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From: Ingo Molnar <mingo@kernel.org>
To: Andy Lutomirski <luto@amacapital.net>
Cc: "Elliott, Robert (Server Storage)" <Elliott@hp.com>,
	Dan Williams <dan.j.williams@intel.com>,
	"Kani, Toshimitsu" <toshi.kani@hp.com>,
	Borislav Petkov <bp@alien8.de>,
	Ross Zwisler <ross.zwisler@linux.intel.com>,
	"H. Peter Anvin" <hpa@zytor.com>,
	Thomas Gleixner <tglx@linutronix.de>,
	Ingo Molnar <mingo@redhat.com>,
	Andrew Morton <akpm@linux-foundation.org>,
	Arnd Bergmann <arnd@arndb.de>,
	"linux-mm@kvack.org" <linux-mm@kvack.org>,
	"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
	X86 ML <x86@kernel.org>,
	"linux-nvdimm@lists.01.org" <linux-nvdimm@lists.01.org>,
	Juergen Gross <jgross@suse.com>,
	Stefan Bader <stefan.bader@canonical.com>,
	Henrique de Moraes Holschuh <hmh@hmh.eng.br>,
	Yigal Korman <yigal@plexistor.com>,
	Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>,
	Luis Rodriguez <mcgrof@suse.com>, Christoph Hellwig <hch@lst.de>,
	Matthew Wilcox <willy@linux.intel.com>
Subject: Re: [PATCH v10 12/12] drivers/block/pmem: Map NVDIMM with ioremap_wt()
Date: Mon, 1 Jun 2015 10:58:21 +0200	[thread overview]
Message-ID: <20150601085821.GA15014@gmail.com> (raw)
In-Reply-To: <CALCETrXhNsk9yX=gerxqHCR6+CLdCGrjt9pDk98yeF0L7yyPvg@mail.gmail.com>


* Andy Lutomirski <luto@amacapital.net> wrote:

> You answered the wrong question. :) I understand the point of the non-temporal 
> stores -- I don't understand the point of using non-temporal stores to *WB 
> memory*.  I think we should be okay with having the kernel mapping use WT 
> instead.

WB memory is write-through, but they are still fully cached for reads.

So non-temporal instructions influence how the CPU will allocate (or not allocate) 
WT cache lines.

Thanks,

	Ingo

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  parent reply	other threads:[~2015-06-01  8:58 UTC|newest]

Thread overview: 33+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2015-05-27 15:18 [PATCH v10 0/12] Support Write-Through mapping on x86 Toshi Kani
2015-05-27 15:18 ` [PATCH v10 1/12] x86, mm, pat: Set WT to PA7 slot of PAT MSR Toshi Kani
2015-05-27 15:18 ` [PATCH v10 2/12] x86, mm, pat: Change reserve_memtype() for WT Toshi Kani
2015-05-27 15:18 ` [PATCH v10 3/12] x86, asm: Change is_new_memtype_allowed() " Toshi Kani
2015-05-27 15:18 ` [PATCH v10 4/12] x86, mm, asm-gen: Add ioremap_wt() " Toshi Kani
2015-05-27 15:18 ` [PATCH v10 5/12] arch/*/asm/io.h: Add ioremap_wt() to all architectures Toshi Kani
2015-05-27 15:18 ` [PATCH v10 6/12] video/fbdev, asm/io.h: Remove ioremap_writethrough() Toshi Kani
2015-05-27 15:18 ` [PATCH v10 7/12] x86, mm, pat: Add pgprot_writethrough() for WT Toshi Kani
2015-05-27 15:19 ` [PATCH v10 8/12] x86, mm, asm: Add WT support to set_page_memtype() Toshi Kani
2015-05-27 15:19 ` [PATCH v10 9/12] x86, mm: Add set_memory_wt() for WT Toshi Kani
2015-05-27 15:19 ` [PATCH v10 10/12] x86, mm, pat: Cleanup init flags in pat_init() Toshi Kani
2015-05-29  8:59   ` Borislav Petkov
2015-05-27 15:19 ` [PATCH v10 11/12] x86, mm, pat: Refactor !pat_enabled handling Toshi Kani
2015-05-29  8:58   ` Borislav Petkov
2015-05-29 14:27     ` Toshi Kani
2015-05-29 15:13       ` Borislav Petkov
2015-05-29 15:17         ` Toshi Kani
2015-05-27 15:19 ` [PATCH v10 12/12] drivers/block/pmem: Map NVDIMM with ioremap_wt() Toshi Kani
2015-05-29  9:11   ` Borislav Petkov
2015-05-29 14:43     ` Dan Williams
2015-05-29 15:03       ` Toshi Kani
2015-05-29 18:19         ` Dan Williams
2015-05-29 18:32           ` Toshi Kani
2015-05-29 19:34             ` Dan Williams
2015-05-29 20:10               ` Toshi Kani
2015-05-29 18:34           ` Andy Lutomirski
2015-05-29 19:32             ` Dan Williams
2015-05-29 21:29             ` Elliott, Robert (Server Storage)
2015-05-29 21:46               ` Andy Lutomirski
2015-05-29 22:24                 ` Elliott, Robert (Server Storage)
2015-05-29 22:32                 ` H. Peter Anvin
2015-06-01  8:58                 ` Ingo Molnar [this message]
2015-06-01 17:10                   ` Andy Lutomirski

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