mirror of
https://github.com/hanzoai/visor.git
synced 2026-09-24 17:04:14 +00:00
Ryan El KochtaandgVisor bot
6d0da34f53
Adds stub implementations for: - sched_setattr(2) - sched_getattr(2) - ioprio_set(2) - ioprio_get(2) "Support" (with no effect) is included for SCHED_OTHER (referred to in Linux as SCHED_NORMAL), SCHED_BATCH, and SCHED_IDLE. sched_getscheduler(2) and sched_setscheduler(2) are updated to support all three as well. For ioprio_set, the configured I/O priority has no effect. PiperOrigin-RevId: 938270335
112 lines
2.6 KiB
Go
112 lines
2.6 KiB
Go
// Copyright 2018 The gVisor Authors.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package linux
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import "structs"
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// Scheduling policies, exposed by sched_getscheduler(2)/sched_setscheduler(2).
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const (
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SCHED_NORMAL = 0
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SCHED_FIFO = 1
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SCHED_RR = 2
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SCHED_BATCH = 3
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SCHED_IDLE = 5
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SCHED_DEADLINE = 6
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SCHED_MICROQ = 16
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// SCHED_RESET_ON_FORK is a flag that indicates that the process is
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// reverted back to SCHED_NORMAL on fork.
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SCHED_RESET_ON_FORK = 0x40000000
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)
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// Scheduling priority group selectors.
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const (
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PRIO_PGRP = 0x1
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PRIO_PROCESS = 0x0
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PRIO_USER = 0x2
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)
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// SchedAttr represents struct sched_attr, as used by sched_setattr(2) and sched_getattr(2).
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//
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// +marshal
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type SchedAttr struct {
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_ structs.HostLayout
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Size uint32
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SchedPolicy uint32
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SchedFlags uint64
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SchedNice int32
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SchedPriority uint32
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// For SCHED_DEADLINE
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SchedRuntime uint64
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SchedDeadline uint64
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SchedPeriod uint64
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// Utilization hints
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SchedUtilMin uint32
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SchedUtilMax uint32
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}
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// Sizes for different versions of the SchedAttr struct.
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const (
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SCHED_ATTR_SIZE_VER0 = 48
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SCHED_ATTR_SIZE_VER1 = 56
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SCHED_ATTR_SIZE_LATEST = SCHED_ATTR_SIZE_VER1
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)
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// Flags for sched_setattr.
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const (
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SCHED_FLAG_RESET_ON_FORK = 0x01
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SCHED_FLAG_RECLAIM = 0x02
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SCHED_FLAG_DL_OVERRUN = 0x04
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SCHED_FLAG_KEEP_POLICY = 0x08
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SCHED_FLAG_KEEP_PARAMS = 0x10
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SCHED_FLAG_UTIL_CLAMP_MIN = 0x20
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SCHED_FLAG_UTIL_CLAMP_MAX = 0x40
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)
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// I/O priority target types.
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const (
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IOPRIO_WHO_PROCESS = 1
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IOPRIO_WHO_PGRP = 2
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IOPRIO_WHO_USER = 3
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)
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// I/O priority classes.
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const (
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IOPRIO_CLASS_NONE = 0
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IOPRIO_CLASS_RT = 1
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IOPRIO_CLASS_BE = 2
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IOPRIO_CLASS_IDLE = 3
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)
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// I/O priority bitwise encoding constants.
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const (
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IOPRIO_CLASS_SHIFT = 13
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IOPRIO_NR_CLASSES = 8
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IOPRIO_CLASS_MASK = IOPRIO_NR_CLASSES - 1
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IOPRIO_PRIO_MASK = (1 << IOPRIO_CLASS_SHIFT) - 1
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)
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// UnwrapIOPrio unwraps the bitmask ioprio into its enclosed ioclass and data fields.
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func UnwrapIOPrio(ioprio int) (ioclass int8, iopriodata uint16) {
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ioclass = int8((ioprio >> IOPRIO_CLASS_SHIFT) & (IOPRIO_CLASS_MASK))
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iopriodata = uint16(ioprio & IOPRIO_PRIO_MASK)
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return
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}
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