linux-kernel - Re: [PATCH v4 04/11] drivers: base: support cpu cache information interface to userspace via sysfs

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Date:	Fri, 19 Sep 2014 15:24:22 -0700
From:	Stephen Boyd <sboyd@...eaurora.org>
To:	Sudeep Holla <sudeep.holla@....com>,
	LKML <linux-kernel@...r.kernel.org>
CC:	Heiko Carstens <heiko.carstens@...ibm.com>,
	Lorenzo Pieralisi <Lorenzo.Pieralisi@....com>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	linux-api@...r.kernel.org, linux390@...ibm.com,
	linux-arm-kernel@...ts.infradead.org, linux-ia64@...r.kernel.org,
	linuxppc-dev@...ts.ozlabs.org, linux-s390@...r.kernel.org,
	x86@...nel.org
Subject: Re: [PATCH v4 04/11] drivers: base: support cpu cache information
 interface to userspace via sysfs

On 09/03/14 10:00, 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 devices are instantiated as needed as
> CPUs come online. The cache information is replicated per-cpu even if they are
> shared. A per-cpu array of cache information maintained is used mainly for
> sysfs-related book keeping.
>
> It also implements the shared_cpu_map attribute, which is essential for
> enabling both kernel and user-space to discover the system's overall cache
> topology.
>
> This patch also add the missing ABI documentation for the cacheinfo sysfs
> interface already, which is well defined and widely used.
>
> Signed-off-by: Sudeep Holla <sudeep.holla@....com>
> Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
> Cc: Stephen Boyd <sboyd@...eaurora.org>
> Cc: linux-api@...r.kernel.org
> Cc: linux390@...ibm.com
> Cc: linux-arm-kernel@...ts.infradead.org
> Cc: linux-ia64@...r.kernel.org
> Cc: linuxppc-dev@...ts.ozlabs.org
> Cc: linux-s390@...r.kernel.org
> Cc: x86@...nel.org
>

Reviewed-by: Stephen Boyd <sboyd@...eaurora.org>
Tested-by: Stephen Boyd <sboyd@...eaurora.org>

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