include/linux/flex_proportions.h

Source file repositories/reference/linux-study-clean/include/linux/flex_proportions.h

File Facts

System
Linux kernel
Corpus path
include/linux/flex_proportions.h
Extension
.h
Size
2023 bytes
Lines
73
Domain
Core OS
Bucket
Core Kernel Interface
Inferred role
Core OS: implementation source
Status
source implementation candidate

Why This File Exists

Core operating-system implementation surface: boot, tasks, memory, VFS, syscall-facing interfaces, synchronization, credentials, and isolation.

Dependency Surface

Detected Declarations

Annotated Snippet

struct fprop_global {
	/* Number of events in the current period */
	struct percpu_counter events;
	/* Current period */
	unsigned int period;
	/* Synchronization with period transitions */
	seqcount_t sequence;
};

int fprop_global_init(struct fprop_global *p, gfp_t gfp);
void fprop_global_destroy(struct fprop_global *p);
bool fprop_new_period(struct fprop_global *p, int periods);

/*
 * ---- PERCPU ----
 */
struct fprop_local_percpu {
	/* the local events counter */
	struct percpu_counter events;
	/* Period in which we last updated events */
	unsigned int period;
	raw_spinlock_t lock;	/* Protect period and numerator */
};

int fprop_local_init_percpu(struct fprop_local_percpu *pl, gfp_t gfp);
void fprop_local_destroy_percpu(struct fprop_local_percpu *pl);
void __fprop_add_percpu(struct fprop_global *p, struct fprop_local_percpu *pl,
		long nr);
void __fprop_add_percpu_max(struct fprop_global *p,
		struct fprop_local_percpu *pl, int max_frac, long nr);
void fprop_fraction_percpu(struct fprop_global *p,
	struct fprop_local_percpu *pl, unsigned long *numerator,
	unsigned long *denominator);

static inline
void fprop_inc_percpu(struct fprop_global *p, struct fprop_local_percpu *pl)
{
	unsigned long flags;

	local_irq_save(flags);
	__fprop_add_percpu(p, pl, 1);
	local_irq_restore(flags);
}

#endif

Annotation

Implementation Notes