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

[Ingo Molnar <mingo@elte.hu>]

* Chris Mason <chris.mason@oracle.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