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

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Date:	Mon, 22 Sep 2014 09:55:18 +0100
From:	Sudeep Holla <sudeep.holla@....com>
To:	Stephen Boyd <sboyd@...eaurora.org>,
	LKML <linux-kernel@...r.kernel.org>
CC:	Sudeep Holla <sudeep.holla@....com>,
	Heiko Carstens <heiko.carstens@...ibm.com>,
	Lorenzo Pieralisi <Lorenzo.Pieralisi@....com>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	"linux-api@...r.kernel.org" <linux-api@...r.kernel.org>,
	"linux390@...ibm.com" <linux390@...ibm.com>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	"linux-ia64@...r.kernel.org" <linux-ia64@...r.kernel.org>,
	"linuxppc-dev@...ts.ozlabs.org" <linuxppc-dev@...ts.ozlabs.org>,
	"linux-s390@...r.kernel.org" <linux-s390@...r.kernel.org>,
	"x86@...nel.org" <x86@...nel.org>
Subject: Re: [PATCH v4 04/11] drivers: base: support cpu cache information
 interface to userspace via sysfs

Hi Stephen,

On 19/09/14 23:24, Stephen Boyd wrote:
> 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>
>

Thanks for all the reviews and testings of the series.

Regards,
Sudeep

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