sched_debug: runnable tasks sum-sleep

Hi, i am looking for document to understand the output of "cat /proc/sched_debug": .. runnable tasks: task PID tree-key switches prio exec-runtime sum-execsum-sleep

need help to clear kernel (2.6.16.17) cached memory

Hi, on my system (based on 2.6.16.17), i am trying to clear the cached memory but it is not being cleared. mars# free -m total used free sharedbuffers cached Mem: 925459465 0 0231 -/+ buffers/cache:22