On Sun, 2011-09-04 at 09:53 +0800, Wu Fengguang wrote:

-static inline void task_dirties_fraction(struct task_struct *tsk,
-               long *numerator, long *denominator)
-{
-       prop_fraction_single(&vm_dirties, &tsk->dirties,
-                               numerator, denominator);
-} 

it looks like this patch removes all users of tsk->dirties, but doesn't
in fact remove the data member from task_struct.

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