sched: Update normalized values on user updates via proc

The normalized values are also recalculated in case the scaling factor
changes.

This patch updates the internally used scheduler tuning values that are
normalized to one cpu in case a user sets new values via sysfs.

Together with patch 2 of this series this allows to let user configured
values scale (or not) to cpu add/remove events taking place later.

Signed-off-by: Christian Ehrhardt <ehrhardt@linux.vnet.ibm.com>
Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
LKML-Reference: <1259579808-11357-4-git-send-email-ehrhardt@linux.vnet.ibm.com>
[ v2: fix warning ]
Signed-off-by: Ingo Molnar <mingo@elte.hu>

1 files changed, 10 insertions, 2 deletions

diff --git a/kernel/sched.c b/kernel/sched.c
index 116efed962c6..0a60e8e9b094 100644
--- a/kernel/sched.c
+++ b/kernel/sched.c
@@ -1816,6 +1816,7 @@ static void cfs_rq_set_shares(struct cfs_rq *cfs_rq, unsigned long shares)
 
 static void calc_load_account_active(struct rq *this_rq);
 static void update_sysctl(void);
+static int get_update_sysctl_factor(void);
 
 static inline void __set_task_cpu(struct task_struct *p, unsigned int cpu)
 {
@@ -7030,9 +7031,9 @@ cpumask_var_t nohz_cpu_mask;
  *
  * This idea comes from the SD scheduler of Con Kolivas:
  */
-static void update_sysctl(void)
+static int get_update_sysctl_factor(void)
 {
-        unsigned int cpus = min(num_online_cpus(), 8U);
+        unsigned int cpus = min(num_online_cpus(), 8);
         unsigned int factor;
 
         switch (sysctl_sched_tunable_scaling) {
@@ -7048,6 +7049,13 @@ static void update_sysctl(void)
                 break;
         }
 
+        return factor;
+}
+
+static void update_sysctl(void)
+{
+        unsigned int factor = get_update_sysctl_factor();
+
 #define SET_SYSCTL(name) \
         (sysctl_##name = (factor) * normalized_sysctl_##name)
         SET_SYSCTL(sched_min_granularity);