sched: Make tunable scaling style configurable

[mirror_ubuntu-zesty-kernel.git] / kernel / sched.c

diff --git a/kernel/sched.c b/kernel/sched.c
index b54ecf84b6be94096715b0f5ea64608c117694bd..116efed962c6e4bb747b17a955915758f636040c 100644 (file)
--- a/kernel/sched.c
+++ b/kernel/sched.c
@@ -7033,7 +7033,20 @@ cpumask_var_t nohz_cpu_mask;
 static void update_sysctl(void)
 {
        unsigned int cpus = min(num_online_cpus(), 8U);
-       unsigned int factor = 1 + ilog2(cpus);
+       unsigned int factor;
+
+       switch (sysctl_sched_tunable_scaling) {
+       case SCHED_TUNABLESCALING_NONE:
+               factor = 1;
+               break;
+       case SCHED_TUNABLESCALING_LINEAR:
+               factor = cpus;
+               break;
+       case SCHED_TUNABLESCALING_LOG:
+       default:
+               factor = 1 + ilog2(cpus);
+               break;
+       }
 
 #define SET_SYSCTL(name) \
        (sysctl_##name = (factor) * normalized_sysctl_##name)