linux-kernel - RE: [PATCH 0/8] Add hardware prefetch control driver for arm64 and x86

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Message-ID: <OSBPR01MB203754574F2AC6281EFA1FDE80209@OSBPR01MB2037.jpnprd01.prod.outlook.com>
Date:   Wed, 26 Jan 2022 09:24:35 +0000
From:   "tarumizu.kohei@...itsu.com" <tarumizu.kohei@...itsu.com>
To:     'Dave Hansen' <dave.hansen@...el.com>,
        "catalin.marinas@....com" <catalin.marinas@....com>,
        "will@...nel.org" <will@...nel.org>,
        "tglx@...utronix.de" <tglx@...utronix.de>,
        "mingo@...hat.com" <mingo@...hat.com>,
        "bp@...en8.de" <bp@...en8.de>,
        "dave.hansen@...ux.intel.com" <dave.hansen@...ux.intel.com>,
        "x86@...nel.org" <x86@...nel.org>, "hpa@...or.com" <hpa@...or.com>,
        "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: RE: [PATCH 0/8] Add hardware prefetch control driver for arm64 and
 x86

> Doesn't this break the one-value-per-file sysfs rules?

Sorry, I forgot the sysfs rules.

The current interface specification was decided referring to the
specification of /sys/class/rnbd-client/ctl/map_device. However,
I thought that the current specification of preftch_control was
inappropriate because it relevant to "Mixing types, expressing
multiple lines of data" in Documentation/filesystems/sysfs.rst.

The next version patch divides the attribute file by option, as
described below.

* Current version interface

```
/sys/devices/system/cpu/cpu0/cache/index0/
	prefetch_control (attribute file)
```

* Next version interface look like this

```
/sys/devices/system/cpu/cpu0/cache/index0/prefetch_control/
	hardware_prefetcher_enable (attribute file)
	ip_prefetcher_enable (attribute file)
```