训练&测试过程全记录
1、训练过程
2018-10-13 18:47:32.811423:
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训练的数据集展示
1、数据集展示
/**
* context_tracking_enter - Inform the context tracking that the CPU is going
* enter user or guest space mode.
*
* This function must be called right before we switch from the kernel
* to user or guest space, 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 context_tracking_enter(enum ctx_state state)
{
unsigned long flags;
/*
* Repeat the user_enter() check here because some archs may be calling
* this from asm and if no CPU needs context tracking, they shouldn't
* go further. Repeat the check here until they support the inline static
* key check.
*/
if (!context_tracking_is_enabled())
return;
/*
* Some contexts may involve an exception occuring in an irq,
* leading to that nesting:
* rcu_irq_enter() rcu_user_exit() rcu_user_exit() rcu_irq_exit()
* This would mess up the dyntick_nesting count though. And rcu_irq_*()
* helpers are enough to protect RCU uses inside the exception. So
* just return immediately if we detect we are in an IRQ.
*/
if (in_interrupt())
return;
/* Kernel threads aren't supposed to go to userspace */
WARN_ON_ONCE(!current->mm);
local_irq_save(flags);
if ( __this_cpu_read(context_tracking.state) != state) {
if (__this_cpu_read(context_tracking.active)) {
/*
* 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.
*/
if (state == CONTEXT_USER) {
trace_user_enter(0);
vtime_user_enter(current);
}
rcu_user_enter();
}
/*
* 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.
*/
__this_cpu_write(context_tracking.state, state);
}
local_irq_restore(flags);
}
NOKPROBE_SYMBOL(context_tracking_enter);
EXPORT_SYMBOL_GPL(context_tracking_enter);
void context_tracking_user_enter(void)
{
context_tracking_enter(CONTEXT_USER);
}
NOKPROBE_SYMBOL(context_tracking_user_enter);
/**
* context_tracking_exit - Inform the context tracking that the CPU is
* exiting user or guest mode and entering the kernel.
*
* This function must be called after we entered the kernel from user or
* guest space before any use of RCU read side critical section. This
* potentially include any high level kernel code like syscalls, exceptions,
* signal handling, etc...
*
* 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 context_tracking_exit(enum ctx_state state)
{
unsigned long flags;
if (!context_tracking_is_enabled())
return;
if (in_interrupt())
return;
local_irq_save(flags);
if (__this_cpu_read(context_tracking.state) == state) {
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();
if (state == CONTEXT_USER) {
vtime_user_exit(current);
trace_user_exit(0);
}
}
__this_cpu_write(context_tracking.state, CONTEXT_KERNEL);
}
local_irq_restore(flags);
}
NOKPROBE_SYMBOL(context_tracking_exit);
EXPORT_SYMBOL_GPL(context_tracking_exit);
void context_tracking_user_exit(void)
{
context_tracking_exit(CONTEXT_USER);
}
NOKPROBE_SYMBOL(context_tracking_user_exit);
