58135f574f
Use a function with a meaningful name to check the global context tracking state. static_key_false() is a bit confusing for reviewers. Signed-off-by: Frederic Weisbecker <fweisbec@gmail.com> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: Ingo Molnar <mingo@kernel.org> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Oleg Nesterov <oleg@redhat.com> Cc: Steven Rostedt <rostedt@goodmis.org>
112 lines
2.5 KiB
C
112 lines
2.5 KiB
C
#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);
|
|
|
|
extern void context_tracking_user_enter(void);
|
|
extern void context_tracking_user_exit(void);
|
|
extern void __context_tracking_task_switch(struct task_struct *prev,
|
|
struct task_struct *next);
|
|
|
|
static inline void user_enter(void)
|
|
{
|
|
if (context_tracking_is_enabled())
|
|
context_tracking_user_enter();
|
|
|
|
}
|
|
static inline void user_exit(void)
|
|
{
|
|
if (context_tracking_is_enabled())
|
|
context_tracking_user_exit();
|
|
}
|
|
|
|
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);
|
|
context_tracking_user_exit();
|
|
|
|
return prev_ctx;
|
|
}
|
|
|
|
static inline void exception_exit(enum ctx_state prev_ctx)
|
|
{
|
|
if (context_tracking_is_enabled()) {
|
|
if (prev_ctx == IN_USER)
|
|
context_tracking_user_enter();
|
|
}
|
|
}
|
|
|
|
static inline void context_tracking_task_switch(struct task_struct *prev,
|
|
struct task_struct *next)
|
|
{
|
|
if (context_tracking_is_enabled())
|
|
__context_tracking_task_switch(prev, next);
|
|
}
|
|
#else
|
|
static inline void user_enter(void) { }
|
|
static inline void user_exit(void) { }
|
|
static inline enum ctx_state exception_enter(void) { return 0; }
|
|
static inline void exception_exit(enum ctx_state prev_ctx) { }
|
|
static inline void context_tracking_task_switch(struct task_struct *prev,
|
|
struct task_struct *next) { }
|
|
#endif /* !CONFIG_CONTEXT_TRACKING */
|
|
|
|
|
|
#ifdef CONFIG_CONTEXT_TRACKING_FORCE
|
|
extern void context_tracking_init(void);
|
|
#else
|
|
static inline void context_tracking_init(void) { }
|
|
#endif /* CONFIG_CONTEXT_TRACKING_FORCE */
|
|
|
|
|
|
#ifdef CONFIG_VIRT_CPU_ACCOUNTING_GEN
|
|
static inline void guest_enter(void)
|
|
{
|
|
if (vtime_accounting_enabled())
|
|
vtime_guest_enter(current);
|
|
else
|
|
current->flags |= PF_VCPU;
|
|
}
|
|
|
|
static inline void guest_exit(void)
|
|
{
|
|
if (vtime_accounting_enabled())
|
|
vtime_guest_exit(current);
|
|
else
|
|
current->flags &= ~PF_VCPU;
|
|
}
|
|
|
|
#else
|
|
static inline void guest_enter(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;
|
|
}
|
|
|
|
static inline void guest_exit(void)
|
|
{
|
|
/* Flush the guest cputime we spent on the guest */
|
|
vtime_account_system(current);
|
|
current->flags &= ~PF_VCPU;
|
|
}
|
|
#endif /* CONFIG_VIRT_CPU_ACCOUNTING_GEN */
|
|
|
|
#endif
|