On Tue, Feb 13, 2007 at 11:18:57AM +0530, Srivatsa Vaddagiri wrote: > Which make me wonder why we need task_lock() at all ..I can understand > the need for a lock like that if we are reading/updating multiple words > in task_struct under the lock. In this case, it is used to read/write > just one pointer, isnt it? I think it can be eliminated all-together > with the use of RCU. I see that cpuset.c uses task_lock to read/write multiple words (cpuset_update_task_memory_state) ..So yes it is necessary in attach_task() .. -- Regards, vatsa
