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Date:	Fri, 19 Sep 2014 15:24:22 -0700
From:	Stephen Boyd <>
To:	Sudeep Holla <>,
	LKML <>
CC:	Heiko Carstens <>,
	Lorenzo Pieralisi <>,
	Greg Kroah-Hartman <>,,,,,,,
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 <>
> 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 <>
> Cc: Greg Kroah-Hartman <>
> Cc: Stephen Boyd <>
> Cc:
> Cc:
> Cc:
> Cc:
> Cc:
> Cc:
> Cc:

Reviewed-by: Stephen Boyd <>
Tested-by: Stephen Boyd <>

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