linux-kernel - Re: [PATCH 4/5] x86, mm: Add set_memory

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Message-ID: <CALCETrUrbQm72_U4uGCCdNr1uww0+avmwu2N_tHRcdevRJCyvQ@mail.gmail.com>
Date:	Thu, 4 Sep 2014 12:14:54 -0700
From:	Andy Lutomirski <luto@...capital.net>
To:	Toshi Kani <toshi.kani@...com>
Cc:	"H. Peter Anvin" <hpa@...or.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...hat.com>, akpm@...uxfoundation.org,
	Arnd Bergmann <arnd@...db.de>,
	"linux-mm@...ck.org" <linux-mm@...ck.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Juergen Gross <jgross@...e.com>,
	Stefan Bader <stefan.bader@...onical.com>,
	Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>
Subject: Re: [PATCH 4/5] x86, mm: Add set_memory_wt() for WT

On Thu, Sep 4, 2014 at 11:57 AM, Toshi Kani <toshi.kani@...com> wrote:
> On Thu, 2014-09-04 at 11:57 -0700, Andy Lutomirski wrote:
>> On Thu, Sep 4, 2014 at 11:35 AM, Toshi Kani <toshi.kani@...com> wrote:
>> > This patch adds set_memory_wt(), set_memory_array_wt(), and
>> > set_pages_array_wt() for setting range(s) of memory to WT.
>> >
>>
>> Possibly dumb question: I thought that set_memory_xyz was only for
>> RAM.  Is that incorrect?
>
> It works for non-RAM ranges as well.  For instance, you can use
> set_memory_xyz() to change cache attribute for a non-RAM range mapped by
> ioremap_cache().

OK -- I didn't realize that was legal.

Do you, by any chance, have a test driver for this?  For example,
something that lets your reserve some WT memory at boot and mmap it?
I wouldn't mind getting some benchmarks, and I can even throw it at
the NV-DIMM box that's sitting under my desk :)

--Andy
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