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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 linux
import (
"gvisor.dev/gvisor/pkg/abi/linux"
"gvisor.dev/gvisor/pkg/errors/linuxerr"
"gvisor.dev/gvisor/pkg/sentry/arch"
"gvisor.dev/gvisor/pkg/sentry/kernel"
ktime "gvisor.dev/gvisor/pkg/sentry/kernel/time"
"gvisor.dev/gvisor/pkg/sentry/usage"
)
func getrusage(t *kernel.Task, which int32) linux.Rusage {
var cs usage.CPUStats
switch which {
case linux.RUSAGE_SELF:
cs = t.ThreadGroup().CPUStats()
case linux.RUSAGE_CHILDREN:
cs = t.ThreadGroup().JoinedChildCPUStats()
case linux.RUSAGE_THREAD:
cs = t.CPUStats()
case linux.RUSAGE_BOTH:
tg := t.ThreadGroup()
cs = tg.CPUStats()
cs.Accumulate(tg.JoinedChildCPUStats())
}
return linux.Rusage{
UTime: linux.NsecToTimeval(cs.UserTime.Nanoseconds()),
STime: linux.NsecToTimeval(cs.SysTime.Nanoseconds()),
NVCSw: int64(cs.VoluntarySwitches),
MaxRSS: int64(t.MaxRSS(which) / 1024),
}
}
// Getrusage implements linux syscall getrusage(2).
// marked "y" are supported now
// marked "*" are not used on Linux
// marked "p" are pending for support
//
// y struct timeval ru_utime; /* user CPU time used */
// y struct timeval ru_stime; /* system CPU time used */
// p long ru_maxrss; /* maximum resident set size */
// * long ru_ixrss; /* integral shared memory size */
// * long ru_idrss; /* integral unshared data size */
// * long ru_isrss; /* integral unshared stack size */
// p long ru_minflt; /* page reclaims (soft page faults) */
// p long ru_majflt; /* page faults (hard page faults) */
// * long ru_nswap; /* swaps */
// p long ru_inblock; /* block input operations */
// p long ru_oublock; /* block output operations */
// * long ru_msgsnd; /* IPC messages sent */
// * long ru_msgrcv; /* IPC messages received */
// * long ru_nsignals; /* signals received */
// y long ru_nvcsw; /* voluntary context switches */
// y long ru_nivcsw; /* involuntary context switches */
func Getrusage(t *kernel.Task, args arch.SyscallArguments) (uintptr, *kernel.SyscallControl, error) {
which := args[0].Int()
addr := args[1].Pointer()
if which != linux.RUSAGE_SELF && which != linux.RUSAGE_CHILDREN && which != linux.RUSAGE_THREAD {
return 0, nil, linuxerr.EINVAL
}
ru := getrusage(t, which)
_, err := ru.CopyOut(t, addr)
return 0, nil, err
}
// Times implements linux syscall times(2).
func Times(t *kernel.Task, args arch.SyscallArguments) (uintptr, *kernel.SyscallControl, error) {
addr := args[0].Pointer()
// Calculate the ticks first, and figure out if any additional work is
// necessary. Linux allows for a NULL addr, in which case only the
// return value is meaningful. We don't need to do anything else.
ticks := uintptr(ktime.NowFromContext(t).Nanoseconds() / linux.ClockTick.Nanoseconds())
if addr == 0 {
return ticks, nil, nil
}
cs1 := t.ThreadGroup().CPUStats()
cs2 := t.ThreadGroup().JoinedChildCPUStats()
r := linux.Tms{
UTime: linux.ClockTFromDuration(cs1.UserTime),
STime: linux.ClockTFromDuration(cs1.SysTime),
CUTime: linux.ClockTFromDuration(cs2.UserTime),
CSTime: linux.ClockTFromDuration(cs2.SysTime),
}
if _, err := r.CopyOut(t, addr); err != nil {
return 0, nil, err
}
return ticks, nil, nil
}
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