This patch puts the CPU resource controller into SUBCPUSETS framework.
With this patch, we can control the CPU resource from the cpuset
filesystem.
Signed-off-by: KUROSAWA Takahiro <[email protected]>
--- from-0005/init/Kconfig
+++ to-work/init/Kconfig 2005-09-07 20:49:02.766634348 +0900
@@ -249,6 +249,7 @@ config SUBCPUSETS
config CPU_RC
bool "CPU resource controller"
+ depends on SUBCPUSETS
help
This options will let you control the CPU resource by scaling
the timeslice allocated for each tasks.
--- from-0005/kernel/cpu_rc.c
+++ to-work/kernel/cpu_rc.c 2005-09-07 19:41:08.189485000 +0900
@@ -230,6 +230,137 @@ void cpu_rc_collect_hunger(task_t *tsk)
tsk->last_activated = 0;
}
+/*
+ * interface functions for subcpuset
+ */
+static void *cpu_rc_create_toplevel(struct cpuset *cs,
+ cpumask_t cpus, nodemask_t mems)
+{
+ struct cpu_rc_toplevel *top;
+ int i;
+
+ if (cpus_empty(cpus)) {
+ return NULL;
+ }
+
+ top = kmalloc(sizeof(*top), GFP_KERNEL);
+ if (top == NULL) {
+ return NULL;
+ }
+
+ top->cs = cs;
+ top->cpus = cpus;
+ top->shares = CPU_RC_GUAR_SCALE;
+ spin_lock_init(&top->lock);
+ top->hungry_groups = 0;
+
+ top->numcpus = 0;
+ for_each_cpu_mask(i, cpus) {
+ top->numcpus++;
+ }
+
+ return top;
+}
+
+static void cpu_rc_destroy_toplevel(void *top)
+{
+ kfree(top);
+}
+
+static void *cpu_rc_create(void *top, struct cpuset *cs)
+{
+ struct cpu_rc *cr;
+
+ cr = kmalloc(sizeof(*cr), GFP_KERNEL);
+ if (cr == NULL) {
+ return NULL;
+ }
+
+ memset(cr, 0, sizeof(*cr));
+ cr->top = top;
+ cr->ts_factor = CPU_RC_TSFACTOR_MAX;
+
+ return cr;
+}
+
+static void cpu_rc_destroy(void *p)
+{
+ struct cpu_rc *cr = p;
+
+ cpu_rc_lock(cr);
+ cpu_rc_set_satisfied(cr);
+ cpu_rc_unlock(cr);
+
+ kfree(p);
+}
+
+static int cpu_rc_set_guar(void *ctldata, unsigned long val)
+{
+ struct cpu_rc *cr = ctldata;
+
+ if (cr == NULL) {
+ return -EINVAL;
+ }
+
+ cpu_rc_lock(cr);
+ if (cr->top->shares + cr->guarantee < val) {
+ cpu_rc_unlock(cr);
+ return -ENOSPC;
+ }
+
+ cr->top->shares += cr->guarantee;
+ cr->top->shares -= val;
+ cr->guarantee = val;
+ cpu_rc_unlock(cr);
+
+ return 0;
+}
+
+static int cpu_rc_get_cur(void *ctldata, unsigned long *valp)
+{
+ struct cpu_rc *cr = ctldata;
+ unsigned int load;
+ int i, n;
+
+ if (cr == NULL) {
+ return -EINVAL;
+ }
+
+ load = 0;
+ n = 0;
+
+ /* Just displaying the value, so no locking... */
+ for_each_cpu_mask(i, cr->top->cpus) {
+ load += cr->stat[i].load;
+ n++;
+ }
+
+ *valp = load / n * CPU_RC_GUAR_SCALE / CPU_RC_LOAD_SCALE;
+
+ return 0;
+}
+
+static struct subcpuset_ctlr cpu_rc_ctlr = {
+ .name = "cpu",
+ .create_toplevel = cpu_rc_create_toplevel,
+ .destroy_toplevel = cpu_rc_destroy_toplevel,
+ .create = cpu_rc_create,
+ .destroy = cpu_rc_destroy,
+ .set_lim = NULL,
+ .set_guar = cpu_rc_set_guar,
+ .get_cur = cpu_rc_get_cur,
+};
+
void cpu_rc_init(void)
{
+ int err;
+ err = subcpuset_register_controller(&cpu_rc_ctlr);
+ if (err) {
+ printk(KERN_ERR "cpu_rc: register to subcpuset failed\n");
+ }
+}
+
+static struct cpu_rc *cpu_rc_get(task_t *tsk)
+{
+ return subcpuset_get_controller_data(tsk->cpuset, &cpu_rc_ctlr);
}
-
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