From: Andy Lutomirski <luto@amacapital.net>
To: Toshi Kani <toshi.kani@hp.com>
Cc: "H. Peter Anvin" <hpa@zytor.com>,
Thomas Gleixner <tglx@linutronix.de>,
Ingo Molnar <mingo@redhat.com>,
akpm@linuxfoundation.org, Arnd Bergmann <arnd@arndb.de>,
"linux-mm@kvack.org" <linux-mm@kvack.org>,
"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
Juergen Gross <jgross@suse.com>,
Stefan Bader <stefan.bader@canonical.com>,
Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
Subject: Re: [PATCH 4/5] x86, mm: Add set_memory_wt() for WT
Date: Thu, 4 Sep 2014 12:14:54 -0700 [thread overview]
Message-ID: <CALCETrUrbQm72_U4uGCCdNr1uww0+avmwu2N_tHRcdevRJCyvQ@mail.gmail.com> (raw)
In-Reply-To: <1409857025.28990.125.camel@misato.fc.hp.com>
On Thu, Sep 4, 2014 at 11:57 AM, Toshi Kani <toshi.kani@hp.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@hp.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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next prev parent reply other threads:[~2014-09-04 19:15 UTC|newest]
Thread overview: 35+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-09-04 18:35 [PATCH 0/5] Support Write-Through mapping on x86 Toshi Kani
2014-09-04 18:35 ` [PATCH 1/5] x86, mm, pat: Set WT to PA4 slot of PAT MSR Toshi Kani
2014-09-04 20:11 ` Henrique de Moraes Holschuh
2014-09-04 20:21 ` H. Peter Anvin
2014-09-04 23:19 ` Henrique de Moraes Holschuh
2014-09-04 23:34 ` Andy Lutomirski
2014-09-05 0:29 ` Toshi Kani
2014-09-05 0:51 ` Andy Lutomirski
2014-09-05 14:00 ` Toshi Kani
2014-09-05 15:07 ` H. Peter Anvin
2014-09-05 15:22 ` Toshi Kani
2014-09-05 15:41 ` H. Peter Anvin
2014-09-05 15:42 ` Toshi Kani
2014-09-12 19:25 ` Konrad Rzeszutek Wilk
2014-09-12 20:03 ` Andy Lutomirski
2014-09-12 20:21 ` Konrad Rzeszutek Wilk
2014-09-04 20:31 ` Toshi Kani
2014-09-04 20:50 ` Andy Lutomirski
2014-09-04 23:27 ` Toshi Kani
2014-09-05 10:23 ` Ingo Molnar
2014-09-05 13:50 ` Toshi Kani
2014-09-07 13:58 ` Henrique de Moraes Holschuh
2014-09-04 18:35 ` [PATCH 2/5] x86, mm, pat: Change reserve_memtype() to handle WT Toshi Kani
2014-09-04 18:35 ` [PATCH 3/5] x86, mm, asm-gen: Add ioremap_wt() for WT Toshi Kani
2014-09-04 18:35 ` [PATCH 4/5] x86, mm: Add set_memory_wt() " Toshi Kani
2014-09-04 18:57 ` Andy Lutomirski
2014-09-04 18:57 ` Toshi Kani
2014-09-04 19:14 ` Andy Lutomirski [this message]
2014-09-04 19:30 ` Toshi Kani
2014-09-07 8:49 ` Yigal Korman
2014-09-07 16:49 ` Andy Lutomirski
2014-09-08 15:07 ` Toshi Kani
2014-09-08 17:23 ` Andy Lutomirski
2014-09-08 18:42 ` Toshi Kani
2014-09-04 18:35 ` [PATCH 5/5] x86, mm, pat: Add pgprot_writethrough() " Toshi Kani
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