sched: rt-group: interface

Change the rt_ratio interface to rt_runtime_us, to match rt_period_us.
This avoids picking a granularity for the ratio.

Extend the /sys/kernel/uids/<uid>/ interface to allow setting
the group's rt_runtime.

Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
Signed-off-by: Ingo Molnar <mingo@elte.hu>

1 files changed, 28 insertions, 0 deletions

diff --git a/kernel/user.c b/kernel/user.c
index 7d7900c5a1fd..9f6d471bfd03 100644
--- a/kernel/user.c
+++ b/kernel/user.c
@@ -164,9 +164,37 @@ static ssize_t cpu_shares_store(struct kobject *kobj,
 static struct kobj_attribute cpu_share_attr =
         __ATTR(cpu_share, 0644, cpu_shares_show, cpu_shares_store);
 
+static ssize_t cpu_rt_runtime_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_runtime(up->tg));
+}
+
+static ssize_t cpu_rt_runtime_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_runtime;
+        int rc;
+
+        sscanf(buf, "%lu", &rt_runtime);
+
+        rc = sched_group_set_rt_runtime(up->tg, rt_runtime);
+
+        return (rc ? rc : size);
+}
+
+static struct kobj_attribute cpu_rt_runtime_attr =
+        __ATTR(cpu_rt_runtime, 0644, cpu_rt_runtime_show, cpu_rt_runtime_store);
+
 /* default attributes per uid directory */
 static struct attribute *uids_attributes[] = {
         &cpu_share_attr.attr,
+        &cpu_rt_runtime_attr.attr,
         NULL
 };