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authorIngo Molnar <mingo@elte.hu>2007-09-19 23:34:46 +0200
committerIngo Molnar <mingo@elte.hu>2007-09-19 23:34:46 +0200
commit1799e35d5baab6e06168b46cc78b968e728ea3d1 (patch)
treecccf64a62fa9106aa18253371b675925c0582bab /kernel/sched.c
parenta88a8eff1e6e32d3288986a9d36c6a449c032d3a (diff)
sched: add /proc/sys/kernel/sched_compat_yield
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: Ingo Molnar <mingo@elte.hu> Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
Diffstat (limited to 'kernel/sched.c')
-rw-r--r--kernel/sched.c5
1 files changed, 1 insertions, 4 deletions
diff --git a/kernel/sched.c b/kernel/sched.c
index deeb1f8e0c30..63e0971c8fbb 100644
--- a/kernel/sched.c
+++ b/kernel/sched.c
@@ -4550,10 +4550,7 @@ asmlinkage long sys_sched_yield(void)
struct rq *rq = this_rq_lock();
schedstat_inc(rq, yld_cnt);
- if (unlikely(rq->nr_running == 1))
- schedstat_inc(rq, yld_act_empty);
- else
- current->sched_class->yield_task(rq, current);
+ current->sched_class->yield_task(rq, current);
/*
* Since we are going to call schedule() anyway, there's