* Mark Hills <mark@pogo.org.uk> [2010-09-09 11:01:45]:

quoted text
> On Thu, 2 Sep 2010, KAMEZAWA Hiroyuki wrote:
> 
> [...]
> > But hmm...it's curious who holds mutex and what happens.
> 
> I have a system showing the failure case (but still do not have a way to 
> reliably repeat it)
> 
> Here are the two processes:
> 
> 23586 pts/0    RL+  5059:18 /net/homes/mhills/tmp/soaked-cgroup
> 23685 pts/6    DL+    0:00 /net/homes/mhills/tmp/soaked-cgroup
> 
> 23586 spends almost all of its time in 'RL+' status, occasionally it is 
> seen in 'DL+' status.
> 
> From my analysis before, both are blocked on rmdir(), but one is spinning, 
> holding the lock on the /cgroup, and the other is waiting for the lock. If 
> I strace 23586 then the rmdir() fails with EINTR.
>

Any chance you can compile with debug cgroup subsystem and get
information from there? 

-- 
	Three Cheers,
	Balbir
--
unsubscribe notice
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@vger.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/