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git.proxmox.com Git - mirror_ubuntu-eoan-kernel.git/blob - include/linux/ioprio.h
4 #include <linux/sched.h>
7 * Gives us 8 prio classes with 13-bits of data for each class
9 #define IOPRIO_BITS (16)
10 #define IOPRIO_CLASS_SHIFT (13)
11 #define IOPRIO_PRIO_MASK ((1UL << IOPRIO_CLASS_SHIFT) - 1)
13 #define IOPRIO_PRIO_CLASS(mask) ((mask) >> IOPRIO_CLASS_SHIFT)
14 #define IOPRIO_PRIO_DATA(mask) ((mask) & IOPRIO_PRIO_MASK)
15 #define IOPRIO_PRIO_VALUE(class, data) (((class) << IOPRIO_CLASS_SHIFT) | data)
17 #define ioprio_valid(mask) (IOPRIO_PRIO_CLASS((mask)) != IOPRIO_CLASS_NONE)
20 * These are the io priority groups as implemented by CFQ. RT is the realtime
21 * class, it always gets premium service. BE is the best-effort scheduling
22 * class, the default for any process. IDLE is the idle scheduling class, it
23 * is only served when no one else is using the disk.
33 * 8 best effort priority levels are supported
35 #define IOPRIO_BE_NR (8)
38 IOPRIO_WHO_PROCESS
= 1,
44 * if process has set io priority explicitly, use that. if not, convert
45 * the cpu scheduler nice value to an io priority
47 #define IOPRIO_NORM (4)
48 static inline int task_ioprio(struct task_struct
*task
)
50 WARN_ON(!ioprio_valid(task
->ioprio
));
51 return IOPRIO_PRIO_DATA(task
->ioprio
);
54 static inline int task_nice_ioprio(struct task_struct
*task
)
56 return (task_nice(task
) + 20) / 5;
60 * For inheritance, return the highest of the two given priorities
62 extern int ioprio_best(unsigned short aprio
, unsigned short bprio
);