linux-kernel - RE: [Linux-nvdimm] [GIT PULL] PMEM driver for v4.1

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Message-ID: <94D0CD8314A33A4D9D801C0FE68B40295A8AA0F6@G9W0745.americas.hpqcorp.net>
Date:	Tue, 14 Apr 2015 21:46:19 +0000
From:	"Elliott, Robert (Server Storage)" <Elliott@...com>
To:	Dan Williams <dan.j.williams@...el.com>
CC:	Ingo Molnar <mingo@...nel.org>, Christoph Hellwig <hch@....de>,
	"Matthew Wilcox" <matthew.r.wilcox@...el.com>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-nvdimm@...ts.01.org" <linux-nvdimm@...ts.01.org>,
	"Kani, Toshimitsu" <toshi.kani@...com>
Subject: RE: [Linux-nvdimm] [GIT PULL] PMEM driver for v4.1


> -----Original Message-----
> From: Dan Williams [mailto:dan.j.williams@...el.com]
> Sent: Tuesday, April 14, 2015 11:34 AM
> To: Elliott, Robert (Server Storage)
> > ...
> >> Since it's directly mapped it should just work for most things if it's
> >> at least write-through cached (UC would be a horror), and it would
> >> also solve all the size problems. With write-through caching it should
> >> also be pretty OK performance-wise. The 64 bytes size is ideal as
> >
> > Are the WT support patches going to make it into 4.1?
> 
> Which patches are these?  Maybe I missed them, but I don't see
> anything in the archives.

These have been baking in linux-mm and linux-next:
* [PATCH v3 0/6] Kernel huge I/O mapping support
  https://lkml.org/lkml/2015/3/3/589
* [PATCH v4 0/7] mtrr, mm, x86: Enhance MTRR checks for huge I/O mapping
  https://lkml.org/lkml/2015/3/24/1056

I don't think this made it into a subsystem tree yet:
* [PATCH v8 0/7] Support Write-Through mapping on x86 
  https://lkml.org/lkml/2015/2/24/773

I guess we could target 4.2 for both the WT series and
pmem patches that support the new ioremap_wt() function.

---
Robert Elliott, HP Server Storage