• Ingo Molnar's avatar
    sched: add /proc/sys/kernel/sched_compat_yield · 1799e35d
    Ingo Molnar authored
    add /proc/sys/kernel/sched_compat_yield to make sys_sched_yield()
    more agressive, by moving the yielding task to the last position
    in the rbtree.
    
    with sched_compat_yield=0:
    
       PID USER      PR  NI  VIRT  RES  SHR S %CPU %MEM    TIME+  COMMAND
      2539 mingo     20   0  1576  252  204 R   50  0.0   0:02.03 loop_yield
      2541 mingo     20   0  1576  244  196 R   50  0.0   0:02.05 loop
    
    with sched_compat_yield=1:
    
       PID USER      PR  NI  VIRT  RES  SHR S %CPU %MEM    TIME+  COMMAND
      2584 mingo     20   0  1576  248  196 R   99  0.0   0:52.45 loop
      2582 mingo     20   0  1576  256  204 R    0  0.0   0:00.00 loop_yield
    Signed-off-by: default avatarIngo Molnar <mingo@elte.hu>
    Signed-off-by: default avatarPeter Zijlstra <a.p.zijlstra@chello.nl>
    1799e35d
sched.c 166 KB