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