Re: [PATCH] RCU torture-testing kernel module

[Badari Pulavarty <pbadari@gmail.com>]

On Sun, 2005-10-23 at 17:47 -0700, Paul E. McKenney wrote:
> On Sun, Oct 23, 2005 at 12:05:21PM -0700, Andrew Morton wrote:
> > Ingo Oeser <ioe-lkml@rameria.de> wrote:
> > >
> > > DEBUG_KERNEL should do nothing more than showing the debugging
> > >  options. 
> > 
> > yup.
> > 
> > >  E.g. I don't expect to enable any additional code in an 
> > >  unrelated file, if I enable Magic-SysRQ on an embedded, unattended device
> > >  to be able to analyze potential problems via serial console.
> > > 
> > >  @Andrew: Would you accept a patch to fix that?
> > 
> > more yup.
> 
> OK, the attached patch covers this and also fixes the redundant #include
> that Greg KH spotted.
> 
> Thoughts?

Paul,

I enabled RCU_TORTURE_TEST in 2.6.14-rc5-mm1. My machine took 10+
minutes to boot and let me login. RCU kthreads are hogging the CPU. 
Is this expected ? 

Thanks,
Badari

top - 15:32:55 up 22 min,  1 user,  load average: 10.96, 12.07, 9.18
Tasks:  94 total,  11 running,  83 sleeping,   0 stopped,   0 zombie
Cpu(s):  2.5% us, 97.5% sy,  0.0% ni,  0.0% id,  0.0% wa,  0.0% hi,
0.0% si
Mem:   7145152k total,   350656k used,  6794496k free,    50876k buffers
Swap:  1048784k total,        0k used,  1048784k free,   160168k cached

  PID USER      PR  NI  VIRT  RES  SHR S %CPU %MEM    TIME+  COMMAND
  168 root      20  -5     0    0    0 R 50.2  0.0  10:44.01
rcu_torture_rea
  171 root      20  -5     0    0    0 R 50.2  0.0  10:47.86
rcu_torture_rea
  175 root      20  -5     0    0    0 R 50.2  0.0  10:49.83
rcu_torture_rea
  169 root      20  -5     0    0    0 R 49.9  0.0  10:47.07
rcu_torture_rea
  172 root      20  -5     0    0    0 R 49.9  0.0  10:50.04
rcu_torture_rea
  173 root      20  -5     0    0    0 R 49.9  0.0  10:43.79
rcu_torture_rea
  174 root      20  -5     0    0    0 R 49.9  0.0  10:39.16
rcu_torture_rea
  170 root      20  -5     0    0    0 R 40.2  0.0  10:38.68
rcu_torture_rea