From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751933AbbFBUCF (ORCPT ); Tue, 2 Jun 2015 16:02:05 -0400 Received: from cantor2.suse.de ([195.135.220.15]:56523 "EHLO mx2.suse.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751122AbbFBUB4 (ORCPT ); Tue, 2 Jun 2015 16:01:56 -0400 Date: Tue, 2 Jun 2015 22:01:53 +0200 From: "Luis R. Rodriguez" To: Andy Lutomirski , linux-rdma@vger.kernel.org, "Marciniszyn, Mike" , Doug Ledford , roland@purestorage.com Cc: Toshi Kani , Borislav Petkov , "H. Peter Anvin" , Thomas Gleixner , Ingo Molnar , Andrew Morton , Arnd Bergmann , "linux-mm@kvack.org" , "linux-kernel@vger.kernel.org" , X86 ML , linux-nvdimm , Juergen Gross , Stefan Bader , Henrique de Moraes Holschuh , Yigal Korman , Konrad Rzeszutek Wilk , "Elliott, Robert (Server Storage)" , Christoph Hellwig Subject: Re: [PATCH v12 0/10] Support Write-Through mapping on x86 Message-ID: <20150602200153.GN23057@wotan.suse.de> References: <1433187393-22688-1-git-send-email-toshi.kani@hp.com> <20150602162103.GL23057@wotan.suse.de> <1433270808.23540.155.camel@misato.fc.hp.com> <20150602194354.GM23057@wotan.suse.de> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: User-Agent: Mutt/1.5.21 (2010-09-15) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Tue, Jun 02, 2015 at 12:50:09PM -0700, Andy Lutomirski wrote: > On Tue, Jun 2, 2015 at 12:43 PM, Luis R. Rodriguez wrote: > > On Tue, Jun 02, 2015 at 12:46:48PM -0600, Toshi Kani wrote: > >> On Tue, 2015-06-02 at 18:21 +0200, Luis R. Rodriguez wrote: > >> > On Mon, Jun 01, 2015 at 01:36:23PM -0600, Toshi Kani wrote: > >> > > This patchset adds support of Write-Through (WT) mapping on x86. > >> > > The study below shows that using WT mapping may be useful for > >> > > non-volatile memory. > >> > > > >> > > http://www.hpl.hp.com/techreports/2012/HPL-2012-236.pdf > >> > > > >> > > The patchset consists of the following changes. > >> > > - Patch 1/10 to 6/10 add ioremap_wt() > >> > > - Patch 7/10 adds pgprot_writethrough() > >> > > - Patch 8/10 to 9/10 add set_memory_wt() > >> > > - Patch 10/10 changes the pmem driver to call ioremap_wt() > >> > > > >> > > All new/modified interfaces have been tested. > >> > > > >> > > The patchset is based on: > >> > > git://git.kernel.org/pub/scm/linux/kernel/git/bp/bp.git#tip-mm-2 > >> > > >> > While at it can you also look at: > >> > > >> > mcgrof@ergon ~/linux-next (git::master)$ git grep -4 "writethrough" drivers/infiniband/ > >> > >> Thanks for checking this. The inifiniband driver uses WT mappings on > >> powerpc without proper WT interfaces defined. > > > > Right. > > > >> They can be cleaned up by > >> a separate patch series to support WT on powerpc in the same way after > >> this patchset (support WT on x86) is settled. > > > > Who's gonna do that work though? How much work is it ? Is it too much to ask > > to roll it in this series? > > > > I think the driver maintainers should do it. For all I know, > something will go horribly wrong if those drivers suddenly start using > WT on x86. OK. Letting qib driver folks know. Luis