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// Copyright 2018 The gVisor Authors.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package kernel
// Accounting, limits, timers.
import (
"gvisor.dev/gvisor/pkg/abi/linux"
ktime "gvisor.dev/gvisor/pkg/sentry/kernel/time"
"gvisor.dev/gvisor/pkg/sentry/limits"
"gvisor.dev/gvisor/pkg/sentry/usage"
"gvisor.dev/gvisor/pkg/syserror"
)
// Getitimer implements getitimer(2).
//
// Preconditions: The caller must be running on the task goroutine.
func (t *Task) Getitimer(id int32) (linux.ItimerVal, error) {
var tm ktime.Time
var s ktime.Setting
switch id {
case linux.ITIMER_REAL:
tm, s = t.tg.itimerRealTimer.Get()
case linux.ITIMER_VIRTUAL:
tm = t.tg.UserCPUClock().Now()
t.tg.signalHandlers.mu.Lock()
s, _ = t.tg.itimerVirtSetting.At(tm)
t.tg.signalHandlers.mu.Unlock()
case linux.ITIMER_PROF:
tm = t.tg.CPUClock().Now()
t.tg.signalHandlers.mu.Lock()
s, _ = t.tg.itimerProfSetting.At(tm)
t.tg.signalHandlers.mu.Unlock()
default:
return linux.ItimerVal{}, syserror.EINVAL
}
val, iv := ktime.SpecFromSetting(tm, s)
return linux.ItimerVal{
Value: linux.DurationToTimeval(val),
Interval: linux.DurationToTimeval(iv),
}, nil
}
// Setitimer implements setitimer(2).
//
// Preconditions: The caller must be running on the task goroutine.
func (t *Task) Setitimer(id int32, newitv linux.ItimerVal) (linux.ItimerVal, error) {
var tm ktime.Time
var olds ktime.Setting
switch id {
case linux.ITIMER_REAL:
news, err := ktime.SettingFromSpec(newitv.Value.ToDuration(), newitv.Interval.ToDuration(), t.tg.itimerRealTimer.Clock())
if err != nil {
return linux.ItimerVal{}, err
}
tm, olds = t.tg.itimerRealTimer.Swap(news)
case linux.ITIMER_VIRTUAL:
c := t.tg.UserCPUClock()
var err error
t.k.cpuClockTicker.Atomically(func() {
tm = c.Now()
var news ktime.Setting
news, err = ktime.SettingFromSpecAt(newitv.Value.ToDuration(), newitv.Interval.ToDuration(), tm)
if err != nil {
return
}
t.tg.signalHandlers.mu.Lock()
olds = t.tg.itimerVirtSetting
t.tg.itimerVirtSetting = news
t.tg.updateCPUTimersEnabledLocked()
t.tg.signalHandlers.mu.Unlock()
})
if err != nil {
return linux.ItimerVal{}, err
}
case linux.ITIMER_PROF:
c := t.tg.CPUClock()
var err error
t.k.cpuClockTicker.Atomically(func() {
tm = c.Now()
var news ktime.Setting
news, err = ktime.SettingFromSpecAt(newitv.Value.ToDuration(), newitv.Interval.ToDuration(), tm)
if err != nil {
return
}
t.tg.signalHandlers.mu.Lock()
olds = t.tg.itimerProfSetting
t.tg.itimerProfSetting = news
t.tg.updateCPUTimersEnabledLocked()
t.tg.signalHandlers.mu.Unlock()
})
if err != nil {
return linux.ItimerVal{}, err
}
default:
return linux.ItimerVal{}, syserror.EINVAL
}
oldval, oldiv := ktime.SpecFromSetting(tm, olds)
return linux.ItimerVal{
Value: linux.DurationToTimeval(oldval),
Interval: linux.DurationToTimeval(oldiv),
}, nil
}
// IOUsage returns the io usage of the thread.
func (t *Task) IOUsage() *usage.IO {
return t.ioUsage
}
// IOUsage returns the total io usage of all dead and live threads in the group.
func (tg *ThreadGroup) IOUsage() *usage.IO {
tg.pidns.owner.mu.RLock()
defer tg.pidns.owner.mu.RUnlock()
io := *tg.ioUsage
// Account for active tasks.
for t := tg.tasks.Front(); t != nil; t = t.Next() {
io.Accumulate(t.IOUsage())
}
return &io
}
// Name returns t's name.
func (t *Task) Name() string {
t.mu.Lock()
defer t.mu.Unlock()
return t.tc.Name
}
// SetName changes t's name.
func (t *Task) SetName(name string) {
t.mu.Lock()
defer t.mu.Unlock()
t.tc.Name = name
t.Debugf("Set thread name to %q", name)
}
// Limits implements context.Context.Limits.
func (t *Task) Limits() *limits.LimitSet {
return t.ThreadGroup().Limits()
}
// StartTime returns t's start time.
func (t *Task) StartTime() ktime.Time {
t.mu.Lock()
defer t.mu.Unlock()
return t.startTime
}
// MaxRSS returns the maximum resident set size of the task in bytes. which
// should be one of RUSAGE_SELF, RUSAGE_CHILDREN, RUSAGE_THREAD, or
// RUSAGE_BOTH. See getrusage(2) for documentation on the behavior of these
// flags.
func (t *Task) MaxRSS(which int32) uint64 {
t.tg.pidns.owner.mu.RLock()
defer t.tg.pidns.owner.mu.RUnlock()
switch which {
case linux.RUSAGE_SELF, linux.RUSAGE_THREAD:
// If there's an active mm we can use its value.
if mm := t.MemoryManager(); mm != nil {
if mmMaxRSS := mm.MaxResidentSetSize(); mmMaxRSS > t.tg.maxRSS {
return mmMaxRSS
}
}
return t.tg.maxRSS
case linux.RUSAGE_CHILDREN:
return t.tg.childMaxRSS
case linux.RUSAGE_BOTH:
maxRSS := t.tg.maxRSS
if maxRSS < t.tg.childMaxRSS {
maxRSS = t.tg.childMaxRSS
}
if mm := t.MemoryManager(); mm != nil {
if mmMaxRSS := mm.MaxResidentSetSize(); mmMaxRSS > maxRSS {
return mmMaxRSS
}
}
return maxRSS
default:
// We'll only get here if which is invalid.
return 0
}
}
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