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

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Message-ID: <20140924063511.GA12929@kroah.com>
Date:	Tue, 23 Sep 2014 23:35:11 -0700
From:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:	Sudeep Holla <sudeep.holla@....com>
Cc:	LKML <linux-kernel@...r.kernel.org>,
	Heiko Carstens <heiko.carstens@...ibm.com>,
	Lorenzo Pieralisi <Lorenzo.Pieralisi@....com>,
	Stephen Boyd <sboyd@...eaurora.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

On Wed, Sep 17, 2014 at 12:00:48PM -0700, Greg Kroah-Hartman wrote:
> On Wed, Sep 17, 2014 at 06:25:10PM +0100, Sudeep Holla wrote:
> > Hi Greg,
> > 
> > On 03/09/14 18:00, 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.
> > >
> > 
> > Can you review the first 4 patches in this series please ?
> 
> It's in my todo queue, which is really long at the moment due to me
> going to conferences (at one right now...)  Will be working on this
> soon, thanks for your patience.

Based on the review comments, I think you are going to change at least
the first patch, right?  Please resend the latest version of this
series, with all of the accumulated tested-by and acked lines and
resend.

thanks,

greg k-h
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