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authorThomas Gleixner <tglx@linutronix.de>2009-11-17 20:02:06 +0300
committerThomas Gleixner <tglx@linutronix.de>2009-12-15 01:55:34 +0300
commite625cce1b73fb38b74e5387226534f7bcbfc36fe (patch)
treecfdecc4326845d0601d1447aad334e78d92d3316
parentecb49d1a639acbacfc3771cae5ec07bed5df3847 (diff)
downloadlinux-e625cce1b73fb38b74e5387226534f7bcbfc36fe.tar.xz
perf_event: Convert to raw_spinlock
Convert locks which cannot be sleeping locks in preempt-rt to raw_spinlocks. Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Acked-by: Peter Zijlstra <peterz@infradead.org> Acked-by: Ingo Molnar <mingo@elte.hu>
-rw-r--r--include/linux/perf_event.h2
-rw-r--r--kernel/hw_breakpoint.c4
-rw-r--r--kernel/perf_event.c106
3 files changed, 56 insertions, 56 deletions
diff --git a/include/linux/perf_event.h b/include/linux/perf_event.h
index 64a53f74c9a9..da7bdc23f279 100644
--- a/include/linux/perf_event.h
+++ b/include/linux/perf_event.h
@@ -681,7 +681,7 @@ struct perf_event_context {
* Protect the states of the events in the list,
* nr_active, and the list:
*/
- spinlock_t lock;
+ raw_spinlock_t lock;
/*
* Protect the list of events. Locking either mutex or lock
* is sufficient to ensure the list doesn't change; to change
diff --git a/kernel/hw_breakpoint.c b/kernel/hw_breakpoint.c
index 366eedf949c0..dbcbf6a33a08 100644
--- a/kernel/hw_breakpoint.c
+++ b/kernel/hw_breakpoint.c
@@ -96,7 +96,7 @@ static int task_bp_pinned(struct task_struct *tsk)
list = &ctx->event_list;
- spin_lock_irqsave(&ctx->lock, flags);
+ raw_spin_lock_irqsave(&ctx->lock, flags);
/*
* The current breakpoint counter is not included in the list
@@ -107,7 +107,7 @@ static int task_bp_pinned(struct task_struct *tsk)
count++;
}
- spin_unlock_irqrestore(&ctx->lock, flags);
+ raw_spin_unlock_irqrestore(&ctx->lock, flags);
return count;
}
diff --git a/kernel/perf_event.c b/kernel/perf_event.c
index e73e53c7582f..9052d6c8c9fd 100644
--- a/kernel/perf_event.c
+++ b/kernel/perf_event.c
@@ -203,14 +203,14 @@ perf_lock_task_context(struct task_struct *task, unsigned long *flags)
* if so. If we locked the right context, then it
* can't get swapped on us any more.
*/
- spin_lock_irqsave(&ctx->lock, *flags);
+ raw_spin_lock_irqsave(&ctx->lock, *flags);
if (ctx != rcu_dereference(task->perf_event_ctxp)) {
- spin_unlock_irqrestore(&ctx->lock, *flags);
+ raw_spin_unlock_irqrestore(&ctx->lock, *flags);
goto retry;
}
if (!atomic_inc_not_zero(&ctx->refcount)) {
- spin_unlock_irqrestore(&ctx->lock, *flags);
+ raw_spin_unlock_irqrestore(&ctx->lock, *flags);
ctx = NULL;
}
}
@@ -231,7 +231,7 @@ static struct perf_event_context *perf_pin_task_context(struct task_struct *task
ctx = perf_lock_task_context(task, &flags);
if (ctx) {
++ctx->pin_count;
- spin_unlock_irqrestore(&ctx->lock, flags);
+ raw_spin_unlock_irqrestore(&ctx->lock, flags);
}
return ctx;
}
@@ -240,9 +240,9 @@ static void perf_unpin_context(struct perf_event_context *ctx)
{
unsigned long flags;
- spin_lock_irqsave(&ctx->lock, flags);
+ raw_spin_lock_irqsave(&ctx->lock, flags);
--ctx->pin_count;
- spin_unlock_irqrestore(&ctx->lock, flags);
+ raw_spin_unlock_irqrestore(&ctx->lock, flags);
put_ctx(ctx);
}
@@ -427,7 +427,7 @@ static void __perf_event_remove_from_context(void *info)
if (ctx->task && cpuctx->task_ctx != ctx)
return;
- spin_lock(&ctx->lock);
+ raw_spin_lock(&ctx->lock);
/*
* Protect the list operation against NMI by disabling the
* events on a global level.
@@ -449,7 +449,7 @@ static void __perf_event_remove_from_context(void *info)
}
perf_enable();
- spin_unlock(&ctx->lock);
+ raw_spin_unlock(&ctx->lock);
}
@@ -488,12 +488,12 @@ retry:
task_oncpu_function_call(task, __perf_event_remove_from_context,
event);
- spin_lock_irq(&ctx->lock);
+ raw_spin_lock_irq(&ctx->lock);
/*
* If the context is active we need to retry the smp call.
*/
if (ctx->nr_active && !list_empty(&event->group_entry)) {
- spin_unlock_irq(&ctx->lock);
+ raw_spin_unlock_irq(&ctx->lock);
goto retry;
}
@@ -504,7 +504,7 @@ retry:
*/
if (!list_empty(&event->group_entry))
list_del_event(event, ctx);
- spin_unlock_irq(&ctx->lock);
+ raw_spin_unlock_irq(&ctx->lock);
}
/*
@@ -535,7 +535,7 @@ static void __perf_event_disable(void *info)
if (ctx->task && cpuctx->task_ctx != ctx)
return;
- spin_lock(&ctx->lock);
+ raw_spin_lock(&ctx->lock);
/*
* If the event is on, turn it off.
@@ -551,7 +551,7 @@ static void __perf_event_disable(void *info)
event->state = PERF_EVENT_STATE_OFF;
}
- spin_unlock(&ctx->lock);
+ raw_spin_unlock(&ctx->lock);
}
/*
@@ -584,12 +584,12 @@ void perf_event_disable(struct perf_event *event)
retry:
task_oncpu_function_call(task, __perf_event_disable, event);
- spin_lock_irq(&ctx->lock);
+ raw_spin_lock_irq(&ctx->lock);
/*
* If the event is still active, we need to retry the cross-call.
*/
if (event->state == PERF_EVENT_STATE_ACTIVE) {
- spin_unlock_irq(&ctx->lock);
+ raw_spin_unlock_irq(&ctx->lock);
goto retry;
}
@@ -602,7 +602,7 @@ void perf_event_disable(struct perf_event *event)
event->state = PERF_EVENT_STATE_OFF;
}
- spin_unlock_irq(&ctx->lock);
+ raw_spin_unlock_irq(&ctx->lock);
}
static int
@@ -770,7 +770,7 @@ static void __perf_install_in_context(void *info)
cpuctx->task_ctx = ctx;
}
- spin_lock(&ctx->lock);
+ raw_spin_lock(&ctx->lock);
ctx->is_active = 1;
update_context_time(ctx);
@@ -820,7 +820,7 @@ static void __perf_install_in_context(void *info)
unlock:
perf_enable();
- spin_unlock(&ctx->lock);
+ raw_spin_unlock(&ctx->lock);
}
/*
@@ -856,12 +856,12 @@ retry:
task_oncpu_function_call(task, __perf_install_in_context,
event);
- spin_lock_irq(&ctx->lock);
+ raw_spin_lock_irq(&ctx->lock);
/*
* we need to retry the smp call.
*/
if (ctx->is_active && list_empty(&event->group_entry)) {
- spin_unlock_irq(&ctx->lock);
+ raw_spin_unlock_irq(&ctx->lock);
goto retry;
}
@@ -872,7 +872,7 @@ retry:
*/
if (list_empty(&event->group_entry))
add_event_to_ctx(event, ctx);
- spin_unlock_irq(&ctx->lock);
+ raw_spin_unlock_irq(&ctx->lock);
}
/*
@@ -917,7 +917,7 @@ static void __perf_event_enable(void *info)
cpuctx->task_ctx = ctx;
}
- spin_lock(&ctx->lock);
+ raw_spin_lock(&ctx->lock);
ctx->is_active = 1;
update_context_time(ctx);
@@ -959,7 +959,7 @@ static void __perf_event_enable(void *info)
}
unlock:
- spin_unlock(&ctx->lock);
+ raw_spin_unlock(&ctx->lock);
}
/*
@@ -985,7 +985,7 @@ void perf_event_enable(struct perf_event *event)
return;
}
- spin_lock_irq(&ctx->lock);
+ raw_spin_lock_irq(&ctx->lock);
if (event->state >= PERF_EVENT_STATE_INACTIVE)
goto out;
@@ -1000,10 +1000,10 @@ void perf_event_enable(struct perf_event *event)
event->state = PERF_EVENT_STATE_OFF;
retry:
- spin_unlock_irq(&ctx->lock);
+ raw_spin_unlock_irq(&ctx->lock);
task_oncpu_function_call(task, __perf_event_enable, event);
- spin_lock_irq(&ctx->lock);
+ raw_spin_lock_irq(&ctx->lock);
/*
* If the context is active and the event is still off,
@@ -1020,7 +1020,7 @@ void perf_event_enable(struct perf_event *event)
__perf_event_mark_enabled(event, ctx);
out:
- spin_unlock_irq(&ctx->lock);
+ raw_spin_unlock_irq(&ctx->lock);
}
static int perf_event_refresh(struct perf_event *event, int refresh)
@@ -1042,7 +1042,7 @@ void __perf_event_sched_out(struct perf_event_context *ctx,
{
struct perf_event *event;
- spin_lock(&ctx->lock);
+ raw_spin_lock(&ctx->lock);
ctx->is_active = 0;
if (likely(!ctx->nr_events))
goto out;
@@ -1055,7 +1055,7 @@ void __perf_event_sched_out(struct perf_event_context *ctx,
}
perf_enable();
out:
- spin_unlock(&ctx->lock);
+ raw_spin_unlock(&ctx->lock);
}
/*
@@ -1193,8 +1193,8 @@ void perf_event_task_sched_out(struct task_struct *task,
* order we take the locks because no other cpu could
* be trying to lock both of these tasks.
*/
- spin_lock(&ctx->lock);
- spin_lock_nested(&next_ctx->lock, SINGLE_DEPTH_NESTING);
+ raw_spin_lock(&ctx->lock);
+ raw_spin_lock_nested(&next_ctx->lock, SINGLE_DEPTH_NESTING);
if (context_equiv(ctx, next_ctx)) {
/*
* XXX do we need a memory barrier of sorts
@@ -1208,8 +1208,8 @@ void perf_event_task_sched_out(struct task_struct *task,
perf_event_sync_stat(ctx, next_ctx);
}
- spin_unlock(&next_ctx->lock);
- spin_unlock(&ctx->lock);
+ raw_spin_unlock(&next_ctx->lock);
+ raw_spin_unlock(&ctx->lock);
}
rcu_read_unlock();
@@ -1251,7 +1251,7 @@ __perf_event_sched_in(struct perf_event_context *ctx,
struct perf_event *event;
int can_add_hw = 1;
- spin_lock(&ctx->lock);
+ raw_spin_lock(&ctx->lock);
ctx->is_active = 1;
if (likely(!ctx->nr_events))
goto out;
@@ -1306,7 +1306,7 @@ __perf_event_sched_in(struct perf_event_context *ctx,
}
perf_enable();
out:
- spin_unlock(&ctx->lock);
+ raw_spin_unlock(&ctx->lock);
}
/*
@@ -1370,7 +1370,7 @@ static void perf_ctx_adjust_freq(struct perf_event_context *ctx)
struct hw_perf_event *hwc;
u64 interrupts, freq;
- spin_lock(&ctx->lock);
+ raw_spin_lock(&ctx->lock);
list_for_each_entry_rcu(event, &ctx->event_list, event_entry) {
if (event->state != PERF_EVENT_STATE_ACTIVE)
continue;
@@ -1425,7 +1425,7 @@ static void perf_ctx_adjust_freq(struct perf_event_context *ctx)
perf_enable();
}
}
- spin_unlock(&ctx->lock);
+ raw_spin_unlock(&ctx->lock);
}
/*
@@ -1438,7 +1438,7 @@ static void rotate_ctx(struct perf_event_context *ctx)
if (!ctx->nr_events)
return;
- spin_lock(&ctx->lock);
+ raw_spin_lock(&ctx->lock);
/*
* Rotate the first entry last (works just fine for group events too):
*/
@@ -1449,7 +1449,7 @@ static void rotate_ctx(struct perf_event_context *ctx)
}
perf_enable();
- spin_unlock(&ctx->lock);
+ raw_spin_unlock(&ctx->lock);
}
void perf_event_task_tick(struct task_struct *curr, int cpu)
@@ -1498,7 +1498,7 @@ static void perf_event_enable_on_exec(struct task_struct *task)
__perf_event_task_sched_out(ctx);
- spin_lock(&ctx->lock);
+ raw_spin_lock(&ctx->lock);
list_for_each_entry(event, &ctx->group_list, group_entry) {
if (!event->attr.enable_on_exec)
@@ -1516,7 +1516,7 @@ static void perf_event_enable_on_exec(struct task_struct *task)
if (enabled)
unclone_ctx(ctx);
- spin_unlock(&ctx->lock);
+ raw_spin_unlock(&ctx->lock);
perf_event_task_sched_in(task, smp_processor_id());
out:
@@ -1542,10 +1542,10 @@ static void __perf_event_read(void *info)
if (ctx->task && cpuctx->task_ctx != ctx)
return;
- spin_lock(&ctx->lock);
+ raw_spin_lock(&ctx->lock);
update_context_time(ctx);
update_event_times(event);
- spin_unlock(&ctx->lock);
+ raw_spin_unlock(&ctx->lock);
event->pmu->read(event);
}
@@ -1563,10 +1563,10 @@ static u64 perf_event_read(struct perf_event *event)
struct perf_event_context *ctx = event->ctx;
unsigned long flags;
- spin_lock_irqsave(&ctx->lock, flags);
+ raw_spin_lock_irqsave(&ctx->lock, flags);
update_context_time(ctx);
update_event_times(event);
- spin_unlock_irqrestore(&ctx->lock, flags);
+ raw_spin_unlock_irqrestore(&ctx->lock, flags);
}
return atomic64_read(&event->count);
@@ -1579,7 +1579,7 @@ static void
__perf_event_init_context(struct perf_event_context *ctx,
struct task_struct *task)
{
- spin_lock_init(&ctx->lock);
+ raw_spin_lock_init(&ctx->lock);
mutex_init(&ctx->mutex);
INIT_LIST_HEAD(&ctx->group_list);
INIT_LIST_HEAD(&ctx->event_list);
@@ -1649,7 +1649,7 @@ static struct perf_event_context *find_get_context(pid_t pid, int cpu)
ctx = perf_lock_task_context(task, &flags);
if (ctx) {
unclone_ctx(ctx);
- spin_unlock_irqrestore(&ctx->lock, flags);
+ raw_spin_unlock_irqrestore(&ctx->lock, flags);
}
if (!ctx) {
@@ -1987,7 +1987,7 @@ static int perf_event_period(struct perf_event *event, u64 __user *arg)
if (!value)
return -EINVAL;
- spin_lock_irq(&ctx->lock);
+ raw_spin_lock_irq(&ctx->lock);
if (event->attr.freq) {
if (value > sysctl_perf_event_sample_rate) {
ret = -EINVAL;
@@ -2000,7 +2000,7 @@ static int perf_event_period(struct perf_event *event, u64 __user *arg)
event->hw.sample_period = value;
}
unlock:
- spin_unlock_irq(&ctx->lock);
+ raw_spin_unlock_irq(&ctx->lock);
return ret;
}
@@ -4992,7 +4992,7 @@ void perf_event_exit_task(struct task_struct *child)
* reading child->perf_event_ctxp, we wait until it has
* incremented the context's refcount before we do put_ctx below.
*/
- spin_lock(&child_ctx->lock);
+ raw_spin_lock(&child_ctx->lock);
child->perf_event_ctxp = NULL;
/*
* If this context is a clone; unclone it so it can't get
@@ -5001,7 +5001,7 @@ void perf_event_exit_task(struct task_struct *child)
*/
unclone_ctx(child_ctx);
update_context_time(child_ctx);
- spin_unlock_irqrestore(&child_ctx->lock, flags);
+ raw_spin_unlock_irqrestore(&child_ctx->lock, flags);
/*
* Report the task dead after unscheduling the events so that we
@@ -5292,11 +5292,11 @@ perf_set_reserve_percpu(struct sysdev_class *class,
perf_reserved_percpu = val;
for_each_online_cpu(cpu) {
cpuctx = &per_cpu(perf_cpu_context, cpu);
- spin_lock_irq(&cpuctx->ctx.lock);
+ raw_spin_lock_irq(&cpuctx->ctx.lock);
mpt = min(perf_max_events - cpuctx->ctx.nr_events,
perf_max_events - perf_reserved_percpu);
cpuctx->max_pertask = mpt;
- spin_unlock_irq(&cpuctx->ctx.lock);
+ raw_spin_unlock_irq(&cpuctx->ctx.lock);
}
spin_unlock(&perf_resource_lock);