1/6: numtasks_init
Hooks up with Resource Groups core by defining the basic alloc/free
functions and registering the controller with the core.
--
Signed-Off-By: Chandra Seetharaman <[email protected]>
Signed-Off-By: Matt Helsley <[email protected]>
init/Kconfig | 10 ++++
kernel/res_group/Makefile | 1
kernel/res_group/numtasks.c | 90 ++++++++++++++++++++++++++++++++++++++++++++
3 files changed, 101 insertions(+)
Index: linux-2617-rc3/kernel/res_group/Makefile
===================================================================
--- linux-2617-rc3.orig/kernel/res_group/Makefile 2006-04-27 10:14:38.000000000 -0700
+++ linux-2617-rc3/kernel/res_group/Makefile 2006-04-27 10:18:49.000000000 -0700
@@ -1,2 +1,3 @@
obj-y = res_group.o shares.o task.o
+obj-$(CONFIG_RES_GROUPS_NUMTASKS) += numtasks.o
obj-$(CONFIG_RGCS) += rgcs.o
Index: linux-2617-rc3/kernel/res_group/numtasks.c
===================================================================
--- /dev/null 1970-01-01 00:00:00.000000000 +0000
+++ linux-2617-rc3/kernel/res_group/numtasks.c 2006-04-27 10:18:49.000000000 -0700
@@ -0,0 +1,90 @@
+/* numtasks.c - "Number of tasks" resource controller for Resource Groups
+ *
+ * Copyright (C) Chandra Seetharaman, IBM Corp. 2003-2006
+ * (C) Matt Helsley, IBM Corp. 2006
+ *
+ * Latest version, more details at http://ckrm.sf.net
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ */
+
+/*
+ * Resource controller for tracking number of tasks in a resource group.
+ */
+#include <linux/module.h>
+#include <linux/res_group_rc.h>
+
+static const char res_ctlr_name[] = "numtasks";
+
+struct numtasks {
+ struct res_shares shares;
+};
+
+struct res_controller numtasks_ctlr;
+
+static struct numtasks *get_shares_numtasks(struct res_shares *shares)
+{
+ if (shares)
+ return container_of(shares, struct numtasks, shares);
+ return NULL;
+}
+
+/* Initialize share struct values */
+static void numtasks_res_init_one(struct numtasks *numtasks_res)
+{
+ numtasks_res->shares.min_shares = SHARE_DONT_CARE;
+ numtasks_res->shares.max_shares = SHARE_DONT_CARE;
+ numtasks_res->shares.child_shares_divisor = SHARE_DEFAULT_DIVISOR;
+ numtasks_res->shares.unused_min_shares = SHARE_DEFAULT_DIVISOR;
+}
+
+static struct res_shares *numtasks_alloc_shares_struct(
+ struct resource_group *rgroup)
+{
+ struct numtasks *res;
+
+ res = kzalloc(sizeof(struct numtasks), GFP_KERNEL);
+ if (!res)
+ return NULL;
+ numtasks_res_init_one(res);
+ return &res->shares;
+}
+
+/*
+ * No locking of this resource group object necessary as we are not
+ * supposed to be assigned (or used) when/after this function is called.
+ */
+static void numtasks_free_shares_struct(struct res_shares *my_res)
+{
+ kfree(get_shares_numtasks(my_res));
+}
+
+struct res_controller numtasks_ctlr = {
+ .name = res_ctlr_name,
+ .depth_supported = 3,
+ .ctlr_id = NO_RES_ID,
+ .alloc_shares_struct = numtasks_alloc_shares_struct,
+ .free_shares_struct = numtasks_free_shares_struct,
+};
+
+int __init init_numtasks_res(void)
+{
+ if (numtasks_ctlr.ctlr_id != NO_RES_ID)
+ return -EBUSY; /* already registered */
+ return register_controller(&numtasks_ctlr);
+}
+
+void __exit exit_numtasks_res(void)
+{
+ int rc;
+ do {
+ rc = unregister_controller(&numtasks_ctlr);
+ } while (rc == -EBUSY);
+ BUG_ON(rc != 0);
+}
+module_init(init_numtasks_res)
+module_exit(exit_numtasks_res)
Index: linux-2617-rc3/init/Kconfig
===================================================================
--- linux-2617-rc3.orig/init/Kconfig 2006-04-27 10:17:11.000000000 -0700
+++ linux-2617-rc3/init/Kconfig 2006-04-27 10:18:49.000000000 -0700
@@ -175,6 +175,16 @@ config RGCS
Say M if unsure, Y to save on module loading. N doesn't make sense
when Resource Groups has been configured.
+config RES_GROUPS_NUMTASKS
+ bool "Number of Tasks Resource Controller"
+ depends on RES_GROUPS
+ default y
+ help
+ Provides a Resource Controller for Resource Groups that allows
+ limiting number of tasks a resource group can have.
+
+ Say N if unsure, Y to use the feature.
+
endmenu
config SYSCTL
bool "Sysctl support"
--
----------------------------------------------------------------------
Chandra Seetharaman | Be careful what you choose....
- [email protected] | .......you may get it.
----------------------------------------------------------------------
-
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