[linux-2.6-block.git] / include / linux / psi_types.h

#ifndef _LINUX_PSI_TYPES_H
#define _LINUX_PSI_TYPES_H

#include <linux/seqlock.h>
#include <linux/types.h>

#ifdef CONFIG_PSI

/* Tracked task states */
enum psi_task_count {
	NR_IOWAIT,
	NR_MEMSTALL,
	NR_RUNNING,
	NR_PSI_TASK_COUNTS,
};

/* Task state bitmasks */
#define TSK_IOWAIT	(1 << NR_IOWAIT)
#define TSK_MEMSTALL	(1 << NR_MEMSTALL)
#define TSK_RUNNING	(1 << NR_RUNNING)

/* Resources that workloads could be stalled on */
enum psi_res {
	PSI_IO,
	PSI_MEM,
	PSI_CPU,
	NR_PSI_RESOURCES,
};

/*
 * Pressure states for each resource:
 *
 * SOME: Stalled tasks & working tasks
 * FULL: Stalled tasks & no working tasks
 */
enum psi_states {
	PSI_IO_SOME,
	PSI_IO_FULL,
	PSI_MEM_SOME,
	PSI_MEM_FULL,
	PSI_CPU_SOME,
	/* Only per-CPU, to weigh the CPU in the global average: */
	PSI_NONIDLE,
	NR_PSI_STATES,
};

struct psi_group_cpu {
	/* 1st cacheline updated by the scheduler */

	/* Aggregator needs to know of concurrent changes */
	seqcount_t seq ____cacheline_aligned_in_smp;

	/* States of the tasks belonging to this group */
	unsigned int tasks[NR_PSI_TASK_COUNTS];

	/* Period time sampling buckets for each state of interest (ns) */
	u32 times[NR_PSI_STATES];

	/* Time of last task change in this group (rq_clock) */
	u64 state_start;

	/* 2nd cacheline updated by the aggregator */

	/* Delta detection against the sampling buckets */
	u32 times_prev[NR_PSI_STATES] ____cacheline_aligned_in_smp;
};

struct psi_group {
	/* Protects data updated during an aggregation */
	struct mutex stat_lock;

	/* Per-cpu task state & time tracking */
	struct psi_group_cpu __percpu *pcpu;

	/* Periodic aggregation state */
	u64 total_prev[NR_PSI_STATES - 1];
	u64 last_update;
	u64 next_update;
	struct delayed_work clock_work;

	/* Total stall times and sampled pressure averages */
	u64 total[NR_PSI_STATES - 1];
	unsigned long avg[NR_PSI_STATES - 1][3];
};

#else /* CONFIG_PSI */

struct psi_group { };

#endif /* CONFIG_PSI */

#endif /* _LINUX_PSI_TYPES_H */
Commit	Line	Data
eb414681 JW	1	#ifndef _LINUX_PSI_TYPES_H
	2	#define _LINUX_PSI_TYPES_H
	3
	4	#include <linux/seqlock.h>
	5	#include <linux/types.h>
	6
	7	#ifdef CONFIG_PSI
	8
	9	/* Tracked task states */
	10	enum psi_task_count {
	11	NR_IOWAIT,
	12	NR_MEMSTALL,
	13	NR_RUNNING,
	14	NR_PSI_TASK_COUNTS,
	15	};
	16
	17	/* Task state bitmasks */
	18	#define TSK_IOWAIT (1 << NR_IOWAIT)
	19	#define TSK_MEMSTALL (1 << NR_MEMSTALL)
	20	#define TSK_RUNNING (1 << NR_RUNNING)
	21
	22	/* Resources that workloads could be stalled on */
	23	enum psi_res {
	24	PSI_IO,
	25	PSI_MEM,
	26	PSI_CPU,
	27	NR_PSI_RESOURCES,
	28	};
	29
	30	/*
	31	* Pressure states for each resource:
	32	*
	33	* SOME: Stalled tasks & working tasks
	34	* FULL: Stalled tasks & no working tasks
	35	*/
	36	enum psi_states {
	37	PSI_IO_SOME,
	38	PSI_IO_FULL,
	39	PSI_MEM_SOME,
	40	PSI_MEM_FULL,
	41	PSI_CPU_SOME,
	42	/* Only per-CPU, to weigh the CPU in the global average: */
	43	PSI_NONIDLE,
	44	NR_PSI_STATES,
	45	};
	46
	47	struct psi_group_cpu {
	48	/* 1st cacheline updated by the scheduler */
	49
	50	/* Aggregator needs to know of concurrent changes */
	51	seqcount_t seq ____cacheline_aligned_in_smp;
	52
	53	/* States of the tasks belonging to this group */
	54	unsigned int tasks[NR_PSI_TASK_COUNTS];
	55
	56	/* Period time sampling buckets for each state of interest (ns) */
	57	u32 times[NR_PSI_STATES];
	58
	59	/* Time of last task change in this group (rq_clock) */
	60	u64 state_start;
	61
	62	/* 2nd cacheline updated by the aggregator */
	63
	64	/* Delta detection against the sampling buckets */
65	u32 times_prev[NR_PSI_STATES] ____cacheline_aligned_in_smp;
66	};
67
68	struct psi_group {
69	/* Protects data updated during an aggregation */
70	struct mutex stat_lock;
71
72	/* Per-cpu task state & time tracking */
73	struct psi_group_cpu __percpu *pcpu;
74
75	/* Periodic aggregation state */
76	u64 total_prev[NR_PSI_STATES - 1];
77	u64 last_update;
78	u64 next_update;
79	struct delayed_work clock_work;
80
81	/* Total stall times and sampled pressure averages */
82	u64 total[NR_PSI_STATES - 1];
83	unsigned long avg[NR_PSI_STATES - 1][3];
84	};
85
86	#else /* CONFIG_PSI */
87
88	struct psi_group { };
89
90	#endif /* CONFIG_PSI */
91
92	#endif /* _LINUX_PSI_TYPES_H */