linux-kernel - Re: [ANNOUNCE] Reiserfs/kill-bkl tree v2

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Date:	Mon, 3 Aug 2009 15:56:17 +0200
From:	Ingo Molnar <mingo@...e.hu>
To:	Chris Mason <chris.mason@...cle.com>,
	Roland Dreier <rdreier@...co.com>,
	Frederic Weisbecker <fweisbec@...il.com>,
	Andi Kleen <andi@...stfloor.org>,
	LKML <linux-kernel@...r.kernel.org>,
	Jeff Mahoney <jeffm@...e.com>,
	Alexander Beregalov <a.beregalov@...il.com>,
	Bron Gondwana <brong@...tmail.fm>,
	Reiserfs <reiserfs-devel@...r.kernel.org>,
	Al Viro <viro@...iv.linux.org.uk>,
	Andrea Gelmini <andrea.gelmini@...il.com>,
	"Trenton D. Adams" <trenton.d.adams@...il.com>,
	Thomas Meyer <thomas@...3r.de>,
	Alessio Igor Bogani <abogani@...ware.it>,
	Marcel Hilzinger <mhilzinger@...uxnewmedia.de>,
	Edward Shishkin <edward.shishkin@...il.com>
Subject: Re: [ANNOUNCE] Reiserfs/kill-bkl tree v2


* Chris Mason <chris.mason@...cle.com> wrote:

> Definitely, the cost of the rare bug is much higher.  The good 
> news is that reiserfs tends to pile its races into a few spots.  
> Most of them can be found with a 12 hour run of the namesys 
> stress.sh program and a lot of memory pressure.  I'd compile with 
> preemption on and you'll have a good test on any SMP machine.
> 
> http://oss.oracle.com/~mason/stress.sh
> 
> stress.sh just copies a source directory into the test filesystem, 
> then reads it back and deletes it in a loop.  I'd run with 50 
> procs and enough memory pressure for the box to lightly swap 
> (booting w/mem= is a fine way to make memory pressure).  This way 
> you make sure to hammer on the metadata writeback paths, which is 
> where all of the difficult races come in.
> 
> Testing with an fsx-linux process running at the same time will 
> make sure all of the mmap/truncate paths are working correctly as 
> well.

Ok, that definitely looks like something feasible to run for 
Frederic too, thanks for the detailed suggestion!

	Ingo
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