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sched: Update normalized values on user updates via proc

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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>
This commit is contained in:
Christian Ehrhardt
2009-11-30 12:16:48 +01:00
committed by Ingo Molnar
parent 1983a922a1
commit acb4a848da
3 changed files with 29 additions and 8 deletions
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12
kernel/sched.c
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@@ -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);