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include/linux/ioprio.h
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#ifndef IOPRIO_H #define IOPRIO_H #include <linux/sched.h> |
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#include <linux/iocontext.h> |
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/* * Gives us 8 prio classes with 13-bits of data for each class */ #define IOPRIO_BITS (16) #define IOPRIO_CLASS_SHIFT (13) #define IOPRIO_PRIO_MASK ((1UL << IOPRIO_CLASS_SHIFT) - 1) #define IOPRIO_PRIO_CLASS(mask) ((mask) >> IOPRIO_CLASS_SHIFT) #define IOPRIO_PRIO_DATA(mask) ((mask) & IOPRIO_PRIO_MASK) |
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#define IOPRIO_PRIO_VALUE(class, data) (((class) << IOPRIO_CLASS_SHIFT) | data) |
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#define ioprio_valid(mask) (IOPRIO_PRIO_CLASS((mask)) != IOPRIO_CLASS_NONE) /* * These are the io priority groups as implemented by CFQ. RT is the realtime * class, it always gets premium service. BE is the best-effort scheduling * class, the default for any process. IDLE is the idle scheduling class, it * is only served when no one else is using the disk. */ enum { IOPRIO_CLASS_NONE, IOPRIO_CLASS_RT, IOPRIO_CLASS_BE, IOPRIO_CLASS_IDLE, }; /* * 8 best effort priority levels are supported */ #define IOPRIO_BE_NR (8) |
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enum { IOPRIO_WHO_PROCESS = 1, IOPRIO_WHO_PGRP, IOPRIO_WHO_USER, }; /* * if process has set io priority explicitly, use that. if not, convert * the cpu scheduler nice value to an io priority */ #define IOPRIO_NORM (4) |
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static inline int task_ioprio(struct io_context *ioc) |
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{ |
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if (ioprio_valid(ioc->ioprio)) return IOPRIO_PRIO_DATA(ioc->ioprio); |
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return IOPRIO_NORM; |
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} |
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static inline int task_ioprio_class(struct io_context *ioc) |
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{ |
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if (ioprio_valid(ioc->ioprio)) return IOPRIO_PRIO_CLASS(ioc->ioprio); |
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return IOPRIO_CLASS_BE; } |
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static inline int task_nice_ioprio(struct task_struct *task) { return (task_nice(task) + 20) / 5; } /* |
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* This is for the case where the task hasn't asked for a specific IO class. * Check for idle and rt task process, and return appropriate IO class. */ static inline int task_nice_ioclass(struct task_struct *task) { if (task->policy == SCHED_IDLE) return IOPRIO_CLASS_IDLE; else if (task->policy == SCHED_FIFO || task->policy == SCHED_RR) return IOPRIO_CLASS_RT; else return IOPRIO_CLASS_BE; } /* |
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* For inheritance, return the highest of the two given priorities */ |
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extern int ioprio_best(unsigned short aprio, unsigned short bprio); |
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extern int set_task_ioprio(struct task_struct *task, int ioprio); |
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#endif |