diff options
| -rw-r--r-- | Documentation/scheduler/sched-ext.rst | 10 | ||||
| -rw-r--r-- | kernel/sched/ext.c | 17 | ||||
| -rw-r--r-- | tools/sched_ext/scx_show_state.py | 1 |
3 files changed, 28 insertions, 0 deletions
diff --git a/Documentation/scheduler/sched-ext.rst b/Documentation/scheduler/sched-ext.rst index a707d2181a77..6c0d70e2e27d 100644 --- a/Documentation/scheduler/sched-ext.rst +++ b/Documentation/scheduler/sched-ext.rst @@ -83,6 +83,15 @@ The current status of the BPF scheduler can be determined as follows: # cat /sys/kernel/sched_ext/root/ops simple +You can check if any BPF scheduler has ever been loaded since boot by examining +this monotonically incrementing counter (a value of zero indicates that no BPF +scheduler has been loaded): + +.. code-block:: none + + # cat /sys/kernel/sched_ext/enable_seq + 1 + ``tools/sched_ext/scx_show_state.py`` is a drgn script which shows more detailed information: @@ -96,6 +105,7 @@ detailed information: enable_state : enabled (2) bypass_depth : 0 nr_rejected : 0 + enable_seq : 1 If ``CONFIG_SCHED_DEBUG`` is set, whether a given task is on sched_ext can be determined as follows: diff --git a/kernel/sched/ext.c b/kernel/sched/ext.c index 7c320dcd72d5..c09e3dc38c34 100644 --- a/kernel/sched/ext.c +++ b/kernel/sched/ext.c @@ -875,6 +875,13 @@ static atomic_long_t scx_nr_rejected = ATOMIC_LONG_INIT(0); static atomic_long_t scx_hotplug_seq = ATOMIC_LONG_INIT(0); /* + * A monotically increasing sequence number that is incremented every time a + * scheduler is enabled. This can be used by to check if any custom sched_ext + * scheduler has ever been used in the system. + */ +static atomic_long_t scx_enable_seq = ATOMIC_LONG_INIT(0); + +/* * The maximum amount of time in jiffies that a task may be runnable without * being scheduled on a CPU. If this timeout is exceeded, it will trigger * scx_ops_error(). @@ -4154,11 +4161,19 @@ static ssize_t scx_attr_hotplug_seq_show(struct kobject *kobj, } SCX_ATTR(hotplug_seq); +static ssize_t scx_attr_enable_seq_show(struct kobject *kobj, + struct kobj_attribute *ka, char *buf) +{ + return sysfs_emit(buf, "%ld\n", atomic_long_read(&scx_enable_seq)); +} +SCX_ATTR(enable_seq); + static struct attribute *scx_global_attrs[] = { &scx_attr_state.attr, &scx_attr_switch_all.attr, &scx_attr_nr_rejected.attr, &scx_attr_hotplug_seq.attr, + &scx_attr_enable_seq.attr, NULL, }; @@ -5177,6 +5192,8 @@ static int scx_ops_enable(struct sched_ext_ops *ops, struct bpf_link *link) kobject_uevent(scx_root_kobj, KOBJ_ADD); mutex_unlock(&scx_ops_enable_mutex); + atomic_long_inc(&scx_enable_seq); + return 0; err_del: diff --git a/tools/sched_ext/scx_show_state.py b/tools/sched_ext/scx_show_state.py index d457d2a74e1e..8bc626ede1c4 100644 --- a/tools/sched_ext/scx_show_state.py +++ b/tools/sched_ext/scx_show_state.py @@ -37,3 +37,4 @@ print(f'switched_all : {read_static_key("__scx_switched_all")}') print(f'enable_state : {ops_state_str(enable_state)} ({enable_state})') print(f'bypass_depth : {read_atomic("scx_ops_bypass_depth")}') print(f'nr_rejected : {read_atomic("scx_nr_rejected")}') +print(f'enable_seq : {read_atomic("scx_enable_seq")}') |