#include <linux/hardirq.h>
#include <linux/export.h>
-DEFINE_PER_CPU(struct context_tracking, context_tracking) = {
-#ifdef CONFIG_CONTEXT_TRACKING_FORCE
- .active = true,
-#endif
-};
+#define CREATE_TRACE_POINTS
+#include <trace/events/context_tracking.h>
+
+struct static_key context_tracking_enabled = STATIC_KEY_INIT_FALSE;
+EXPORT_SYMBOL_GPL(context_tracking_enabled);
+
+DEFINE_PER_CPU(struct context_tracking, context_tracking);
+EXPORT_SYMBOL_GPL(context_tracking);
+
+void context_tracking_cpu_set(int cpu)
+{
+ if (!per_cpu(context_tracking.active, cpu)) {
+ per_cpu(context_tracking.active, cpu) = true;
+ static_key_slow_inc(&context_tracking_enabled);
+ }
+}
/**
- * user_enter - Inform the context tracking that the CPU is going to
- * enter userspace mode.
+ * context_tracking_user_enter - Inform the context tracking that the CPU is going to
+ * enter userspace mode.
*
* This function must be called right before we switch from the kernel
* to userspace, when it's guaranteed the remaining kernel instructions
* to execute won't use any RCU read side critical section because this
* function sets RCU in extended quiescent state.
*/
-void user_enter(void)
+void context_tracking_user_enter(void)
{
unsigned long flags;
WARN_ON_ONCE(!current->mm);
local_irq_save(flags);
- if (__this_cpu_read(context_tracking.active) &&
- __this_cpu_read(context_tracking.state) != IN_USER) {
+ if ( __this_cpu_read(context_tracking.state) != IN_USER) {
+ if (__this_cpu_read(context_tracking.active)) {
+ trace_user_enter(0);
+ /*
+ * At this stage, only low level arch entry code remains and
+ * then we'll run in userspace. We can assume there won't be
+ * any RCU read-side critical section until the next call to
+ * user_exit() or rcu_irq_enter(). Let's remove RCU's dependency
+ * on the tick.
+ */
+ vtime_user_enter(current);
+ rcu_user_enter();
+ }
/*
- * At this stage, only low level arch entry code remains and
- * then we'll run in userspace. We can assume there won't be
- * any RCU read-side critical section until the next call to
- * user_exit() or rcu_irq_enter(). Let's remove RCU's dependency
- * on the tick.
+ * Even if context tracking is disabled on this CPU, because it's outside
+ * the full dynticks mask for example, we still have to keep track of the
+ * context transitions and states to prevent inconsistency on those of
+ * other CPUs.
+ * If a task triggers an exception in userspace, sleep on the exception
+ * handler and then migrate to another CPU, that new CPU must know where
+ * the exception returns by the time we call exception_exit().
+ * This information can only be provided by the previous CPU when it called
+ * exception_enter().
+ * OTOH we can spare the calls to vtime and RCU when context_tracking.active
+ * is false because we know that CPU is not tickless.
*/
- vtime_user_enter(current);
- rcu_user_enter();
__this_cpu_write(context_tracking.state, IN_USER);
}
local_irq_restore(flags);
*/
void __sched notrace preempt_schedule_context(void)
{
- struct thread_info *ti = current_thread_info();
enum ctx_state prev_ctx;
- if (likely(ti->preempt_count || irqs_disabled()))
+ if (likely(!preemptible()))
return;
/*
#endif /* CONFIG_PREEMPT */
/**
- * user_exit - Inform the context tracking that the CPU is
- * exiting userspace mode and entering the kernel.
+ * context_tracking_user_exit - Inform the context tracking that the CPU is
+ * exiting userspace mode and entering the kernel.
*
* This function must be called after we entered the kernel from userspace
* before any use of RCU read side critical section. This potentially include
* This call supports re-entrancy. This way it can be called from any exception
* handler without needing to know if we came from userspace or not.
*/
-void user_exit(void)
+void context_tracking_user_exit(void)
{
unsigned long flags;
local_irq_save(flags);
if (__this_cpu_read(context_tracking.state) == IN_USER) {
- /*
- * We are going to run code that may use RCU. Inform
- * RCU core about that (ie: we may need the tick again).
- */
- rcu_user_exit();
- vtime_user_exit(current);
+ if (__this_cpu_read(context_tracking.active)) {
+ /*
+ * We are going to run code that may use RCU. Inform
+ * RCU core about that (ie: we may need the tick again).
+ */
+ rcu_user_exit();
+ vtime_user_exit(current);
+ trace_user_exit(0);
+ }
__this_cpu_write(context_tracking.state, IN_KERNEL);
}
local_irq_restore(flags);
}
-void guest_enter(void)
-{
- if (vtime_accounting_enabled())
- vtime_guest_enter(current);
- else
- __guest_enter();
-}
-EXPORT_SYMBOL_GPL(guest_enter);
-
-void guest_exit(void)
-{
- if (vtime_accounting_enabled())
- vtime_guest_exit(current);
- else
- __guest_exit();
-}
-EXPORT_SYMBOL_GPL(guest_exit);
-
-
/**
- * context_tracking_task_switch - context switch the syscall callbacks
+ * __context_tracking_task_switch - context switch the syscall callbacks
* @prev: the task that is being switched out
* @next: the task that is being switched in
*
* migrate to some CPU that doesn't do the context tracking. As such the TIF
* flag may not be desired there.
*/
-void context_tracking_task_switch(struct task_struct *prev,
- struct task_struct *next)
+void __context_tracking_task_switch(struct task_struct *prev,
+ struct task_struct *next)
{
- if (__this_cpu_read(context_tracking.active)) {
- clear_tsk_thread_flag(prev, TIF_NOHZ);
- set_tsk_thread_flag(next, TIF_NOHZ);
- }
+ clear_tsk_thread_flag(prev, TIF_NOHZ);
+ set_tsk_thread_flag(next, TIF_NOHZ);
}
+
+#ifdef CONFIG_CONTEXT_TRACKING_FORCE
+void __init context_tracking_init(void)
+{
+ int cpu;
+
+ for_each_possible_cpu(cpu)
+ context_tracking_cpu_set(cpu);
+}
+#endif
projects / ~andy / linux / blobdiff