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Message-ID: <20110107071736.GA32635@windriver.com>
Date: Fri, 7 Jan 2011 15:17:36 +0800
From: Yong Zhang <yong.zhang0@...il.com>
To: Mike Galbraith <efault@....de>
Cc: linux-kernel@...r.kernel.org, Ingo Molnar <mingo@...e.hu>,
Peter Zijlstra <peterz@...radead.org>
Subject: [PATCH] sched: consolidate the name of root_task_group and
init_task_group
On Fri, Jan 07, 2011 at 06:42:30AM +0100, Mike Galbraith wrote:
> On Fri, 2011-01-07 at 12:43 +0800, Yong Zhang wrote:
> > root_task_group is the leftover of USER_SCHED, now it's always
> > same to init_task_group.
>
> Wouldn't the reverse be better? It's root as in tree.
Well, I have no bias to either of them. Keeping init_task_group is
just that we can touch less lines. :)
If you want root_task_group, here it is:
---
From: Yong Zhang <yong.zhang0@...il.com>
Subject: [PATCH] sched: consolidate the name of root_task_group and init_task_group
root_task_group is the leftover of USER_SCHED, now it's always
same to init_task_group.
But as Mike suggested, root_task_group is maybe the suitable name
to keep for a tree.
So in this patch:
init_task_group --> root_task_group
init_task_group_load --> root_task_group_load
INIT_TASK_GROUP_LOAD --> ROOT_TASK_GROUP_LOAD
Suggested-by: Mike Galbraith <efault@....de>
Signed-off-by: Yong Zhang <yong.zhang0@...il.com>
Cc: Ingo Molnar <mingo@...e.hu>
Cc: Peter Zijlstra <peterz@...radead.org>
---
include/linux/sched.h | 2 +-
kernel/sched.c | 42 ++++++++++++++++++++----------------------
kernel/sched_autogroup.c | 6 +++---
3 files changed, 24 insertions(+), 26 deletions(-)
diff --git a/include/linux/sched.h b/include/linux/sched.h
index 883ad10..a6b04a0 100644
--- a/include/linux/sched.h
+++ b/include/linux/sched.h
@@ -2500,7 +2500,7 @@ extern void normalize_rt_tasks(void);
#ifdef CONFIG_CGROUP_SCHED
-extern struct task_group init_task_group;
+extern struct task_group root_task_group;
extern struct task_group *sched_create_group(struct task_group *parent);
extern void sched_destroy_group(struct task_group *tg);
diff --git a/kernel/sched.c b/kernel/sched.c
index 114a0de..35a8046 100644
--- a/kernel/sched.c
+++ b/kernel/sched.c
@@ -278,14 +278,12 @@ struct task_group {
#endif
};
-#define root_task_group init_task_group
-
/* task_group_lock serializes the addition/removal of task groups */
static DEFINE_SPINLOCK(task_group_lock);
#ifdef CONFIG_FAIR_GROUP_SCHED
-# define INIT_TASK_GROUP_LOAD NICE_0_LOAD
+# define ROOT_TASK_GROUP_LOAD NICE_0_LOAD
/*
* A weight of 0 or 1 can cause arithmetics problems.
@@ -298,13 +296,13 @@ static DEFINE_SPINLOCK(task_group_lock);
#define MIN_SHARES 2
#define MAX_SHARES (1UL << 18)
-static int init_task_group_load = INIT_TASK_GROUP_LOAD;
+static int root_task_group_load = ROOT_TASK_GROUP_LOAD;
#endif
/* Default task group.
* Every task in system belong to this group at bootup.
*/
-struct task_group init_task_group;
+struct task_group root_task_group;
#endif /* CONFIG_CGROUP_SCHED */
@@ -7848,7 +7846,7 @@ static void init_tg_cfs_entry(struct task_group *tg, struct cfs_rq *cfs_rq,
cfs_rq->tg = tg;
tg->se[cpu] = se;
- /* se could be NULL for init_task_group */
+ /* se could be NULL for root_task_group */
if (!se)
return;
@@ -7908,18 +7906,18 @@ void __init sched_init(void)
ptr = (unsigned long)kzalloc(alloc_size, GFP_NOWAIT);
#ifdef CONFIG_FAIR_GROUP_SCHED
- init_task_group.se = (struct sched_entity **)ptr;
+ root_task_group.se = (struct sched_entity **)ptr;
ptr += nr_cpu_ids * sizeof(void **);
- init_task_group.cfs_rq = (struct cfs_rq **)ptr;
+ root_task_group.cfs_rq = (struct cfs_rq **)ptr;
ptr += nr_cpu_ids * sizeof(void **);
#endif /* CONFIG_FAIR_GROUP_SCHED */
#ifdef CONFIG_RT_GROUP_SCHED
- init_task_group.rt_se = (struct sched_rt_entity **)ptr;
+ root_task_group.rt_se = (struct sched_rt_entity **)ptr;
ptr += nr_cpu_ids * sizeof(void **);
- init_task_group.rt_rq = (struct rt_rq **)ptr;
+ root_task_group.rt_rq = (struct rt_rq **)ptr;
ptr += nr_cpu_ids * sizeof(void **);
#endif /* CONFIG_RT_GROUP_SCHED */
@@ -7939,13 +7937,13 @@ void __init sched_init(void)
global_rt_period(), global_rt_runtime());
#ifdef CONFIG_RT_GROUP_SCHED
- init_rt_bandwidth(&init_task_group.rt_bandwidth,
+ init_rt_bandwidth(&root_task_group.rt_bandwidth,
global_rt_period(), global_rt_runtime());
#endif /* CONFIG_RT_GROUP_SCHED */
#ifdef CONFIG_CGROUP_SCHED
- list_add(&init_task_group.list, &task_groups);
- INIT_LIST_HEAD(&init_task_group.children);
+ list_add(&root_task_group.list, &task_groups);
+ INIT_LIST_HEAD(&root_task_group.children);
autogroup_init(&init_task);
#endif /* CONFIG_CGROUP_SCHED */
@@ -7960,34 +7958,34 @@ void __init sched_init(void)
init_cfs_rq(&rq->cfs, rq);
init_rt_rq(&rq->rt, rq);
#ifdef CONFIG_FAIR_GROUP_SCHED
- init_task_group.shares = init_task_group_load;
+ root_task_group.shares = root_task_group_load;
INIT_LIST_HEAD(&rq->leaf_cfs_rq_list);
/*
- * How much cpu bandwidth does init_task_group get?
+ * How much cpu bandwidth does root_task_group get?
*
* In case of task-groups formed thr' the cgroup filesystem, it
* gets 100% of the cpu resources in the system. This overall
* system cpu resource is divided among the tasks of
- * init_task_group and its child task-groups in a fair manner,
+ * root_task_group and its child task-groups in a fair manner,
* based on each entity's (task or task-group's) weight
* (se->load.weight).
*
- * In other words, if init_task_group has 10 tasks of weight
+ * In other words, if root_task_group has 10 tasks of weight
* 1024) and two child groups A0 and A1 (of weight 1024 each),
* then A0's share of the cpu resource is:
*
* A0's bandwidth = 1024 / (10*1024 + 1024 + 1024) = 8.33%
*
- * We achieve this by letting init_task_group's tasks sit
- * directly in rq->cfs (i.e init_task_group->se[] = NULL).
+ * We achieve this by letting root_task_group's tasks sit
+ * directly in rq->cfs (i.e root_task_group->se[] = NULL).
*/
- init_tg_cfs_entry(&init_task_group, &rq->cfs, NULL, i, NULL);
+ init_tg_cfs_entry(&root_task_group, &rq->cfs, NULL, i, NULL);
#endif /* CONFIG_FAIR_GROUP_SCHED */
rq->rt.rt_runtime = def_rt_bandwidth.rt_runtime;
#ifdef CONFIG_RT_GROUP_SCHED
INIT_LIST_HEAD(&rq->leaf_rt_rq_list);
- init_tg_rt_entry(&init_task_group, &rq->rt, NULL, i, NULL);
+ init_tg_rt_entry(&root_task_group, &rq->rt, NULL, i, NULL);
#endif
for (j = 0; j < CPU_LOAD_IDX_MAX; j++)
@@ -8814,7 +8812,7 @@ cpu_cgroup_create(struct cgroup_subsys *ss, struct cgroup *cgrp)
if (!cgrp->parent) {
/* This is early initialization for the top cgroup */
- return &init_task_group.css;
+ return &root_task_group.css;
}
parent = cgroup_tg(cgrp->parent);
diff --git a/kernel/sched_autogroup.c b/kernel/sched_autogroup.c
index c80fedc..e011e53 100644
--- a/kernel/sched_autogroup.c
+++ b/kernel/sched_autogroup.c
@@ -11,8 +11,8 @@ static atomic_t autogroup_seq_nr;
static void autogroup_init(struct task_struct *init_task)
{
- autogroup_default.tg = &init_task_group;
- init_task_group.autogroup = &autogroup_default;
+ autogroup_default.tg = &root_task_group;
+ root_task_group.autogroup = &autogroup_default;
kref_init(&autogroup_default.kref);
init_rwsem(&autogroup_default.lock);
init_task->signal->autogroup = &autogroup_default;
@@ -63,7 +63,7 @@ static inline struct autogroup *autogroup_create(void)
if (!ag)
goto out_fail;
- tg = sched_create_group(&init_task_group);
+ tg = sched_create_group(&root_task_group);
if (IS_ERR(tg))
goto out_free;
--
1.7.0.4
--
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