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-rw-r--r--kernel/sched.c33
1 files changed, 31 insertions, 2 deletions
diff --git a/kernel/sched.c b/kernel/sched.c
index d6b149c..d9d79a4 100644
--- a/kernel/sched.c
+++ b/kernel/sched.c
@@ -72,6 +72,7 @@
#include <linux/ftrace.h>
#include <linux/slab.h>
#include <linux/init_task.h>
+#include <linux/jump_label.h>
#include <asm/tlb.h>
#include <asm/irq_regs.h>
@@ -503,7 +504,32 @@ static void destroy_cfs_bandwidth(struct cfs_bandwidth *cfs_b)
hrtimer_cancel(&cfs_b->period_timer);
hrtimer_cancel(&cfs_b->slack_timer);
}
-#else
+
+#ifdef HAVE_JUMP_LABEL
+static struct jump_label_key __cfs_bandwidth_used;
+
+static inline bool cfs_bandwidth_used(void)
+{
+ return static_branch(&__cfs_bandwidth_used);
+}
+
+static void account_cfs_bandwidth_used(int enabled, int was_enabled)
+{
+ /* only need to count groups transitioning between enabled/!enabled */
+ if (enabled && !was_enabled)
+ jump_label_inc(&__cfs_bandwidth_used);
+ else if (!enabled && was_enabled)
+ jump_label_dec(&__cfs_bandwidth_used);
+}
+#else /* !HAVE_JUMP_LABEL */
+/* static_branch doesn't help unless supported */
+static int cfs_bandwidth_used(void)
+{
+ return 1;
+}
+static void account_cfs_bandwidth_used(int enabled, int was_enabled) {}
+#endif /* HAVE_JUMP_LABEL */
+#else /* !CONFIG_CFS_BANDWIDTH */
static void init_cfs_rq_runtime(struct cfs_rq *cfs_rq) {}
static void init_cfs_bandwidth(struct cfs_bandwidth *cfs_b) {}
static void destroy_cfs_bandwidth(struct cfs_bandwidth *cfs_b) {}
@@ -9203,7 +9229,7 @@ static int __cfs_schedulable(struct task_group *tg, u64 period, u64 runtime);
static int tg_set_cfs_bandwidth(struct task_group *tg, u64 period, u64 quota)
{
- int i, ret = 0, runtime_enabled;
+ int i, ret = 0, runtime_enabled, runtime_was_enabled;
struct cfs_bandwidth *cfs_b = tg_cfs_bandwidth(tg);
if (tg == &root_task_group)
@@ -9231,6 +9257,9 @@ static int tg_set_cfs_bandwidth(struct task_group *tg, u64 period, u64 quota)
goto out_unlock;
runtime_enabled = quota != RUNTIME_INF;
+ runtime_was_enabled = cfs_b->quota != RUNTIME_INF;
+ account_cfs_bandwidth_used(runtime_enabled, runtime_was_enabled);
+
raw_spin_lock_irq(&cfs_b->lock);
cfs_b->period = ns_to_ktime(period);
cfs_b->quota = quota;
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