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authorPeter Zijlstra <a.p.zijlstra@chello.nl>2008-04-19 19:44:57 +0200
committerIngo Molnar <mingo@elte.hu>2008-04-19 19:44:57 +0200
commitd0b27fa77854b149ad4af08b0fe47fe712a47ade (patch)
tree2f4487c108a5132e8d52456567b4a67e78fbb4a6 /kernel/user.c
parent57d3da2911787a101a384532f4519f9640bae883 (diff)
downloadlwn-d0b27fa77854b149ad4af08b0fe47fe712a47ade.tar.gz
lwn-d0b27fa77854b149ad4af08b0fe47fe712a47ade.zip
sched: rt-group: synchonised bandwidth period
Various SMP balancing algorithms require that the bandwidth period run in sync. Possible improvements are moving the rt_bandwidth thing into root_domain and keeping a span per rt_bandwidth which marks throttled cpus. Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl> Signed-off-by: Ingo Molnar <mingo@elte.hu>
Diffstat (limited to 'kernel/user.c')
-rw-r--r--kernel/user.c28
1 files changed, 28 insertions, 0 deletions
diff --git a/kernel/user.c b/kernel/user.c
index 7132022a040c..5925c6887c10 100644
--- a/kernel/user.c
+++ b/kernel/user.c
@@ -193,6 +193,33 @@ static ssize_t cpu_rt_runtime_store(struct kobject *kobj,
static struct kobj_attribute cpu_rt_runtime_attr =
__ATTR(cpu_rt_runtime, 0644, cpu_rt_runtime_show, cpu_rt_runtime_store);
+
+static ssize_t cpu_rt_period_show(struct kobject *kobj,
+ struct kobj_attribute *attr,
+ char *buf)
+{
+ struct user_struct *up = container_of(kobj, struct user_struct, kobj);
+
+ return sprintf(buf, "%lu\n", sched_group_rt_period(up->tg));
+}
+
+static ssize_t cpu_rt_period_store(struct kobject *kobj,
+ struct kobj_attribute *attr,
+ const char *buf, size_t size)
+{
+ struct user_struct *up = container_of(kobj, struct user_struct, kobj);
+ unsigned long rt_period;
+ int rc;
+
+ sscanf(buf, "%lu", &rt_period);
+
+ rc = sched_group_set_rt_period(up->tg, rt_period);
+
+ return (rc ? rc : size);
+}
+
+static struct kobj_attribute cpu_rt_period_attr =
+ __ATTR(cpu_rt_period, 0644, cpu_rt_period_show, cpu_rt_period_store);
#endif
/* default attributes per uid directory */
@@ -202,6 +229,7 @@ static struct attribute *uids_attributes[] = {
#endif
#ifdef CONFIG_RT_GROUP_SCHED
&cpu_rt_runtime_attr.attr,
+ &cpu_rt_period_attr.attr,
#endif
NULL
};