[GIT PULL] scheduler fixes

Ingo Molnar
2011-01-07T17:00:48Z

Linus,

Please pull the latest sched-fixes-for-linus git tree from:

git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip.git sched-fixes-for-linus

This also includes a commit to fix the function-local statics you noticed yesterday.

Thanks,

Ingo

------------------>
Hillf Danton (1):
sched: Fix strncmp operation

Mike Galbraith (2):
sched: Fix struct autogroup memory leak
sched: Move sched_autogroup_exit() to free_signal_struct()

Peter Zijlstra (1):
sched: Constify function scope static struct sched_param usage

Yong Zhang (2):
sched: Consolidate the name of root_task_group and init_task_group
sched: Mark autogroup_init() __init

include/linux/sched.h | 2 +-
kernel/fork.c | 7 ++---
kernel/irq/manage.c | 2 +-
kernel/kthread.c | 2 +-
kernel/sched.c | 45 ++++++++++++++++++++---------------------
kernel/sched_autogroup.c | 8 +++---
kernel/softirq.c | 2 +-
kernel/trace/trace_selftest.c | 2 +-
8 files changed, 34 insertions(+), 36 deletions(-)

diff --git a/include/linux/sched.h b/include/linux/sched.h
index 777cd01..341acbb 100644
--- a/include/linux/sched.h
+++ b/include/linux/sched.h
@@ -2511,7 +2511,7 @@ 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/fork.c b/kernel/fork.c
index 7d164e2..dc1a8bb 100644
--- a/kernel/fork.c
+++ b/kernel/fork.c
@@ -169,15 +169,14 @@ EXPORT_SYMBOL(free_task);
static inline void free_signal_struct(struct signal_struct *sig)
{
taskstats_tgid_free(sig);
+ sched_autogroup_exit(sig);
kmem_cache_free(signal_cachep, sig);
}

static inline void put_signal_struct(struct signal_struct *sig)
{
- if (atomic_dec_and_test(&sig->sigcnt)) {
- sched_autogroup_exit(sig);
+ if (atomic_dec_and_test(&sig->sigcnt))
free_signal_struct(sig);
- }
}

void __put_task_struct(struct task_struct *tsk)
@@ -1318,7 +1317,7 @@ bad_fork_cleanup_mm:
}
bad_fork_cleanup_signal:
if (!(clone_flags & CLONE_THREAD))
- put_signal_struct(p->signal);
+ free_signal_struct(p->signal);
bad_fork_cleanup_sighand:
__cleanup_sighand(p->sighand);
bad_fork_cleanup_fs:
diff --git a/kernel/irq/manage.c b/kernel/irq/manage.c
index 91a5fa2..0caa59f 100644
--- a/kernel/irq/manage.c
+++ b/kernel/irq/manage.c
@@ -577,7 +577,7 @@ irq_thread_check_affinity(struct irq_desc *desc, struct irqaction *action) { }
*/
static int irq_thread(void *data)
{
- static struct sched_param param = {
+ static const struct sched_param param = {
.sched_priority = MAX_USER_RT_PRIO/2,
};
struct irqaction *action = data;
diff --git a/kernel/kthread.c b/kernel/kthread.c
index 5355cfd..c55afba 100644
--- a/kernel/kthread.c
+++ b/kernel/kthread.c
@@ -148,7 +148,7 @@ struct task_struct *kthread_create(int (*threadfn)(void *data),
wait_for_completion(&create.done);

if (!IS_ERR(create.result)) {
- static struct sched_param param = { .sched_priority = 0 };
+ static const struct sched_param param = { .sched_priority = 0 };
va_list args;

va_start(args, namefmt);
diff --git a/kernel/sched.c b/kernel/sched.c
index 0494908..a0eb094 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 */

@@ -743,7 +741,7 @@ sched_feat_write(struct file *filp, const char __user *ubuf,
buf[cnt] = 0;
cmp = strstrip(buf);

- if (strncmp(buf, "NO_", 3) == 0) {
+ if (strncmp(cmp, "NO_", 3) == 0) {
neg = 1;
cmp += 3;
}
@@ -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++)
@@ -8379,6 +8377,7 @@ static void free_sched_group(struct task_group *tg)
{
free_fair_sched_group(tg);
free_rt_sched_group(tg);
+ autogroup_free(tg);
kfree(tg);
}

@@ -8812,7 +8811,7 @@ 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..32a723b 100644
--- a/kernel/sched_autogroup.c
+++ b/kernel/sched_autogroup.c
@@ -9,10 +9,10 @@ unsigned int __read_mostly sysctl_sched_autogroup_enabled = 1;
static struct autogroup autogroup_default;
static atomic_t autogroup_seq_nr;

-static void autogroup_init(struct task_struct *init_task)
+static void __init 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;
diff --git a/kernel/softirq.c b/kernel/softirq.c
index d4d918a..c10150c 100644
--- a/kernel/softirq.c
+++ b/kernel/softirq.c
@@ -853,7 +853,7 @@ static int __cpuinit cpu_callback(struct notifier_block *nfb,
cpumask_any(cpu_online_mask));
case CPU_DEAD:
case CPU_DEAD_FROZEN: {
- static struct sched_param param = {
+ static const struct sched_param param = {
.sched_priority = MAX_RT_PRIO-1
};

diff --git a/kernel/trace/trace_selftest.c b/kernel/trace/trace_selftest.c
index 562c56e..659732e 100644
--- a/kernel/trace/trace_selftest.c
+++ b/kernel/trace/trace_selftest.c
@@ -558,7 +558,7 @@ trace_selftest_startup_nop(struct tracer *trace, struct trace_array *tr)
static int trace_wakeup_test_thread(void *data)
{
/* Make this a RT thread, doesn't need to be too high */
- static struct sched_param param = { .sched_priority = 5 };
+ static const struct sched_param param = { .sched_priority = 5 };
struct completion *x = data;

sched_setscheduler(current, SCHED_FIFO, &param);