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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 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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