Date: Tue, 2 Jun 2015 21:43:54 +0200
From: "Luis R. Rodriguez" <mcgrof@suse.com>
To: Toshi Kani <toshi.kani@hp.com>
Cc: bp@alien8.de, hpa@zytor.com, tglx@linutronix.de, mingo@redhat.com,
        akpm@linux-foundation.org, arnd@arndb.de, linux-mm@kvack.org,
        linux-kernel@vger.kernel.org, x86@kernel.org, linux-nvdimm@ml01.01.org,
        jgross@suse.com, stefan.bader@canonical.com, luto@amacapital.net,
        hmh@hmh.eng.br, yigal@plexistor.com, konrad.wilk@oracle.com,
        Elliott@hp.com, hch@lst.de
Subject: Re: [PATCH v12 0/10] Support Write-Through mapping on x86
Message-ID: <20150602194354.GM23057@wotan.suse.de>
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 <20150602162103.GL23057@wotan.suse.de>
 <1433270808.23540.155.camel@misato.fc.hp.com>
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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?

  Luis
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