linux-kernel - Re: [PATCH 5/5] Documentation: ABI: document /sys/devices/system/cpu/

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Date:	Mon, 19 Oct 2009 20:28:03 -0700 (PDT)
From:	David Rientjes <rientjes@...gle.com>
To:	Alex Chiang <achiang@...com>
cc:	akpm@...ux-foundation.org, Randy Dunlap <randy.dunlap@...cle.com>,
	linux-mm@...ck.org, linux-kernel@...r.kernel.org,
	Greg KH <greg@...ah.com>
Subject: Re: [PATCH 5/5] Documentation: ABI: document
 /sys/devices/system/cpu/

On Mon, 19 Oct 2009, Alex Chiang wrote:

> diff --git a/Documentation/ABI/testing/sysfs-devices-cpu b/Documentation/ABI/testing/sysfs-devices-cpu
> new file mode 100644
> index 0000000..9070889
> --- /dev/null
> +++ b/Documentation/ABI/testing/sysfs-devices-cpu

Shouldn't this be called sysfs-devices-system-cpu?

I see what you're doing: /sys/devices/system/node/* files are contained in 
sysfs-devices-memory, but I think it would be helpful to have a more 
strict naming scheme so that the contents of a sysfs directory are 
described by a file of the same name.

> @@ -0,0 +1,42 @@
> +What:		/sys/devices/system/cpu/
> +Date:		October 2009
> +Contact:	Linux kernel mailing list <linux-kernel@...r.kernel.org>
> +Description:
> +		A collection of CPU attributes, including cache information,
> +		topology, and frequency. It also contains a mechanism to
> +		logically hotplug CPUs.
> +
> +		The actual attributes present are architecture and
> +		configuration dependent.
> +
> +
> +What:		/sys/devices/system/cpu/$cpu/online

cpu# ?

> +Date:		January 2006
> +Contact:	Linux kernel mailing list <linux-kernel@...r.kernel.org>
> +Description:
> +		When CONFIG_HOTPLUG_CPU is enabled, allows the user to
> +		discover and change the online state of a CPU. To discover
> +		the state:

This is present even without CONFIG_HOTPLUG_CPU.

> +
> +		cat /sys/devices/system/cpu/$cpu/online
> +
> +		A value of 0 indicates the CPU is offline. A value of 1
> +		indicates it is online. To change the state, echo the
> +		desired new state into the file:
> +
> +		echo [0|1] > /sys/devices/system/cpu/$cpu/online
> +
> +		For more information, please read Documentation/cpu-hotplug.txt
> +
> +
> +What:		/sys/devices/system/cpu/$cpu/node
> +Date:		October 2009
> +Contact:	Linux memory management mailing list <linux-mm@...ck.org>
> +Description:
> +		When CONFIG_NUMA is enabled, a symbolic link that points
> +		to the corresponding NUMA node directory.
> +
> +		For example, the following symlink is created for cpu42
> +		in NUMA node 2:
> +
> +		/sys/devices/system/cpu/cpu42/node2 -> ../../node/node2
> 


Would it be possible for you to document all entities in 
/sys/devices/system/cpu/* in this new file (requiring a folding of 
Documentation/ABI/testing/sysfs-devices-cache_disable into it)?
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