diff options
Diffstat (limited to 'kernel/time/timer_migration.h')
| -rw-r--r-- | kernel/time/timer_migration.h | 36 |
1 files changed, 28 insertions, 8 deletions
diff --git a/kernel/time/timer_migration.h b/kernel/time/timer_migration.h index 70879cde6fdd..31735dd52327 100644 --- a/kernel/time/timer_migration.h +++ b/kernel/time/timer_migration.h @@ -6,6 +6,24 @@ #define TMIGR_CHILDREN_PER_GROUP 8 /** + * struct tmigr_hierarchy - a hierarchy associated to a given CPU capacity. + * Homogeneous systems have only one hierarchy. + * Heterogenous have one hierarchy per CPU capacity. + * @cpumask: CPUs belonging to this hierarchy + * @root: The current root of the hierarchy + * @capacity: CPU capacity associated to this hierarchy + * @node: Node in the global hierarchy list + * @level_list: Per level lists of tmigr groups + */ +struct tmigr_hierarchy { + struct cpumask *cpumask; + struct tmigr_group *root; + unsigned long capacity; + struct list_head node; + struct list_head level_list[]; +}; + +/** * struct tmigr_event - a timer event associated to a CPU * @nextevt: The node to enqueue an event in the parent group queue * @cpu: The CPU to which this event belongs @@ -75,15 +93,17 @@ struct tmigr_group { /** * struct tmigr_cpu - timer migration per CPU group * @lock: Lock protecting the tmigr_cpu group information - * @online: Indicates whether the CPU is online; In deactivate path - * it is required to know whether the migrator in the top - * level group is to be set offline, while a timer is - * pending. Then another online CPU needs to be notified to - * take over the migrator role. Furthermore the information - * is required in CPU hotplug path as the CPU is able to go - * idle before the timer migration hierarchy hotplug AP is - * reached. During this phase, the CPU has to handle the + * @available: Indicates whether the CPU is available for handling + * global timers. In the deactivate path it is required to + * know whether the migrator in the top level group is to + * be set offline, while a timer is pending. Then another + * available CPU needs to be notified to take over the + * migrator role. Furthermore the information is required + * in the CPU hotplug path as the CPU is able to go idle + * before the timer migration hierarchy hotplug callback is + * reached. During this phase, the CPU has to handle the * global timers on its own and must not act as a migrator. + * @idle: Indicates whether the CPU is idle in the timer migration * hierarchy * @remote: Is set when timers of the CPU are expired remotely |