diff options
| author | Ingo Molnar <mingo@elte.hu> | 2007-10-15 17:00:02 +0200 |
|---|---|---|
| committer | Ingo Molnar <mingo@elte.hu> | 2007-10-15 17:00:02 +0200 |
| commit | 38ad464d410dadceda1563f36bdb0be7fe4c8938 (patch) | |
| tree | 32d47a47e3d387792d6d8db6e8ee9ae3e93b8469 /kernel/sched.c | |
| parent | eba1ed4b7e52720e3099325874811c38a5ec1562 (diff) | |
sched: uniform tunings
use the same defaults on both UP and SMP.
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
Signed-off-by: Mike Galbraith <efault@gmx.de>
Reviewed-by: Thomas Gleixner <tglx@linutronix.de>
Diffstat (limited to 'kernel/sched.c')
| -rw-r--r-- | kernel/sched.c | 28 |
1 files changed, 0 insertions, 28 deletions
diff --git a/kernel/sched.c b/kernel/sched.c index 282d037c7300..2520923a0c3b 100644 --- a/kernel/sched.c +++ b/kernel/sched.c @@ -4898,32 +4898,6 @@ void __cpuinit init_idle(struct task_struct *idle, int cpu) */ cpumask_t nohz_cpu_mask = CPU_MASK_NONE; -/* - * Increase the granularity value when there are more CPUs, - * because with more CPUs the 'effective latency' as visible - * to users decreases. But the relationship is not linear, - * so pick a second-best guess by going with the log2 of the - * number of CPUs. - * - * This idea comes from the SD scheduler of Con Kolivas: - */ -static inline void sched_init_granularity(void) -{ - unsigned int factor = 1 + ilog2(num_online_cpus()); - const unsigned long limit = 100000000; - - sysctl_sched_min_granularity *= factor; - if (sysctl_sched_min_granularity > limit) - sysctl_sched_min_granularity = limit; - - sysctl_sched_latency *= factor; - if (sysctl_sched_latency > limit) - sysctl_sched_latency = limit; - - sysctl_sched_runtime_limit = sysctl_sched_latency; - sysctl_sched_wakeup_granularity = sysctl_sched_min_granularity / 2; -} - #ifdef CONFIG_SMP /* * This is how migration works: @@ -6491,12 +6465,10 @@ void __init sched_init_smp(void) /* Move init over to a non-isolated CPU */ if (set_cpus_allowed(current, non_isolated_cpus) < 0) BUG(); - sched_init_granularity(); } #else void __init sched_init_smp(void) { - sched_init_granularity(); } #endif /* CONFIG_SMP */ |