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Subject[patch 28/38] CKRM e18: Cleanups to CKRM initialization
Handle the CKRM initialization only if the Taskclass classtype is built 
and set the initial class of the init process.

Signed-Off-By: Matt Helsley <matthltc@us.ibm.com>
Signed-Off-By: Gerrit Huizenga <gh@us.ibm.com>

---------------------------------------------------------------------
Index: linux-2.6.12-ckrm1/kernel/ckrm/ckrm.c
===================================================================
--- linux-2.6.12-ckrm1.orig/kernel/ckrm/ckrm.c 2005-06-20 15:02:49.000000000 -0700
+++ linux-2.6.12-ckrm1/kernel/ckrm/ckrm.c 2005-06-20 15:04:54.000000000 -0700
@@ -845,7 +845,10 @@ void __init ckrm_init(void)
#ifdef CONFIG_CKRM_TYPE_TASKCLASS
{
extern void ckrm_meta_init_taskclass(void);
+ ckrm_cb_newtask(&init_task);
ckrm_meta_init_taskclass();
+ /* prepare init_task and then rely on inheritance
+ of properties */
}
#endif
#ifdef CONFIG_CKRM_TYPE_SOCKETCLASS
@@ -854,8 +857,6 @@ void __init ckrm_init(void)
ckrm_meta_init_sockclass();
}
#endif
- /* prepare init_task and then rely on inheritance of properties */
- ckrm_cb_newtask(&init_task);
printk("CKRM Initialization done\n");
}

Index: linux-2.6.12-ckrm1/kernel/ckrm/ckrm_tc.c
===================================================================
--- linux-2.6.12-ckrm1.orig/kernel/ckrm/ckrm_tc.c 2005-06-20 15:02:49.000000000 -0700
+++ linux-2.6.12-ckrm1/kernel/ckrm/ckrm_tc.c 2005-06-20 15:04:54.000000000 -0700
@@ -35,6 +35,8 @@

#include <linux/ckrm_tc.h>

+#define TASK_EXIT_CLASS ((void*)-1)
+
static struct ckrm_task_class taskclass_dflt_class = {
};

@@ -112,14 +114,15 @@ ckrm_set_taskclass(struct task_struct *t
spin_lock(&tsk->ckrm_tsklock);
curcls = tsk->taskclass;

- if ((void *)-1 == curcls) {
+ if (TASK_EXIT_CLASS == curcls) {
/* task is disassociated from ckrm. Don't bother it. */
spin_unlock(&tsk->ckrm_tsklock);
- ckrm_core_drop(class_core(newcls));
+ if (newcls && (newcls != TASK_EXIT_CLASS))
+ ckrm_core_drop(class_core(newcls));
return;
}

- if ((curcls == NULL) && (newcls == (void *)-1)) {
+ if ((curcls == NULL) && (newcls == TASK_EXIT_CLASS)) {
/*
* Task needs to disassociated from ckrm and has no circles
* just disassociate and return.
@@ -130,7 +133,7 @@ ckrm_set_taskclass(struct task_struct *t
}
if (oldcls && (oldcls != curcls)) {
spin_unlock(&tsk->ckrm_tsklock);
- if (newcls) {
+ if (newcls && (newcls != TASK_EXIT_CLASS)) {
/* compensate for previous grab */
pr_debug("(%s:%d): Race-condition caught <%s> %d\n",
tsk->comm, tsk->pid, class_core(newcls)->name,
@@ -140,7 +143,7 @@ ckrm_set_taskclass(struct task_struct *t
return;
}
/* Make sure we have a real destination core. */
- if (!newcls) {
+ if (newcls == NULL) {
newcls = &taskclass_dflt_class;
ckrm_core_grab(class_core(newcls));
}
@@ -160,7 +163,7 @@ ckrm_set_taskclass(struct task_struct *t
INIT_LIST_HEAD(&tsk->taskclass_link);
tsk->taskclass = NULL;
class_unlock(class_core(curcls));
- if (newcls == (void *)-1) {
+ if (newcls == TASK_EXIT_CLASS) {
tsk->taskclass = newcls;
spin_unlock(&tsk->ckrm_tsklock);

@@ -223,7 +226,7 @@ static void tc_add_resctrl(struct ckrm_c
class_lock(core);
list_for_each_entry(tsk, &core->objlist, taskclass_link) {
if (rcbs->change_resclass)
- (*rcbs->change_resclass) (tsk, (void *)-1,
+ (*rcbs->change_resclass) (tsk, TASK_EXIT_CLASS,
core->res_class[resid]);
}
class_unlock(core);
@@ -289,7 +292,7 @@ static void cb_taskclass_exit(void *tsk1
struct task_struct *tsk = (struct task_struct *)tsk1;

CE_CLASSIFY_NORET(&ct_taskclass, CKRM_EVENT_EXIT, tsk);
- ckrm_set_taskclass(tsk, (void *)-1, NULL, CKRM_EVENT_EXIT);
+ ckrm_set_taskclass(tsk, TASK_EXIT_CLASS, NULL, CKRM_EVENT_EXIT);
}

static void cb_taskclass_exec(void *filename)
@@ -636,6 +639,9 @@ void __init ckrm_meta_init_taskclass(voi
* note registeration of all resource controllers will be done
* later dynamically as these are specified as modules
*/
+
+ /* prepare init_task and then rely on inheritance of properties */
+ ckrm_set_taskclass(&init_task, NULL, NULL, CKRM_EVENT_NEWTASK);
}

static int tc_show_members(struct ckrm_core_class *core, struct seq_file *seq)
--
-
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