summaryrefslogtreecommitdiff
path: root/include
diff options
context:
space:
mode:
authorLinus Torvalds <torvalds@linux-foundation.org>2012-03-20 21:31:44 +0400
committerLinus Torvalds <torvalds@linux-foundation.org>2012-03-20 21:31:44 +0400
commit2ba68940c893c8f0bfc8573c041254251bb6aeab (patch)
treefa83ebb01d32abd98123fa28f9f6f0b3eaeee25d /include
parent9c2b957db1772ebf942ae7a9346b14eba6c8ca66 (diff)
parent600e145882802d6ccbfe2c4aea243d97caeb91a9 (diff)
downloadlinux-2ba68940c893c8f0bfc8573c041254251bb6aeab.tar.xz
Merge branch 'sched-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip
Pull scheduler changes for v3.4 from Ingo Molnar * 'sched-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip: (27 commits) printk: Make it compile with !CONFIG_PRINTK sched/x86: Fix overflow in cyc2ns_offset sched: Fix nohz load accounting -- again! sched: Update yield() docs printk/sched: Introduce special printk_sched() for those awkward moments sched/nohz: Correctly initialize 'next_balance' in 'nohz' idle balancer sched: Cleanup cpu_active madness sched: Fix load-balance wreckage sched: Clean up parameter passing of proc_sched_autogroup_set_nice() sched: Ditch per cgroup task lists for load-balancing sched: Rename load-balancing fields sched: Move load-balancing arguments into helper struct sched/rt: Do not submit new work when PI-blocked sched/rt: Prevent idle task boosting sched/wait: Add __wake_up_all_locked() API sched/rt: Document scheduler related skip-resched-check sites sched/rt: Use schedule_preempt_disabled() sched/rt: Add schedule_preempt_disabled() sched/rt: Do not throttle when PI boosting sched/rt: Keep period timer ticking when rt throttling is active ...
Diffstat (limited to 'include')
-rw-r--r--include/linux/init_task.h2
-rw-r--r--include/linux/kernel.h13
-rw-r--r--include/linux/preempt.h5
-rw-r--r--include/linux/printk.h10
-rw-r--r--include/linux/sched.h41
-rw-r--r--include/linux/wait.h5
6 files changed, 65 insertions, 11 deletions
diff --git a/include/linux/init_task.h b/include/linux/init_task.h
index 9c66b1ada9d7..f994d51f70f2 100644
--- a/include/linux/init_task.h
+++ b/include/linux/init_task.h
@@ -149,7 +149,7 @@ extern struct cred init_cred;
}, \
.rt = { \
.run_list = LIST_HEAD_INIT(tsk.rt.run_list), \
- .time_slice = HZ, \
+ .time_slice = RR_TIMESLICE, \
.nr_cpus_allowed = NR_CPUS, \
}, \
.tasks = LIST_HEAD_INIT(tsk.tasks), \
diff --git a/include/linux/kernel.h b/include/linux/kernel.h
index e8343422240a..d801acb5e680 100644
--- a/include/linux/kernel.h
+++ b/include/linux/kernel.h
@@ -85,6 +85,19 @@
} \
)
+/*
+ * Multiplies an integer by a fraction, while avoiding unnecessary
+ * overflow or loss of precision.
+ */
+#define mult_frac(x, numer, denom)( \
+{ \
+ typeof(x) quot = (x) / (denom); \
+ typeof(x) rem = (x) % (denom); \
+ (quot * (numer)) + ((rem * (numer)) / (denom)); \
+} \
+)
+
+
#define _RET_IP_ (unsigned long)__builtin_return_address(0)
#define _THIS_IP_ ({ __label__ __here; __here: (unsigned long)&&__here; })
diff --git a/include/linux/preempt.h b/include/linux/preempt.h
index 58969b2a8a82..5a710b9c578e 100644
--- a/include/linux/preempt.h
+++ b/include/linux/preempt.h
@@ -48,12 +48,14 @@ do { \
barrier(); \
} while (0)
-#define preempt_enable_no_resched() \
+#define sched_preempt_enable_no_resched() \
do { \
barrier(); \
dec_preempt_count(); \
} while (0)
+#define preempt_enable_no_resched() sched_preempt_enable_no_resched()
+
#define preempt_enable() \
do { \
preempt_enable_no_resched(); \
@@ -92,6 +94,7 @@ do { \
#else /* !CONFIG_PREEMPT_COUNT */
#define preempt_disable() do { } while (0)
+#define sched_preempt_enable_no_resched() do { } while (0)
#define preempt_enable_no_resched() do { } while (0)
#define preempt_enable() do { } while (0)
diff --git a/include/linux/printk.h b/include/linux/printk.h
index f0e22f75143f..1f77a4174ee0 100644
--- a/include/linux/printk.h
+++ b/include/linux/printk.h
@@ -101,6 +101,11 @@ asmlinkage __printf(1, 2) __cold
int printk(const char *fmt, ...);
/*
+ * Special printk facility for scheduler use only, _DO_NOT_USE_ !
+ */
+__printf(1, 2) __cold int printk_sched(const char *fmt, ...);
+
+/*
* Please don't use printk_ratelimit(), because it shares ratelimiting state
* with all other unrelated printk_ratelimit() callsites. Instead use
* printk_ratelimited() or plain old __ratelimit().
@@ -127,6 +132,11 @@ int printk(const char *s, ...)
{
return 0;
}
+static inline __printf(1, 2) __cold
+int printk_sched(const char *s, ...)
+{
+ return 0;
+}
static inline int printk_ratelimit(void)
{
return 0;
diff --git a/include/linux/sched.h b/include/linux/sched.h
index e345163da657..e074e1e54f85 100644
--- a/include/linux/sched.h
+++ b/include/linux/sched.h
@@ -361,6 +361,7 @@ extern signed long schedule_timeout_interruptible(signed long timeout);
extern signed long schedule_timeout_killable(signed long timeout);
extern signed long schedule_timeout_uninterruptible(signed long timeout);
asmlinkage void schedule(void);
+extern void schedule_preempt_disabled(void);
extern int mutex_spin_on_owner(struct mutex *lock, struct task_struct *owner);
struct nsproxy;
@@ -905,6 +906,7 @@ struct sched_group_power {
* single CPU.
*/
unsigned int power, power_orig;
+ unsigned long next_update;
/*
* Number of busy cpus in this group.
*/
@@ -1052,6 +1054,8 @@ static inline int test_sd_parent(struct sched_domain *sd, int flag)
unsigned long default_scale_freq_power(struct sched_domain *sd, int cpu);
unsigned long default_scale_smt_power(struct sched_domain *sd, int cpu);
+bool cpus_share_cache(int this_cpu, int that_cpu);
+
#else /* CONFIG_SMP */
struct sched_domain_attr;
@@ -1061,6 +1065,12 @@ partition_sched_domains(int ndoms_new, cpumask_var_t doms_new[],
struct sched_domain_attr *dattr_new)
{
}
+
+static inline bool cpus_share_cache(int this_cpu, int that_cpu)
+{
+ return true;
+}
+
#endif /* !CONFIG_SMP */
@@ -1225,6 +1235,12 @@ struct sched_rt_entity {
#endif
};
+/*
+ * default timeslice is 100 msecs (used only for SCHED_RR tasks).
+ * Timeslices get refilled after they expire.
+ */
+#define RR_TIMESLICE (100 * HZ / 1000)
+
struct rcu_node;
enum perf_event_task_context {
@@ -2047,7 +2063,7 @@ extern void sched_autogroup_fork(struct signal_struct *sig);
extern void sched_autogroup_exit(struct signal_struct *sig);
#ifdef CONFIG_PROC_FS
extern void proc_sched_autogroup_show_task(struct task_struct *p, struct seq_file *m);
-extern int proc_sched_autogroup_set_nice(struct task_struct *p, int *nice);
+extern int proc_sched_autogroup_set_nice(struct task_struct *p, int nice);
#endif
#else
static inline void sched_autogroup_create_attach(struct task_struct *p) { }
@@ -2064,12 +2080,20 @@ extern unsigned int sysctl_sched_cfs_bandwidth_slice;
extern int rt_mutex_getprio(struct task_struct *p);
extern void rt_mutex_setprio(struct task_struct *p, int prio);
extern void rt_mutex_adjust_pi(struct task_struct *p);
+static inline bool tsk_is_pi_blocked(struct task_struct *tsk)
+{
+ return tsk->pi_blocked_on != NULL;
+}
#else
static inline int rt_mutex_getprio(struct task_struct *p)
{
return p->normal_prio;
}
# define rt_mutex_adjust_pi(p) do { } while (0)
+static inline bool tsk_is_pi_blocked(struct task_struct *tsk)
+{
+ return false;
+}
#endif
extern bool yield_to(struct task_struct *p, bool preempt);
@@ -2388,12 +2412,15 @@ static inline void task_unlock(struct task_struct *p)
extern struct sighand_struct *__lock_task_sighand(struct task_struct *tsk,
unsigned long *flags);
-#define lock_task_sighand(tsk, flags) \
-({ struct sighand_struct *__ss; \
- __cond_lock(&(tsk)->sighand->siglock, \
- (__ss = __lock_task_sighand(tsk, flags))); \
- __ss; \
-}) \
+static inline struct sighand_struct *lock_task_sighand(struct task_struct *tsk,
+ unsigned long *flags)
+{
+ struct sighand_struct *ret;
+
+ ret = __lock_task_sighand(tsk, flags);
+ (void)__cond_lock(&tsk->sighand->siglock, ret);
+ return ret;
+}
static inline void unlock_task_sighand(struct task_struct *tsk,
unsigned long *flags)
diff --git a/include/linux/wait.h b/include/linux/wait.h
index a9ce45e8501c..7d9a9e990ce6 100644
--- a/include/linux/wait.h
+++ b/include/linux/wait.h
@@ -157,7 +157,7 @@ void __wake_up(wait_queue_head_t *q, unsigned int mode, int nr, void *key);
void __wake_up_locked_key(wait_queue_head_t *q, unsigned int mode, void *key);
void __wake_up_sync_key(wait_queue_head_t *q, unsigned int mode, int nr,
void *key);
-void __wake_up_locked(wait_queue_head_t *q, unsigned int mode);
+void __wake_up_locked(wait_queue_head_t *q, unsigned int mode, int nr);
void __wake_up_sync(wait_queue_head_t *q, unsigned int mode, int nr);
void __wake_up_bit(wait_queue_head_t *, void *, int);
int __wait_on_bit(wait_queue_head_t *, struct wait_bit_queue *, int (*)(void *), unsigned);
@@ -170,7 +170,8 @@ wait_queue_head_t *bit_waitqueue(void *, int);
#define wake_up(x) __wake_up(x, TASK_NORMAL, 1, NULL)
#define wake_up_nr(x, nr) __wake_up(x, TASK_NORMAL, nr, NULL)
#define wake_up_all(x) __wake_up(x, TASK_NORMAL, 0, NULL)
-#define wake_up_locked(x) __wake_up_locked((x), TASK_NORMAL)
+#define wake_up_locked(x) __wake_up_locked((x), TASK_NORMAL, 1)
+#define wake_up_all_locked(x) __wake_up_locked((x), TASK_NORMAL, 0)
#define wake_up_interruptible(x) __wake_up(x, TASK_INTERRUPTIBLE, 1, NULL)
#define wake_up_interruptible_nr(x, nr) __wake_up(x, TASK_INTERRUPTIBLE, nr, NULL)