[GIT PULL] scheduler fixes

Ingo Molnar
2013-12-02T14:44:07Z

Linus,

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

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

# HEAD: 96739d6e548e16d76de39d059e1e39e70c187fff sched/doc: Fix generation of device-drivers

Various smaller fixlets, all over the place.

Thanks,

Ingo

------------------>
Alex Shi (1):
sched: Remove unused variable in 'struct sched_domain'

Joe Perches (1):
MAINTAINERS: Update file patterns in the lockdep and scheduler entries

Nicolas Dichtel (1):
sched/doc: Fix generation of device-drivers

Peter Zijlstra (1):
sched: Avoid NULL dereference on sd_busy

Shigeru Yoshida (1):
sched: Fix a trivial typo in comments

Srikar Dronamraju (1):
sched: Check sched_domain before computing group power

Thomas Gleixner (1):
sched: Expose preempt_schedule_irq()

Documentation/DocBook/device-drivers.tmpl | 2 +-
MAINTAINERS | 3 +--
include/linux/sched.h | 2 --
kernel/sched/core.c | 8 ++++----
kernel/sched/fair.c | 27 ++++++++++++++++++++++++---
5 files changed, 30 insertions(+), 12 deletions(-)

diff --git a/Documentation/DocBook/device-drivers.tmpl b/Documentation/DocBook/device-drivers.tmpl
index 6c9d9d3..f517008 100644
--- a/Documentation/DocBook/device-drivers.tmpl
+++ b/Documentation/DocBook/device-drivers.tmpl
@@ -58,7 +58,7 @@
</sect1>
<sect1> Wait queues and Wake events
!Iinclude/linux/wait.h
-!Ekernel/wait.c
+!Ekernel/sched/wait.c
</sect1>
<sect1> High-resolution timers
!Iinclude/linux/ktime.h
diff --git a/MAINTAINERS b/MAINTAINERS
index f3ef1d1..3f85561 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -5236,7 +5236,7 @@ S: Maintained
F: Documentation/lockdep*.txt
F: Documentation/lockstat.txt
F: include/linux/lockdep.h
-F: kernel/lockdep*
+F: kernel/locking/

LOGICAL DISK MANAGER SUPPORT (LDM, Windows 2000/XP/Vista Dynamic Disks)
M: "Richard Russon (FlatCap)" <ldm@flatcap.org>
@@ -7361,7 +7361,6 @@ S: Maintained
F: kernel/sched/
F: include/linux/sched.h
F: include/uapi/linux/sched.h
-F: kernel/wait.c
F: include/linux/wait.h

SCORE ARCHITECTURE
diff --git a/include/linux/sched.h b/include/linux/sched.h
index f7efc86..b122395 100644
--- a/include/linux/sched.h
+++ b/include/linux/sched.h
@@ -823,8 +823,6 @@ struct sched_domain {
unsigned int balance_interval; /* initialise to 1. units in ms. */
unsigned int nr_balance_failed; /* initialise to 0 */

- u64 last_update;
-
/* idle_balance() stats */
u64 max_newidle_lb_cost;
unsigned long next_decay_max_lb_cost;
diff --git a/kernel/sched/core.c b/kernel/sched/core.c
index c180860..e85cda2 100644
--- a/kernel/sched/core.c
+++ b/kernel/sched/core.c
@@ -2660,6 +2660,7 @@ asmlinkage void __sched notrace preempt_schedule(void)
} while (need_resched());
}
EXPORT_SYMBOL(preempt_schedule);
+#endif /* CONFIG_PREEMPT */

/*
* this is the entry point to schedule() from kernel preemption
@@ -2693,8 +2694,6 @@ asmlinkage void __sched preempt_schedule_irq(void)
exception_exit(prev_state);
}

-#endif /* CONFIG_PREEMPT */
-
int default_wake_function(wait_queue_t *curr, unsigned mode, int wake_flags,
void *key)
{
@@ -4762,7 +4761,7 @@ static void rq_attach_root(struct rq *rq, struct root_domain *rd)
cpumask_clear_cpu(rq->cpu, old_rd->span);

/*
- * If we dont want to free the old_rt yet then
+ * If we dont want to free the old_rd yet then
* set old_rd to NULL to skip the freeing later
* in this function:
*/
@@ -4910,8 +4909,9 @@ static void update_top_cache_domain(int cpu)
if (sd) {
id = cpumask_first(sched_domain_span(sd));
size = cpumask_weight(sched_domain_span(sd));
- rcu_assign_pointer(per_cpu(sd_busy, cpu), sd->parent);
+ sd = sd->parent; /* sd_busy */
}
+ rcu_assign_pointer(per_cpu(sd_busy, cpu), sd);

rcu_assign_pointer(per_cpu(sd_llc, cpu), sd);
per_cpu(sd_llc_size, cpu) = size;
diff --git a/kernel/sched/fair.c b/kernel/sched/fair.c
index e8b652e..fd773ad 100644
--- a/kernel/sched/fair.c
+++ b/kernel/sched/fair.c
@@ -5379,10 +5379,31 @@ void update_group_power(struct sched_domain *sd, int cpu)
*/

for_each_cpu(cpu, sched_group_cpus(sdg)) {
- struct sched_group *sg = cpu_rq(cpu)->sd->groups;
+ struct sched_group_power *sgp;
+ struct rq *rq = cpu_rq(cpu);

- power_orig += sg->sgp->power_orig;
- power += sg->sgp->power;
+ /*
+ * build_sched_domains() -> init_sched_groups_power()
+ * gets here before we've attached the domains to the
+ * runqueues.
+ *
+ * Use power_of(), which is set irrespective of domains
+ * in update_cpu_power().
+ *
+ * This avoids power/power_orig from being 0 and
+ * causing divide-by-zero issues on boot.
+ *
+ * Runtime updates will correct power_orig.
+ */
+ if (unlikely(!rq->sd)) {
+ power_orig += power_of(cpu);
+ power += power_of(cpu);
+ continue;
+ }
+
+ sgp = rq->sd->groups->sgp;
+ power_orig += sgp->power_orig;
+ power += sgp->power;
}
} else {
/*