Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751870AbbFBTul (ORCPT ); Tue, 2 Jun 2015 15:50:41 -0400 Received: from mail-la0-f43.google.com ([209.85.215.43]:35855 "EHLO mail-la0-f43.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751256AbbFBTue (ORCPT ); Tue, 2 Jun 2015 15:50:34 -0400 MIME-Version: 1.0 In-Reply-To: <20150602194354.GM23057@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> From: Andy Lutomirski Date: Tue, 2 Jun 2015 12:50:09 -0700 Message-ID: Subject: Re: [PATCH v12 0/10] Support Write-Through mapping on x86 To: "Luis R. Rodriguez" 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 Content-Type: text/plain; charset=UTF-8 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1892 Lines: 48 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. --Andy -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/