6/9: cpu_init
Adds the basic functions and registering the CPU controller to resource group.
Signed-off-by: MAEDA Naoaki <[email protected]>
Signed-off-by: Kurosawa Takahiro <[email protected]>
init/Kconfig | 10 +++
kernel/res_group/Makefile | 1
kernel/res_group/cpu.c | 142 ++++++++++++++++++++++++++++++++++++++++++++++
3 files changed, 153 insertions(+)
Index: linux-2.6.17-rc3/init/Kconfig
===================================================================
--- linux-2.6.17-rc3.orig/init/Kconfig
+++ linux-2.6.17-rc3/init/Kconfig
@@ -185,6 +185,16 @@ config RES_GROUPS_NUMTASKS
Say N if unsure, Y to use the feature.
+config RES_GROUPS_CPU
+ bool "CPU Resource Controller"
+ select CPU_RC
+ depends on RES_GROUPS
+ default y
+ help
+ Provides a CPU Resource Controller for Resource Groups.
+
+ Say N if unsure, Y to use the feature.
+
endmenu
config SYSCTL
bool "Sysctl support"
Index: linux-2.6.17-rc3/kernel/res_group/Makefile
===================================================================
--- linux-2.6.17-rc3.orig/kernel/res_group/Makefile
+++ linux-2.6.17-rc3/kernel/res_group/Makefile
@@ -1,3 +1,4 @@
obj-y = res_group.o shares.o task.o
obj-$(CONFIG_RES_GROUPS_NUMTASKS) += numtasks.o
+obj-$(CONFIG_RES_GROUPS_CPU) += cpu.o
obj-$(CONFIG_RGCS) += rgcs.o
Index: linux-2.6.17-rc3/kernel/res_group/cpu.c
===================================================================
--- /dev/null
+++ linux-2.6.17-rc3/kernel/res_group/cpu.c
@@ -0,0 +1,142 @@
+/*
+ * kernel/res_group/cpu.c
+ *
+ * CPU resource controller for Resource Groups
+ *
+ * Copyright 2005-2006 FUJITSU LIMITED
+ *
+ * This file is subject to the terms and conditions of the GNU General Public
+ * License. See the file COPYING in the main directory of the Linux
+ * distribution for more details.
+ */
+
+#include <linux/module.h>
+#include <linux/config.h>
+#include <linux/notifier.h>
+#include <linux/cpu.h>
+#include <linux/cpu_rc.h>
+#include <linux/res_group_rc.h>
+
+static const char res_ctlr_name[] = "cpu";
+
+struct cpu_res {
+ struct resource_group *rgroup; /* resouce group I belong to */
+ struct res_shares shares;
+ struct cpu_rc cpu_rc; /* cpu resource controller */
+ int cnt_total_min_shares;/* total min_shares behind the res_group */
+};
+
+static struct cpu_rc_domain grcd; /* system wide resource controller domain */
+struct res_controller cpu_ctlr;
+
+static struct cpu_res *get_shares_cpu(struct res_shares *shares)
+{
+ if (shares)
+ return container_of(shares, struct cpu_res, shares);
+ return NULL;
+}
+
+static struct cpu_res *get_res_group_cpu(struct resource_group *rgroup)
+{
+ return get_shares_cpu(get_controller_shares(rgroup, &cpu_ctlr));
+}
+
+struct cpu_rc *cpu_rc_get(task_t *tsk)
+{
+ struct resoruce_group *rgroup = tsk->res_group;
+ struct cpu_res *res;
+
+ /* controller is not registered; no resource group is given */
+ if ((cpu_ctlr.ctlr_id == NO_RES_ID) || (rgroup == NULL))
+ return NULL;
+
+ res = get_res_group_cpu(rgroup);
+ /* cpu controller is not available for this resource group */
+ if (!res)
+ return NULL;
+
+ return &res->cpu_rc;
+}
+
+static void cpu_res_init_one(struct cpu_res *cpu_res)
+{
+ cpu_res->shares.min_shares = 0;
+ cpu_res->shares.max_shares = SHARE_UNSUPPORTED;
+ cpu_res->shares.child_shares_divisor = SHARE_DEFAULT_DIVISOR;
+ cpu_res->shares.unused_min_shares = SHARE_DEFAULT_DIVISOR;
+
+ cpu_res->cnt_total_min_shares = 0;
+ cpu_rc_init_cr(&cpu_res->cpu_rc, &grcd);
+ cpu_rc_get_cr(&cpu_res->cpu_rc);
+}
+
+static struct res_shares *cpu_alloc_shares_struct(
+ struct resource_group *rgroup)
+{
+ struct cpu_res *res;
+
+ res = kzalloc(sizeof(struct cpu), GFP_KERNEL);
+ if (!res)
+ return NULL;
+ res->rgroup = rgroup;
+ cpu_res_init_one(res);
+ if (is_res_group_root(rgroup)) {
+ res->cpu_rc.share = SHARE_DEFAULT_DIVISOR;
+ res->cnt_total_min_shares = SHARE_DEFAULT_DIVISOR;
+ res->shares.min_shares = SHARE_DONT_CARE;
+ res->shares.max_shares = SHARE_DONT_CARE;
+ }
+ return &res->shares;
+}
+
+static void cpu_free_shares_struct(struct res_shares *my_res)
+{
+ struct cpu_res *res, *parres;
+ u64 temp = 0;
+
+ res = get_shares_cpu(my_res);
+ if (!res)
+ return;
+
+ parres = get_res_group_cpu(res->rgroup->parent);
+ /* return child's min_shares to parent resource group */
+ spin_lock(&parres->rgroup->group_lock);
+ if (parres->shares.child_shares_divisor) {
+ temp = (u64) parres->shares.unused_min_shares
+ * parres->cnt_total_min_shares;
+ do_div(temp, parres->shares.child_shares_divisor);
+ }
+ cpu_rc_set_share(&parres->cpu_rc, (int)temp);
+ spin_unlock(&parres->rgroup->group_lock);
+
+ cpu_rc_put_cr(&res->cpu_rc);
+ kfree(res);
+}
+
+struct res_controller cpu_ctlr = {
+ .name = res_ctlr_name,
+ .depth_supported = 3,
+ .ctlr_id = NO_RES_ID,
+ .alloc_shares_struct = cpu_alloc_shares_struct,
+ .free_shares_struct = cpu_free_shares_struct,
+};
+
+int __init init_cpu_res(void)
+{
+ if (cpu_ctlr.ctlr_id != NO_RES_ID)
+ return -EBUSY; /* already registered */
+ cpu_rc_init_rcd(&grcd);
+ return register_controller(&cpu_ctlr);
+}
+
+void __exit exit_cpu_res(void)
+{
+ int rc;
+ do {
+ rc = unregister_controller(&cpu_ctlr);
+ } while (rc == -EBUSY);
+ BUG_ON(rc != 0);
+}
+
+module_init(init_cpu_res)
+module_exit(exit_cpu_res)
-
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