical use case for it. I thought this was somewhat > > realted to DAX use but upon a quick code inspection I see direct > > realtionship. > > Hm, not sure if there is any other use other than it's original purpose of > reducing latency jitters. Also XFS_RT dates way back from the day DAX was even a > thing. But anyway, I don't have much experience using XFS_RT by myself, and I > probably raised more questions than answers to yours :P What about another question, this would certainly drive the users out of the corners: can we remove it upstream? Luis