so, i exchanged my problematic MBPr 13" 512 8G. and for 3 days, i had no problem and as i monitors "Activity Monitor" i did not see kernel_task. it was yesterday, when this demon came back on...... now it takes up 2.4GB of ram and only takes more and more as time goes by. i googled about kernel_task and i found no luck about this situation. kernel panic has not happened yet, but im so worried... rebooting only does decrease the amount of ram taken to about 500MB not eliminating the process... what the heck is this and how do you guys deal with it? my friend who has mav. on his 2010 MBP never gets kernel_task. every post i googled said that kernel_task is part of OS X, then how come some do see them but not all?