From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Message-ID: <53AC695C.2090406@arm.com> Date: Thu, 26 Jun 2014 19:41:32 +0100 From: Sudeep Holla MIME-Version: 1.0 Subject: Re: [PATCH 2/9] drivers: base: support cpu cache information interface to userspace via sysfs References: <1403717444-23559-1-git-send-email-sudeep.holla@arm.com> <1403717444-23559-3-git-send-email-sudeep.holla@arm.com> <20140625222355.GK32514@n2100.arm.linux.org.uk> In-Reply-To: <20140625222355.GK32514@n2100.arm.linux.org.uk> Content-Type: text/plain; charset=WINDOWS-1252; format=flowed Content-Transfer-Encoding: 8BIT Sender: linux-kernel-owner@vger.kernel.org List-Archive: List-Post: To: Russell King - ARM Linux Cc: Sudeep Holla , "linux-kernel@vger.kernel.org" , Rob Herring , "linux-s390@vger.kernel.org" , Lorenzo Pieralisi , "linux-ia64@vger.kernel.org" , "linux-doc@vger.kernel.org" , Greg Kroah-Hartman , "x86@kernel.org" , Heiko Carstens , "linux390@de.ibm.com" , "linuxppc-dev@lists.ozlabs.org" , "linux-arm-kernel@lists.infradead.org" List-ID: 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