8/9: ckrm_cpu_hotplug
Adds cpu hotplug notifier for the CKRM CPU controller.
Signed-off-by: MAEDA Naoaki <[email protected]>
Signed-off-by: Kurosawa Takahiro <[email protected]>
kernel/ckrm/ckrm_cpu.c | 50 +++++++++++++++++++++++++++++++++++++++++++++++++
1 files changed, 50 insertions(+)
Index: linux-2.6.17-rc2/kernel/ckrm/ckrm_cpu.c
===================================================================
--- linux-2.6.17-rc2.orig/kernel/ckrm/ckrm_cpu.c
+++ linux-2.6.17-rc2/kernel/ckrm/ckrm_cpu.c
@@ -243,12 +243,61 @@ struct ckrm_controller cpu_ctlr = {
.show_stats = cpu_show_stats,
};
+static void clear_stat_and_propagate(struct ckrm_cpu * res, int cpu)
+{
+ struct ckrm_class *child = NULL;
+ struct ckrm_cpu *childres;
+
+ cpu_rc_clear_stat(&res->cpu_rc, cpu);
+
+ /* propagate to children */
+ spin_lock(&res->class->class_lock);
+ for_each_child(child, res->class) {
+ childres = get_class_cpu(child);
+ if (childres) {
+ spin_lock(&child->class_lock);
+ clear_stat_and_propagate(childres, cpu);
+ spin_unlock(&child->class_lock);
+ }
+ }
+ spin_unlock(&res->class->class_lock);
+}
+
+static int __devinit ckrm_cpu_notify(struct notifier_block *self,
+ unsigned long action, void *hcpu)
+{
+ struct ckrm_class *cls = &ckrm_default_class;
+ struct ckrm_cpu *res;
+ int cpu = (long) hcpu;
+
+ switch (action) {
+
+ case CPU_DEAD:
+ res = get_class_cpu(cls);
+ clear_stat_and_propagate(res, cpu);
+ /* FALL THROUGH */
+ case CPU_ONLINE:
+ grcd.cpus = cpu_online_map;
+ grcd.numcpus = cpus_weight(cpu_online_map);
+ break;
+ default:
+ break;
+ }
+ return NOTIFY_OK;
+}
+
+static struct notifier_block ckrm_cpu_nb = {
+ .notifier_call = ckrm_cpu_notify,
+};
+
int __init init_ckrm_cpu_res(void)
{
if (cpu_ctlr.ctlr_id != CKRM_NO_RES_ID)
return -EBUSY; /* already registered */
cpu_rc_init_rcd(&grcd);
printk(KERN_INFO "init_ckrm_cpu_res %d cpus available\n", grcd.numcpus);
+ /* Register notifier for non-boot CPUs */
+ register_cpu_notifier(&ckrm_cpu_nb);
return ckrm_register_controller(&cpu_ctlr);
}
@@ -259,6 +308,7 @@ void __exit exit_ckrm_cpu_res(void)
rc = ckrm_unregister_controller(&cpu_ctlr);
} while (rc == -EBUSY);
BUG_ON(rc != 0);
+ unregister_cpu_notifier(&ckrm_cpu_nb);
}
module_init(init_ckrm_cpu_res)
-
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