Re: [PATCH] sysctl: Add a feature to drop caches selectively

From: Dave Chinner <david@fromorbit.com>
To: Artem Bityutskiy <dedekind1@gmail.com>
Cc: Thomas Knauth <thomas.knauth@gmx.de>,
	David Rientjes <rientjes@google.com>,
	Maksym Planeta <mcsim.planeta@gmail.com>,
	Alexander Viro <viro@zeniv.linux.org.uk>,
	linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org
Subject: Re: [PATCH] sysctl: Add a feature to drop caches selectively
Date: Fri, 27 Jun 2014 12:48:34 +1000	[thread overview]
Message-ID: <20140627024834.GX9508@dastard> (raw)
In-Reply-To: <1403763199.20275.39.camel@sauron.fi.intel.com>

On Thu, Jun 26, 2014 at 09:13:19AM +0300, Artem Bityutskiy wrote:
> On Thu, 2014-06-26 at 11:06 +1000, Dave Chinner wrote:
> > Your particular use case can be handled by directing your benchmark
> > at a filesystem mount point and unmounting the filesystem in between 
> > benchmark runs. There is no ned to adding kernel functionality for
> > somethign that can be so easily acheived by other means, especially
> > in benchmark environments where *everything* is tightly controlled.
> 
> If I was a benchmark writer, I would not be willing running it as root
> to be able to mount/unmount, I would not be willing to require the
> customer creating special dedicated partitions for the benchmark,
> because this is too user-unfriendly. Or do I make incorrect assumptions?

Just add the dev/mntpt to /etc/fstab and add "user" to the
configuration and the need for root goes away.

Cheers,

Dave.
-- 
Dave Chinner
david@fromorbit.com