On Tue, Jun 2, 2015 at 12:43 PM, Luis R. Rodriguez <mcgrof@xxxxxxxx> 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, send a message with 'unsubscribe linux-mm' in the body to majordomo@xxxxxxxxx. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: <a href=mailto:"dont@xxxxxxxxx";> email@xxxxxxxxx </a>