problems with printk's

Hi,
  i am studing a driver's code.

  i have added a line printk (KERN_DEBUG __FUNCTION)  which is supposed to
  print the name of the function.

  I want to trace the program - what is happening.


  When i see the output of the driver using dmesg

  Only some of the prints are visible (some of them are not printed
even though they
   must get printed. i dont know why this is happening.

  Is there any limit on printk (like number of messages....)


  How do i disable (ie printk should print irrespective of any limit
or anything).


  Regard,,
   sriram
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