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

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Date:	Wed, 25 Jun 2014 23:23:56 +0100
From:	Russell King - ARM Linux <linux@....linux.org.uk>
To:	Sudeep Holla <sudeep.holla@....com>
Cc:	linux-kernel@...r.kernel.org, Rob Herring <robh@...nel.org>,
	linux-s390@...r.kernel.org,
	Lorenzo Pieralisi <Lorenzo.Pieralisi@....com>,
	linux-ia64@...r.kernel.org, linux-doc@...r.kernel.org,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	x86@...nel.org, Heiko Carstens <heiko.carstens@...ibm.com>,
	linux390@...ibm.com, linuxppc-dev@...ts.ozlabs.org,
	linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH 2/9] drivers: base: support cpu cache information
	interface to userspace via sysfs

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?

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