linux-kernel - Re: [PATCH v12 0/10] Support Write-Through mapping on x86

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Message-ID: <20150602194354.GM23057@wotan.suse.de>
Date:	Tue, 2 Jun 2015 21:43:54 +0200
From:	"Luis R. Rodriguez" <mcgrof@...e.com>
To:	Toshi Kani <toshi.kani@...com>
Cc:	bp@...en8.de, hpa@...or.com, tglx@...utronix.de, mingo@...hat.com,
	akpm@...ux-foundation.org, arnd@...db.de, linux-mm@...ck.org,
	linux-kernel@...r.kernel.org, x86@...nel.org,
	linux-nvdimm@...ts.01.org, jgross@...e.com,
	stefan.bader@...onical.com, luto@...capital.net, hmh@....eng.br,
	yigal@...xistor.com, konrad.wilk@...cle.com, Elliott@...com,
	hch@....de
Subject: Re: [PATCH v12 0/10] Support Write-Through mapping on x86

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@...on ~/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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