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// Copyright 2018 Google Inc.
//
// 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 proc
import (
"bytes"
"fmt"
"gvisor.googlesource.com/gvisor/pkg/abi/linux"
"gvisor.googlesource.com/gvisor/pkg/sentry/fs/proc/seqfile"
"gvisor.googlesource.com/gvisor/pkg/sentry/kernel"
)
// statData backs /proc/stat.
type statData struct {
// k is the owning Kernel.
k *kernel.Kernel
}
// NeedsUpdate implements seqfile.SeqSource.NeedsUpdate.
func (*statData) NeedsUpdate(generation int64) bool {
return true
}
// cpuStats contains the breakdown of CPU time for /proc/stat.
type cpuStats struct {
// user is time spent in userspace tasks with non-positive niceness.
user uint64
// nice is time spent in userspace tasks with positive niceness.
nice uint64
// system is time spent in non-interrupt kernel context.
system uint64
// idle is time spent idle.
idle uint64
// ioWait is time spent waiting for IO.
ioWait uint64
// irq is time spent in interrupt context.
irq uint64
// softirq is time spent in software interrupt context.
softirq uint64
// steal is involuntary wait time.
steal uint64
// guest is time spent in guests with non-positive niceness.
guest uint64
// guestNice is time spent in guests with positive niceness.
guestNice uint64
}
// String implements fmt.Stringer.
func (c cpuStats) String() string {
return fmt.Sprintf("%d %d %d %d %d %d %d %d %d %d", c.user, c.nice, c.system, c.idle, c.ioWait, c.irq, c.softirq, c.steal, c.guest, c.guestNice)
}
// ReadSeqFileData implements seqfile.SeqSource.ReadSeqFileData.
func (s *statData) ReadSeqFileData(h seqfile.SeqHandle) ([]seqfile.SeqData, int64) {
if h != nil {
return nil, 0
}
var buf bytes.Buffer
// TODO: We currently export only zero CPU stats. We could
// at least provide some aggregate stats.
var cpu cpuStats
fmt.Fprintf(&buf, "cpu %s\n", cpu)
for c, max := uint(0), s.k.ApplicationCores(); c < max; c++ {
fmt.Fprintf(&buf, "cpu%d %s\n", c, cpu)
}
// The total number of interrupts is dependent on the CPUs and PCI
// devices on the system. See arch_probe_nr_irqs.
//
// Since we don't report real interrupt stats, just choose an arbitrary
// value from a representative VM.
const numInterrupts = 256
// The Kernel doesn't handle real interrupts, so report all zeroes.
// TODO: We could count page faults as #PF.
fmt.Fprintf(&buf, "intr 0") // total
for i := 0; i < numInterrupts; i++ {
fmt.Fprintf(&buf, " 0")
}
fmt.Fprintf(&buf, "\n")
// Total number of context switches.
// TODO: Count this.
fmt.Fprintf(&buf, "ctxt 0\n")
// CLOCK_REALTIME timestamp from boot, in seconds.
fmt.Fprintf(&buf, "btime %d\n", s.k.Timekeeper().BootTime().Seconds())
// Total number of clones.
// TODO: Count this.
fmt.Fprintf(&buf, "processes 0\n")
// Number of runnable tasks.
// TODO: Count this.
fmt.Fprintf(&buf, "procs_running 0\n")
// Number of tasks waiting on IO.
// TODO: Count this.
fmt.Fprintf(&buf, "procs_blocked 0\n")
// Number of each softirq handled.
fmt.Fprintf(&buf, "softirq 0") // total
for i := 0; i < linux.NumSoftIRQ; i++ {
fmt.Fprintf(&buf, " 0")
}
fmt.Fprintf(&buf, "\n")
return []seqfile.SeqData{
{
Buf: buf.Bytes(),
Handle: (*statData)(nil),
},
}, 0
}
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