linux-kernel - Re: [RFC PATCH v2 0/5] Add hardware prefetch driver for A64FX and Intel processors

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Message-ID: <20211104171012.GC174703@worktop.programming.kicks-ass.net>
Date:   Thu, 4 Nov 2021 18:10:12 +0100
From:   Peter Zijlstra <peterz@...radead.org>
To:     Kohei Tarumizu <tarumizu.kohei@...itsu.com>
Cc:     catalin.marinas@....com, will@...nel.org, tglx@...utronix.de,
        mingo@...hat.com, bp@...en8.de, dave.hansen@...ux.intel.com,
        x86@...nel.org, hpa@...or.com,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [RFC PATCH v2 0/5] Add hardware prefetch driver for A64FX and
 Intel processors

On Thu, Nov 04, 2021 at 02:21:17PM +0900, Kohei Tarumizu wrote:
> This patch series add hardware prefetch driver register/unregister
> function. The purpose of this driver is to provide an interface to
> control the hardware prefetch mechanism depending on the application
> characteristics.

Here you talk about applications..

> An earlier RFC[1], we were suggested that we create a hardware
> prefetch directory under /sys/devices/system/cpu/[CPUNUM]/cache.
> Hardware prefetch is a cache-related feature, but it does not require
> cache sysfs feature. Therefore, we decided to isolate the code.
> Specifically, create a directory under cpu/[CPUNUM].

Here you talk about CPUs..

How does that work?