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Merge branch 'perf/urgent' into perf/core, to avoid conflicts

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Signed-off-by: Ingo Molnar <mingo@kernel.org>
This commit is contained in:
Ingo Molnar
2014-05-07 13:39:22 +02:00
parent 3e46d21285 a4b4f11b27
commit 37b16beaa9
588 changed files with 6142 additions and 3533 deletions
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49
kernel/events/core.c
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@@ -1444,6 +1444,11 @@ group_sched_out(struct perf_event *group_event,
cpuctx->exclusive = 0;
}
struct remove_event {
struct perf_event *event;
bool detach_group;
};
/*
* Cross CPU call to remove a performance event
*
@@ -1452,12 +1457,15 @@ group_sched_out(struct perf_event *group_event,
*/
static int __perf_remove_from_context(void *info)
{
struct perf_event *event = info;
struct remove_event *re = info;
struct perf_event *event = re->event;
struct perf_event_context *ctx = event->ctx;
struct perf_cpu_context *cpuctx = __get_cpu_context(ctx);
raw_spin_lock(&ctx->lock);
event_sched_out(event, cpuctx, ctx);
if (re->detach_group)
perf_group_detach(event);
list_del_event(event, ctx);
if (!ctx->nr_events && cpuctx->task_ctx == ctx) {
ctx->is_active = 0;
@@ -1482,10 +1490,14 @@ static int __perf_remove_from_context(void *info)
* When called from perf_event_exit_task, it's OK because the
* context has been detached from its task.
*/
static void perf_remove_from_context(struct perf_event *event)
static void perf_remove_from_context(struct perf_event *event, bool detach_group)
{
struct perf_event_context *ctx = event->ctx;
struct task_struct *task = ctx->task;
struct remove_event re = {
.event = event,
.detach_group = detach_group,
};
lockdep_assert_held(&ctx->mutex);
@@ -1494,12 +1506,12 @@ static void perf_remove_from_context(struct perf_event *event)
* Per cpu events are removed via an smp call and
* the removal is always successful.
*/
cpu_function_call(event->cpu, __perf_remove_from_context, event);
cpu_function_call(event->cpu, __perf_remove_from_context, &re);
return;
}
retry:
if (!task_function_call(task, __perf_remove_from_context, event))
if (!task_function_call(task, __perf_remove_from_context, &re))
return;
raw_spin_lock_irq(&ctx->lock);
@@ -1516,6 +1528,8 @@ retry:
* Since the task isn't running, its safe to remove the event, us
* holding the ctx->lock ensures the task won't get scheduled in.
*/
if (detach_group)
perf_group_detach(event);
list_del_event(event, ctx);
raw_spin_unlock_irq(&ctx->lock);
}
@@ -3285,10 +3299,7 @@ int perf_event_release_kernel(struct perf_event *event)
* to trigger the AB-BA case.
*/
mutex_lock_nested(&ctx->mutex, SINGLE_DEPTH_NESTING);
raw_spin_lock_irq(&ctx->lock);
perf_group_detach(event);
raw_spin_unlock_irq(&ctx->lock);
perf_remove_from_context(event);
perf_remove_from_context(event, true);
mutex_unlock(&ctx->mutex);
free_event(event);
@@ -7180,7 +7191,7 @@ SYSCALL_DEFINE5(perf_event_open,
struct perf_event_context *gctx = group_leader->ctx;
mutex_lock(&gctx->mutex);
perf_remove_from_context(group_leader);
perf_remove_from_context(group_leader, false);
/*
* Removing from the context ends up with disabled
@@ -7190,7 +7201,7 @@ SYSCALL_DEFINE5(perf_event_open,
perf_event__state_init(group_leader);
list_for_each_entry(sibling, &group_leader->sibling_list,
group_entry) {
perf_remove_from_context(sibling);
perf_remove_from_context(sibling, false);
perf_event__state_init(sibling);
put_ctx(gctx);
}
@@ -7320,7 +7331,7 @@ void perf_pmu_migrate_context(struct pmu *pmu, int src_cpu, int dst_cpu)
mutex_lock(&src_ctx->mutex);
list_for_each_entry_safe(event, tmp, &src_ctx->event_list,
event_entry) {
perf_remove_from_context(event);
perf_remove_from_context(event, false);
unaccount_event_cpu(event, src_cpu);
put_ctx(src_ctx);
list_add(&event->migrate_entry, &events);
@@ -7382,13 +7393,7 @@ __perf_event_exit_task(struct perf_event *child_event,
struct perf_event_context *child_ctx,
struct task_struct *child)
{
if (child_event->parent) {
raw_spin_lock_irq(&child_ctx->lock);
perf_group_detach(child_event);
raw_spin_unlock_irq(&child_ctx->lock);
}
perf_remove_from_context(child_event);
perf_remove_from_context(child_event, !!child_event->parent);
/*
* It can happen that the parent exits first, and has events
@@ -7739,6 +7744,8 @@ int perf_event_init_context(struct task_struct *child, int ctxn)
* swapped under us.
*/
parent_ctx = perf_pin_task_context(parent, ctxn);
if (!parent_ctx)
return 0;
/*
* No need to check if parent_ctx != NULL here; since we saw
@@ -7872,14 +7879,14 @@ static void perf_pmu_rotate_stop(struct pmu *pmu)
static void __perf_event_exit_context(void *__info)
{
struct remove_event re = { .detach_group = false };
struct perf_event_context *ctx = __info;
struct perf_event *event;
perf_pmu_rotate_stop(ctx->pmu);
rcu_read_lock();
list_for_each_entry_rcu(event, &ctx->event_list, event_entry)
__perf_remove_from_context(event);
list_for_each_entry_rcu(re.event, &ctx->event_list, event_entry)
__perf_remove_from_context(&re);
rcu_read_unlock();
}