Release 4.12 include/linux/context_tracking.h

Directory: include/linux
#ifndef _LINUX_CONTEXT_TRACKING_H

#define _LINUX_CONTEXT_TRACKING_H

#include <linux/sched.h>
#include <linux/vtime.h>
#include <linux/context_tracking_state.h>
#include <asm/ptrace.h>


#ifdef CONFIG_CONTEXT_TRACKING
extern void context_tracking_cpu_set(int cpu);

/* Called with interrupts disabled.  */
extern void __context_tracking_enter(enum ctx_state state);
extern void __context_tracking_exit(enum ctx_state state);

extern void context_tracking_enter(enum ctx_state state);
extern void context_tracking_exit(enum ctx_state state);
extern void context_tracking_user_enter(void);
extern void context_tracking_user_exit(void);



static inline void user_enter(void)
{
	if (context_tracking_is_enabled())
		context_tracking_enter(CONTEXT_USER);

}
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Frédéric Weisbecker 15 78.95% 2 66.67%
Paolo Bonzini 4 21.05% 1 33.33%
Total 19 100.00% 3 100.00%



static inline void user_exit(void)
{
	if (context_tracking_is_enabled())
		context_tracking_exit(CONTEXT_USER);
}

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Person Tokens Prop Commits CommitProp
Frédéric Weisbecker 15 78.95% 2 66.67%
Paolo Bonzini 4 21.05% 1 33.33%
Total 19 100.00% 3 100.00%

/* Called with interrupts disabled.  */


static inline void user_enter_irqoff(void)
{
	if (context_tracking_is_enabled())
		__context_tracking_enter(CONTEXT_USER);

}
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Paolo Bonzini 19 100.00% 1 100.00%
Total 19 100.00% 1 100.00%



static inline void user_exit_irqoff(void)
{
	if (context_tracking_is_enabled())
		__context_tracking_exit(CONTEXT_USER);
}

Contributors
Person Tokens Prop Commits CommitProp
Paolo Bonzini 19 100.00% 1 100.00%
Total 19 100.00% 1 100.00%



static inline enum ctx_state exception_enter(void)
{
	enum ctx_state prev_ctx;

	if (!context_tracking_is_enabled())
		return 0;

	prev_ctx = this_cpu_read(context_tracking.state);
	if (prev_ctx != CONTEXT_KERNEL)
		context_tracking_exit(prev_ctx);

	return prev_ctx;
}

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Frédéric Weisbecker 36 78.26% 4 80.00%
Rik Van Riel 10 21.74% 1 20.00%
Total 46 100.00% 5 100.00%



static inline void exception_exit(enum ctx_state prev_ctx)
{
	if (context_tracking_is_enabled()) {
		if (prev_ctx != CONTEXT_KERNEL)
			context_tracking_enter(prev_ctx);
	}
}


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Person Tokens Prop Commits CommitProp
Frédéric Weisbecker 23 79.31% 4 80.00%
Rik Van Riel 6 20.69% 1 20.00%
Total 29 100.00% 5 100.00%

/**
 * ct_state() - return the current context tracking state if known
 *
 * Returns the current cpu's context tracking state if context tracking
 * is enabled.  If context tracking is disabled, returns
 * CONTEXT_DISABLED.  This should be used primarily for debugging.
 */


static inline enum ctx_state ct_state(void)
{
	return context_tracking_is_enabled() ?
		this_cpu_read(context_tracking.state) : CONTEXT_DISABLED;
}
Contributors
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Andrew Lutomirski 23 100.00% 1 100.00%
Total 23 100.00% 1 100.00%

#else


static inline void user_enter(void) { }
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Frédéric Weisbecker 8 100.00% 1 100.00%
Total 8 100.00% 1 100.00%



static inline void user_exit(void) { }
Contributors
Person Tokens Prop Commits CommitProp
Frédéric Weisbecker 8 100.00% 1 100.00%
Total 8 100.00% 1 100.00%



static inline void user_enter_irqoff(void) { }
Contributors
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Paolo Bonzini 8 100.00% 1 100.00%
Total 8 100.00% 1 100.00%



static inline void user_exit_irqoff(void) { }
Contributors
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Paolo Bonzini 8 100.00% 1 100.00%
Total 8 100.00% 1 100.00%



static inline enum ctx_state exception_enter(void) { return 0; }
Contributors
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Frédéric Weisbecker 13 100.00% 2 100.00%
Total 13 100.00% 2 100.00%



static inline void exception_exit(enum ctx_state prev_ctx) { }
Contributors
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Frédéric Weisbecker 10 100.00% 3 100.00%
Total 10 100.00% 3 100.00%



static inline enum ctx_state ct_state(void) { return CONTEXT_DISABLED; }
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Andrew Lutomirski 13 100.00% 1 100.00%
Total 13 100.00% 1 100.00%

#endif /* !CONFIG_CONTEXT_TRACKING */


#define CT_WARN_ON(cond) WARN_ON(context_tracking_is_enabled() && (cond))

#ifdef CONFIG_CONTEXT_TRACKING_FORCE
extern void context_tracking_init(void);
#else


static inline void context_tracking_init(void) { }
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Frédéric Weisbecker 8 100.00% 1 100.00%
Total 8 100.00% 1 100.00%

#endif /* CONFIG_CONTEXT_TRACKING_FORCE */


#ifdef CONFIG_VIRT_CPU_ACCOUNTING_GEN
/* must be called with irqs disabled */


static inline void guest_enter_irqoff(void)
{
	if (vtime_accounting_cpu_enabled())
		vtime_guest_enter(current);
	else
		current->flags |= PF_VCPU;

	if (context_tracking_is_enabled())
		__context_tracking_enter(CONTEXT_GUEST);

	/* KVM does not hold any references to rcu protected data when it
         * switches CPU into a guest mode. In fact switching to a guest mode
         * is very similar to exiting to userspace from rcu point of view. In
         * addition CPU may stay in a guest mode for quite a long time (up to
         * one time slice). Lets treat guest mode as quiescent state, just like
         * we do with user-mode execution.
         */
	if (!context_tracking_cpu_is_enabled())
		rcu_virt_note_context_switch(smp_processor_id());
}

Contributors
Person Tokens Prop Commits CommitProp
Frédéric Weisbecker 25 51.02% 3 50.00%
Paolo Bonzini 15 30.61% 2 33.33%
Rik Van Riel 9 18.37% 1 16.67%
Total 49 100.00% 6 100.00%



static inline void guest_exit_irqoff(void)
{
	if (context_tracking_is_enabled())
		__context_tracking_exit(CONTEXT_GUEST);

	if (vtime_accounting_cpu_enabled())
		vtime_guest_exit(current);
	else
		current->flags &= ~PF_VCPU;
}

Contributors
Person Tokens Prop Commits CommitProp
Frédéric Weisbecker 26 70.27% 3 50.00%
Rik Van Riel 9 24.32% 1 16.67%
Paolo Bonzini 2 5.41% 2 33.33%
Total 37 100.00% 6 100.00%

#else


static inline void guest_enter_irqoff(void)
{
	/*
         * This is running in ioctl context so its safe
         * to assume that it's the stime pending cputime
         * to flush.
         */
	vtime_account_system(current);
	current->flags |= PF_VCPU;
	rcu_virt_note_context_switch(smp_processor_id());
}

Contributors
Person Tokens Prop Commits CommitProp
Frédéric Weisbecker 20 74.07% 2 66.67%
Paolo Bonzini 7 25.93% 1 33.33%
Total 27 100.00% 3 100.00%



static inline void guest_exit_irqoff(void)
{
	/* Flush the guest cputime we spent on the guest */
	vtime_account_system(current);
	current->flags &= ~PF_VCPU;
}
Contributors
Person Tokens Prop Commits CommitProp
Frédéric Weisbecker 21 95.45% 2 66.67%
Paolo Bonzini 1 4.55% 1 33.33%
Total 22 100.00% 3 100.00%

#endif /* CONFIG_VIRT_CPU_ACCOUNTING_GEN */



static inline void guest_enter(void)
{
	unsigned long flags;

	local_irq_save(flags);
	guest_enter_irqoff();
	local_irq_restore(flags);
}

Contributors
Person Tokens Prop Commits CommitProp
Paolo Bonzini 26 100.00% 1 100.00%
Total 26 100.00% 1 100.00%



static inline void guest_exit(void)
{
	unsigned long flags;

	local_irq_save(flags);
	guest_exit_irqoff();
	local_irq_restore(flags);
}

Contributors
Person Tokens Prop Commits CommitProp
Paolo Bonzini 26 100.00% 1 100.00%
Total 26 100.00% 1 100.00%

#endif
Overall Contributors
Person Tokens Prop Commits CommitProp
Frédéric Weisbecker 301 54.04% 14 66.67%
Paolo Bonzini 160 28.73% 4 19.05%
Rik Van Riel 52 9.34% 2 9.52%
Andrew Lutomirski 44 7.90% 1 4.76%
Total 557 100.00% 21 100.00%
Directory: include/linux

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Person	Tokens	Prop	Commits	CommitProp
Frédéric Weisbecker	15	78.95%	2	66.67%
Paolo Bonzini	4	21.05%	1	33.33%
Total	19	100.00%	3	100.00%
cregit-Linux how code gets into the kernel

Release 4.12 include/linux/context_tracking.h

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