linux-kernel - Re: Bad rss-counter is back on 3.14-stable

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Date:	Wed, 4 Jun 2014 18:22:50 -0400
From:	Dave Jones <davej@...hat.com>
To:	Brandon Philips <brandon.philips@...eos.com>
Cc:	Greg KH <gregkh@...uxfoundation.org>, linux-mm@...ck.org,
	Linux Kernel <linux-kernel@...r.kernel.org>
Subject: Re: Bad rss-counter is back on 3.14-stable

On Wed, Jun 04, 2014 at 12:35:45PM -0700, Brandon Philips wrote:
 > On Wed, Jun 4, 2014 at 12:12 PM, Dave Jones <davej@...hat.com> wrote:
 > > Brandon, what kind of workload is that machine doing ? I wonder if I can
 > > add something to trinity to make it provoke it.
 > 
 > A really boring database workload (fsync() ~50ms) with a sloowww block
 > device with btrfs. There are occasional CPU spikes due to expensive
 > queries.
 > 
 > How can I be more helpful in my workload description?

I feared it would be something like a database. Trying to replicate
things seen under those workloads always seems to be challenging,
in part due to the system specific setups they seem to have.

I wonder if any of the benchmarking apps we have do a realistic
representation of what modern databases do. It might be a fun project
to take something like that and extend it to do random queries.

	Dave

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