linux-kernel - Re: [PATCH 2/9] drivers: base: support cpu cache information interface to userspace via sysfs

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Date:	Thu, 26 Jun 2014 19:41:32 +0100
From:	Sudeep Holla <sudeep.holla@....com>
To:	Russell King - ARM Linux <linux@....linux.org.uk>
CC:	Sudeep Holla <sudeep.holla@....com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Rob Herring <robh@...nel.org>,
	"linux-s390@...r.kernel.org" <linux-s390@...r.kernel.org>,
	Lorenzo Pieralisi <Lorenzo.Pieralisi@....com>,
	"linux-ia64@...r.kernel.org" <linux-ia64@...r.kernel.org>,
	"linux-doc@...r.kernel.org" <linux-doc@...r.kernel.org>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	"x86@...nel.org" <x86@...nel.org>,
	Heiko Carstens <heiko.carstens@...ibm.com>,
	"linux390@...ibm.com" <linux390@...ibm.com>,
	"linuxppc-dev@...ts.ozlabs.org" <linuxppc-dev@...ts.ozlabs.org>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>
Subject: Re: [PATCH 2/9] drivers: base: support cpu cache information interface
 to userspace via sysfs

Hi,

On 25/06/14 23:23, Russell King - ARM Linux wrote:
> On Wed, Jun 25, 2014 at 06:30:37PM +0100, Sudeep Holla wrote:
>> +		coherency_line_size: the minimum amount of data that gets transferred
>
> So, what value to do envision this taking for a CPU where the cache
> line size is 32 bytes, but each cache line has two dirty bits which
> allow it to only evict either the upper or lower 16 bytes depending
> on which are dirty?
>

IIUC most of existing implementations of cacheinfo on various architectures
are representing the cache line size as coherency_line_size, in which case I
need fix the definition in this file.

BTW will there be any architectural way of finding such configuration ?

Regards,
Sudeep

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