[tip:sched/core] sched/core: Add wrappers for lockdep_(un)pin_lock()

From: tip-bot for Matt Fleming
Date: Sat Jan 14 2017 - 07:41:54 EST


Commit-ID: d8ac897137a230ec351269f6378017f2decca512
Gitweb: http://git.kernel.org/tip/d8ac897137a230ec351269f6378017f2decca512
Author: Matt Fleming <matt@xxxxxxxxxxxxxxxxxxx>
AuthorDate: Wed, 21 Sep 2016 14:38:10 +0100
Committer: Ingo Molnar <mingo@xxxxxxxxxx>
CommitDate: Sat, 14 Jan 2017 11:29:30 +0100

sched/core: Add wrappers for lockdep_(un)pin_lock()

In preparation for adding diagnostic checks to catch missing calls to
update_rq_clock(), provide wrappers for (re)pinning and unpinning
rq->lock.

Because the pending diagnostic checks allow state to be maintained in
rq_flags across pin contexts, swap the 'struct pin_cookie' arguments
for 'struct rq_flags *'.

Signed-off-by: Matt Fleming <matt@xxxxxxxxxxxxxxxxxxx>
Signed-off-by: Peter Zijlstra (Intel) <peterz@xxxxxxxxxxxxx>
Cc: Byungchul Park <byungchul.park@xxxxxxx>
Cc: Frederic Weisbecker <fweisbec@xxxxxxxxx>
Cc: Jan Kara <jack@xxxxxxx>
Cc: Linus Torvalds <torvalds@xxxxxxxxxxxxxxxxxxxx>
Cc: Luca Abeni <luca.abeni@xxxxxxxx>
Cc: Mel Gorman <mgorman@xxxxxxxxxxxxxxxxxxx>
Cc: Mike Galbraith <efault@xxxxxx>
Cc: Mike Galbraith <umgwanakikbuti@xxxxxxxxx>
Cc: Peter Zijlstra <peterz@xxxxxxxxxxxxx>
Cc: Petr Mladek <pmladek@xxxxxxxx>
Cc: Rik van Riel <riel@xxxxxxxxxx>
Cc: Sergey Senozhatsky <sergey.senozhatsky.work@xxxxxxxxx>
Cc: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
Cc: Wanpeng Li <wanpeng.li@xxxxxxxxxxx>
Cc: Yuyang Du <yuyang.du@xxxxxxxxx>
Link: http://lkml.kernel.org/r/20160921133813.31976-5-matt@xxxxxxxxxxxxxxxxxxx
Signed-off-by: Ingo Molnar <mingo@xxxxxxxxxx>
---
kernel/sched/core.c | 80 ++++++++++++++++++++++++------------------------
kernel/sched/deadline.c | 10 +++---
kernel/sched/fair.c | 6 ++--
kernel/sched/idle_task.c | 2 +-
kernel/sched/rt.c | 6 ++--
kernel/sched/sched.h | 31 ++++++++++++++-----
kernel/sched/stop_task.c | 2 +-
7 files changed, 76 insertions(+), 61 deletions(-)

diff --git a/kernel/sched/core.c b/kernel/sched/core.c
index c56fb57..41df935 100644
--- a/kernel/sched/core.c
+++ b/kernel/sched/core.c
@@ -185,7 +185,7 @@ struct rq *__task_rq_lock(struct task_struct *p, struct rq_flags *rf)
rq = task_rq(p);
raw_spin_lock(&rq->lock);
if (likely(rq == task_rq(p) && !task_on_rq_migrating(p))) {
- rf->cookie = lockdep_pin_lock(&rq->lock);
+ rq_pin_lock(rq, rf);
return rq;
}
raw_spin_unlock(&rq->lock);
@@ -225,7 +225,7 @@ struct rq *task_rq_lock(struct task_struct *p, struct rq_flags *rf)
* pair with the WMB to ensure we must then also see migrating.
*/
if (likely(rq == task_rq(p) && !task_on_rq_migrating(p))) {
- rf->cookie = lockdep_pin_lock(&rq->lock);
+ rq_pin_lock(rq, rf);
return rq;
}
raw_spin_unlock(&rq->lock);
@@ -1195,9 +1195,9 @@ static int __set_cpus_allowed_ptr(struct task_struct *p,
* OK, since we're going to drop the lock immediately
* afterwards anyway.
*/
- lockdep_unpin_lock(&rq->lock, rf.cookie);
+ rq_unpin_lock(rq, &rf);
rq = move_queued_task(rq, p, dest_cpu);
- lockdep_repin_lock(&rq->lock, rf.cookie);
+ rq_repin_lock(rq, &rf);
}
out:
task_rq_unlock(rq, p, &rf);
@@ -1690,7 +1690,7 @@ static inline void ttwu_activate(struct rq *rq, struct task_struct *p, int en_fl
* Mark the task runnable and perform wakeup-preemption.
*/
static void ttwu_do_wakeup(struct rq *rq, struct task_struct *p, int wake_flags,
- struct pin_cookie cookie)
+ struct rq_flags *rf)
{
check_preempt_curr(rq, p, wake_flags);
p->state = TASK_RUNNING;
@@ -1702,9 +1702,9 @@ static void ttwu_do_wakeup(struct rq *rq, struct task_struct *p, int wake_flags,
* Our task @p is fully woken up and running; so its safe to
* drop the rq->lock, hereafter rq is only used for statistics.
*/
- lockdep_unpin_lock(&rq->lock, cookie);
+ rq_unpin_lock(rq, rf);
p->sched_class->task_woken(rq, p);
- lockdep_repin_lock(&rq->lock, cookie);
+ rq_repin_lock(rq, rf);
}

if (rq->idle_stamp) {
@@ -1723,7 +1723,7 @@ static void ttwu_do_wakeup(struct rq *rq, struct task_struct *p, int wake_flags,

static void
ttwu_do_activate(struct rq *rq, struct task_struct *p, int wake_flags,
- struct pin_cookie cookie)
+ struct rq_flags *rf)
{
int en_flags = ENQUEUE_WAKEUP;

@@ -1738,7 +1738,7 @@ ttwu_do_activate(struct rq *rq, struct task_struct *p, int wake_flags,
#endif

ttwu_activate(rq, p, en_flags);
- ttwu_do_wakeup(rq, p, wake_flags, cookie);
+ ttwu_do_wakeup(rq, p, wake_flags, rf);
}

/*
@@ -1757,7 +1757,7 @@ static int ttwu_remote(struct task_struct *p, int wake_flags)
if (task_on_rq_queued(p)) {
/* check_preempt_curr() may use rq clock */
update_rq_clock(rq);
- ttwu_do_wakeup(rq, p, wake_flags, rf.cookie);
+ ttwu_do_wakeup(rq, p, wake_flags, &rf);
ret = 1;
}
__task_rq_unlock(rq, &rf);
@@ -1770,15 +1770,15 @@ void sched_ttwu_pending(void)
{
struct rq *rq = this_rq();
struct llist_node *llist = llist_del_all(&rq->wake_list);
- struct pin_cookie cookie;
struct task_struct *p;
unsigned long flags;
+ struct rq_flags rf;

if (!llist)
return;

raw_spin_lock_irqsave(&rq->lock, flags);
- cookie = lockdep_pin_lock(&rq->lock);
+ rq_pin_lock(rq, &rf);

while (llist) {
int wake_flags = 0;
@@ -1789,10 +1789,10 @@ void sched_ttwu_pending(void)
if (p->sched_remote_wakeup)
wake_flags = WF_MIGRATED;

- ttwu_do_activate(rq, p, wake_flags, cookie);
+ ttwu_do_activate(rq, p, wake_flags, &rf);
}

- lockdep_unpin_lock(&rq->lock, cookie);
+ rq_unpin_lock(rq, &rf);
raw_spin_unlock_irqrestore(&rq->lock, flags);
}

@@ -1881,7 +1881,7 @@ bool cpus_share_cache(int this_cpu, int that_cpu)
static void ttwu_queue(struct task_struct *p, int cpu, int wake_flags)
{
struct rq *rq = cpu_rq(cpu);
- struct pin_cookie cookie;
+ struct rq_flags rf;

#if defined(CONFIG_SMP)
if (sched_feat(TTWU_QUEUE) && !cpus_share_cache(smp_processor_id(), cpu)) {
@@ -1892,9 +1892,9 @@ static void ttwu_queue(struct task_struct *p, int cpu, int wake_flags)
#endif

raw_spin_lock(&rq->lock);
- cookie = lockdep_pin_lock(&rq->lock);
- ttwu_do_activate(rq, p, wake_flags, cookie);
- lockdep_unpin_lock(&rq->lock, cookie);
+ rq_pin_lock(rq, &rf);
+ ttwu_do_activate(rq, p, wake_flags, &rf);
+ rq_unpin_lock(rq, &rf);
raw_spin_unlock(&rq->lock);
}

@@ -2111,7 +2111,7 @@ out:
* ensure that this_rq() is locked, @p is bound to this_rq() and not
* the current task.
*/
-static void try_to_wake_up_local(struct task_struct *p, struct pin_cookie cookie)
+static void try_to_wake_up_local(struct task_struct *p, struct rq_flags *rf)
{
struct rq *rq = task_rq(p);

@@ -2128,11 +2128,11 @@ static void try_to_wake_up_local(struct task_struct *p, struct pin_cookie cookie
* disabled avoiding further scheduler activity on it and we've
* not yet picked a replacement task.
*/
- lockdep_unpin_lock(&rq->lock, cookie);
+ rq_unpin_lock(rq, rf);
raw_spin_unlock(&rq->lock);
raw_spin_lock(&p->pi_lock);
raw_spin_lock(&rq->lock);
- lockdep_repin_lock(&rq->lock, cookie);
+ rq_repin_lock(rq, rf);
}

if (!(p->state & TASK_NORMAL))
@@ -2143,7 +2143,7 @@ static void try_to_wake_up_local(struct task_struct *p, struct pin_cookie cookie
if (!task_on_rq_queued(p))
ttwu_activate(rq, p, ENQUEUE_WAKEUP);

- ttwu_do_wakeup(rq, p, 0, cookie);
+ ttwu_do_wakeup(rq, p, 0, rf);
ttwu_stat(p, smp_processor_id(), 0);
out:
raw_spin_unlock(&p->pi_lock);
@@ -2590,9 +2590,9 @@ void wake_up_new_task(struct task_struct *p)
* Nothing relies on rq->lock after this, so its fine to
* drop it.
*/
- lockdep_unpin_lock(&rq->lock, rf.cookie);
+ rq_unpin_lock(rq, &rf);
p->sched_class->task_woken(rq, p);
- lockdep_repin_lock(&rq->lock, rf.cookie);
+ rq_repin_lock(rq, &rf);
}
#endif
task_rq_unlock(rq, p, &rf);
@@ -2861,7 +2861,7 @@ asmlinkage __visible void schedule_tail(struct task_struct *prev)
*/
static __always_inline struct rq *
context_switch(struct rq *rq, struct task_struct *prev,
- struct task_struct *next, struct pin_cookie cookie)
+ struct task_struct *next, struct rq_flags *rf)
{
struct mm_struct *mm, *oldmm;

@@ -2893,7 +2893,7 @@ context_switch(struct rq *rq, struct task_struct *prev,
* of the scheduler it's an obvious special-case), so we
* do an early lockdep release here:
*/
- lockdep_unpin_lock(&rq->lock, cookie);
+ rq_unpin_lock(rq, rf);
spin_release(&rq->lock.dep_map, 1, _THIS_IP_);

/* Here we just switch the register state and the stack. */
@@ -3257,7 +3257,7 @@ static inline void schedule_debug(struct task_struct *prev)
* Pick up the highest-prio task:
*/
static inline struct task_struct *
-pick_next_task(struct rq *rq, struct task_struct *prev, struct pin_cookie cookie)
+pick_next_task(struct rq *rq, struct task_struct *prev, struct rq_flags *rf)
{
const struct sched_class *class = &fair_sched_class;
struct task_struct *p;
@@ -3268,20 +3268,20 @@ pick_next_task(struct rq *rq, struct task_struct *prev, struct pin_cookie cookie
*/
if (likely(prev->sched_class == class &&
rq->nr_running == rq->cfs.h_nr_running)) {
- p = fair_sched_class.pick_next_task(rq, prev, cookie);
+ p = fair_sched_class.pick_next_task(rq, prev, rf);
if (unlikely(p == RETRY_TASK))
goto again;

/* assumes fair_sched_class->next == idle_sched_class */
if (unlikely(!p))
- p = idle_sched_class.pick_next_task(rq, prev, cookie);
+ p = idle_sched_class.pick_next_task(rq, prev, rf);

return p;
}

again:
for_each_class(class) {
- p = class->pick_next_task(rq, prev, cookie);
+ p = class->pick_next_task(rq, prev, rf);
if (p) {
if (unlikely(p == RETRY_TASK))
goto again;
@@ -3335,7 +3335,7 @@ static void __sched notrace __schedule(bool preempt)
{
struct task_struct *prev, *next;
unsigned long *switch_count;
- struct pin_cookie cookie;
+ struct rq_flags rf;
struct rq *rq;
int cpu;

@@ -3358,7 +3358,7 @@ static void __sched notrace __schedule(bool preempt)
*/
smp_mb__before_spinlock();
raw_spin_lock(&rq->lock);
- cookie = lockdep_pin_lock(&rq->lock);
+ rq_pin_lock(rq, &rf);

rq->clock_skip_update <<= 1; /* promote REQ to ACT */

@@ -3380,7 +3380,7 @@ static void __sched notrace __schedule(bool preempt)

to_wakeup = wq_worker_sleeping(prev);
if (to_wakeup)
- try_to_wake_up_local(to_wakeup, cookie);
+ try_to_wake_up_local(to_wakeup, &rf);
}
}
switch_count = &prev->nvcsw;
@@ -3389,7 +3389,7 @@ static void __sched notrace __schedule(bool preempt)
if (task_on_rq_queued(prev))
update_rq_clock(rq);

- next = pick_next_task(rq, prev, cookie);
+ next = pick_next_task(rq, prev, &rf);
clear_tsk_need_resched(prev);
clear_preempt_need_resched();
rq->clock_skip_update = 0;
@@ -3400,9 +3400,9 @@ static void __sched notrace __schedule(bool preempt)
++*switch_count;

trace_sched_switch(preempt, prev, next);
- rq = context_switch(rq, prev, next, cookie); /* unlocks the rq */
+ rq = context_switch(rq, prev, next, &rf); /* unlocks the rq */
} else {
- lockdep_unpin_lock(&rq->lock, cookie);
+ rq_unpin_lock(rq, &rf);
raw_spin_unlock_irq(&rq->lock);
}

@@ -5521,7 +5521,7 @@ static void migrate_tasks(struct rq *dead_rq)
{
struct rq *rq = dead_rq;
struct task_struct *next, *stop = rq->stop;
- struct pin_cookie cookie;
+ struct rq_flags rf;
int dest_cpu;

/*
@@ -5553,8 +5553,8 @@ static void migrate_tasks(struct rq *dead_rq)
/*
* pick_next_task assumes pinned rq->lock.
*/
- cookie = lockdep_pin_lock(&rq->lock);
- next = pick_next_task(rq, &fake_task, cookie);
+ rq_pin_lock(rq, &rf);
+ next = pick_next_task(rq, &fake_task, &rf);
BUG_ON(!next);
next->sched_class->put_prev_task(rq, next);

@@ -5567,7 +5567,7 @@ static void migrate_tasks(struct rq *dead_rq)
* because !cpu_active at this point, which means load-balance
* will not interfere. Also, stop-machine.
*/
- lockdep_unpin_lock(&rq->lock, cookie);
+ rq_unpin_lock(rq, &rf);
raw_spin_unlock(&rq->lock);
raw_spin_lock(&next->pi_lock);
raw_spin_lock(&rq->lock);
diff --git a/kernel/sched/deadline.c b/kernel/sched/deadline.c
index 70ef2b1..491ff66 100644
--- a/kernel/sched/deadline.c
+++ b/kernel/sched/deadline.c
@@ -663,9 +663,9 @@ static enum hrtimer_restart dl_task_timer(struct hrtimer *timer)
* Nothing relies on rq->lock after this, so its safe to drop
* rq->lock.
*/
- lockdep_unpin_lock(&rq->lock, rf.cookie);
+ rq_unpin_lock(rq, &rf);
push_dl_task(rq);
- lockdep_repin_lock(&rq->lock, rf.cookie);
+ rq_repin_lock(rq, &rf);
}
#endif

@@ -1118,7 +1118,7 @@ static struct sched_dl_entity *pick_next_dl_entity(struct rq *rq,
}

struct task_struct *
-pick_next_task_dl(struct rq *rq, struct task_struct *prev, struct pin_cookie cookie)
+pick_next_task_dl(struct rq *rq, struct task_struct *prev, struct rq_flags *rf)
{
struct sched_dl_entity *dl_se;
struct task_struct *p;
@@ -1133,9 +1133,9 @@ pick_next_task_dl(struct rq *rq, struct task_struct *prev, struct pin_cookie coo
* disabled avoiding further scheduler activity on it and we're
* being very careful to re-start the picking loop.
*/
- lockdep_unpin_lock(&rq->lock, cookie);
+ rq_unpin_lock(rq, rf);
pull_dl_task(rq);
- lockdep_repin_lock(&rq->lock, cookie);
+ rq_repin_lock(rq, rf);
/*
* pull_dl_task() can drop (and re-acquire) rq->lock; this
* means a stop task can slip in, in which case we need to
diff --git a/kernel/sched/fair.c b/kernel/sched/fair.c
index 6559d19..4904412 100644
--- a/kernel/sched/fair.c
+++ b/kernel/sched/fair.c
@@ -6213,7 +6213,7 @@ preempt:
}

static struct task_struct *
-pick_next_task_fair(struct rq *rq, struct task_struct *prev, struct pin_cookie cookie)
+pick_next_task_fair(struct rq *rq, struct task_struct *prev, struct rq_flags *rf)
{
struct cfs_rq *cfs_rq = &rq->cfs;
struct sched_entity *se;
@@ -6326,9 +6326,9 @@ idle:
* further scheduler activity on it and we're being very careful to
* re-start the picking loop.
*/
- lockdep_unpin_lock(&rq->lock, cookie);
+ rq_unpin_lock(rq, rf);
new_tasks = idle_balance(rq);
- lockdep_repin_lock(&rq->lock, cookie);
+ rq_repin_lock(rq, rf);
/*
* Because idle_balance() releases (and re-acquires) rq->lock, it is
* possible for any higher priority task to appear. In that case we
diff --git a/kernel/sched/idle_task.c b/kernel/sched/idle_task.c
index 5405d3f..0c00172 100644
--- a/kernel/sched/idle_task.c
+++ b/kernel/sched/idle_task.c
@@ -24,7 +24,7 @@ static void check_preempt_curr_idle(struct rq *rq, struct task_struct *p, int fl
}

static struct task_struct *
-pick_next_task_idle(struct rq *rq, struct task_struct *prev, struct pin_cookie cookie)
+pick_next_task_idle(struct rq *rq, struct task_struct *prev, struct rq_flags *rf)
{
put_prev_task(rq, prev);
update_idle_core(rq);
diff --git a/kernel/sched/rt.c b/kernel/sched/rt.c
index 2516b8d..88254be 100644
--- a/kernel/sched/rt.c
+++ b/kernel/sched/rt.c
@@ -1523,7 +1523,7 @@ static struct task_struct *_pick_next_task_rt(struct rq *rq)
}

static struct task_struct *
-pick_next_task_rt(struct rq *rq, struct task_struct *prev, struct pin_cookie cookie)
+pick_next_task_rt(struct rq *rq, struct task_struct *prev, struct rq_flags *rf)
{
struct task_struct *p;
struct rt_rq *rt_rq = &rq->rt;
@@ -1535,9 +1535,9 @@ pick_next_task_rt(struct rq *rq, struct task_struct *prev, struct pin_cookie coo
* disabled avoiding further scheduler activity on it and we're
* being very careful to re-start the picking loop.
*/
- lockdep_unpin_lock(&rq->lock, cookie);
+ rq_unpin_lock(rq, rf);
pull_rt_task(rq);
- lockdep_repin_lock(&rq->lock, cookie);
+ rq_repin_lock(rq, rf);
/*
* pull_rt_task() can drop (and re-acquire) rq->lock; this
* means a dl or stop task can slip in, in which case we need
diff --git a/kernel/sched/sched.h b/kernel/sched/sched.h
index 7b34c78..98e7eee 100644
--- a/kernel/sched/sched.h
+++ b/kernel/sched/sched.h
@@ -792,6 +792,26 @@ static inline void rq_clock_skip_update(struct rq *rq, bool skip)
rq->clock_skip_update &= ~RQCF_REQ_SKIP;
}

+struct rq_flags {
+ unsigned long flags;
+ struct pin_cookie cookie;
+};
+
+static inline void rq_pin_lock(struct rq *rq, struct rq_flags *rf)
+{
+ rf->cookie = lockdep_pin_lock(&rq->lock);
+}
+
+static inline void rq_unpin_lock(struct rq *rq, struct rq_flags *rf)
+{
+ lockdep_unpin_lock(&rq->lock, rf->cookie);
+}
+
+static inline void rq_repin_lock(struct rq *rq, struct rq_flags *rf)
+{
+ lockdep_repin_lock(&rq->lock, rf->cookie);
+}
+
#ifdef CONFIG_NUMA
enum numa_topology_type {
NUMA_DIRECT,
@@ -1245,7 +1265,7 @@ struct sched_class {
*/
struct task_struct * (*pick_next_task) (struct rq *rq,
struct task_struct *prev,
- struct pin_cookie cookie);
+ struct rq_flags *rf);
void (*put_prev_task) (struct rq *rq, struct task_struct *p);

#ifdef CONFIG_SMP
@@ -1501,11 +1521,6 @@ static inline void sched_rt_avg_update(struct rq *rq, u64 rt_delta) { }
static inline void sched_avg_update(struct rq *rq) { }
#endif

-struct rq_flags {
- unsigned long flags;
- struct pin_cookie cookie;
-};
-
struct rq *__task_rq_lock(struct task_struct *p, struct rq_flags *rf)
__acquires(rq->lock);
struct rq *task_rq_lock(struct task_struct *p, struct rq_flags *rf)
@@ -1515,7 +1530,7 @@ struct rq *task_rq_lock(struct task_struct *p, struct rq_flags *rf)
static inline void __task_rq_unlock(struct rq *rq, struct rq_flags *rf)
__releases(rq->lock)
{
- lockdep_unpin_lock(&rq->lock, rf->cookie);
+ rq_unpin_lock(rq, rf);
raw_spin_unlock(&rq->lock);
}

@@ -1524,7 +1539,7 @@ task_rq_unlock(struct rq *rq, struct task_struct *p, struct rq_flags *rf)
__releases(rq->lock)
__releases(p->pi_lock)
{
- lockdep_unpin_lock(&rq->lock, rf->cookie);
+ rq_unpin_lock(rq, rf);
raw_spin_unlock(&rq->lock);
raw_spin_unlock_irqrestore(&p->pi_lock, rf->flags);
}
diff --git a/kernel/sched/stop_task.c b/kernel/sched/stop_task.c
index 604297a..9f69fb6 100644
--- a/kernel/sched/stop_task.c
+++ b/kernel/sched/stop_task.c
@@ -24,7 +24,7 @@ check_preempt_curr_stop(struct rq *rq, struct task_struct *p, int flags)
}

static struct task_struct *
-pick_next_task_stop(struct rq *rq, struct task_struct *prev, struct pin_cookie cookie)
+pick_next_task_stop(struct rq *rq, struct task_struct *prev, struct rq_flags *rf)
{
struct task_struct *stop = rq->stop;