linux-kernel - Re: [GIT pull] x86/cache: Updates for 4.10

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Date:   Wed, 21 Dec 2016 13:31:37 -0800
From:   Fenghua Yu <fenghua.yu@...el.com>
To:     Linus Torvalds <torvalds@...ux-foundation.org>,
        Thomas Gleixner <tglx@...utronix.de>
Cc:     Tony Luck <tony.luck@...el.com>,
        Peter Zijlstra <peterz@...radead.org>,
        "H. Peter Anvin" <h.peter.anvin@...el.com>,
        Ingo Molnar <mingo@...e.hu>,
        linux-kernel <linux-kernel@...r.kernel.org>
Subject: Re: [GIT pull] x86/cache: Updates for 4.10

On Tue, Dec 13, 2016, Thomas Gleixner <tglx@...utronix.de> wrote:
> On Mon, 12 Dec 2016, Linus Torvalds wrote:
> On Mon, Dec 12, 2016 at 1:53 AM, Thomas Gleixner <tglx@...utronix.de> wrote:
>> It looks pretty self-contained (good), but it also looks majorly
>> strange. I will have to think about this. What are the main/expected
>> users?
> - Virtualization so a VM can only trash only the associated part of the
> cash w/o disturbing others
> 
> - Real-Time systems to seperate RT and general workloads.
> 
> - Latency sensitive enterprise workloads
> 
> - In theory this also can be used to protect against cache side channel
> attacks.

Quite a few companies and research groups are interested in the hardware
feature and/or the resctrl file system interface. They do demonstrate
performance and QoS improvements in real-time, VM, and native Linux
by partitioning cache for processes to avoid noisy neighbors.

Thanks.

-Fenghua