linux-kernel - Re: [PATCH RFC/RFT v2 1/8] drivers: base: support cpu cache information interface to userspace via sysfs

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Date:	Fri, 7 Feb 2014 11:29:25 -0800
From:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:	Sudeep Holla <sudeep.holla@....com>
Cc:	linux-kernel@...r.kernel.org, Rob Herring <robh@...nel.org>,
	linux-doc@...r.kernel.org
Subject: Re: [PATCH RFC/RFT v2 1/8] drivers: base: support cpu cache
 information interface to userspace via sysfs

On Fri, Feb 07, 2014 at 04:49:16PM +0000, Sudeep Holla wrote:
> From: Sudeep Holla <sudeep.holla@....com>
> 
> This patch adds initial support for providing processor cache information
> to userspace through sysfs interface. This is based on already existing
> implementations(x86, ia64, s390 and powerpc) and hence the interface is
> intended to be fully compatible.
> 
> The main purpose of this generic support is to avoid further code
> duplication to support new architectures and also to unify all the existing
> different implementations.
> 
> This implementation maintains the hierarchy of cache objects which reflects
> the system's cache topology. Cache objects are instantiated as needed as
> CPUs come online. The cache objects are replicated per-cpu even if they are
> shared. A per-cpu array of cache information maintained is used mainly for
> sysfs-related book keeping.

I thought I asked that you not use "raw" kobjects for this, instead
using 'struct device' or just an attribute group?

Using a kobject means that userspace tools that use libudev have no
chance to see these attributes at all, which is not good, right?

thanks,

greg k-h
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