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// Copyright 2019 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 proc
import (
"bytes"
"fmt"
"gvisor.dev/gvisor/pkg/abi/linux"
"gvisor.dev/gvisor/pkg/sentry/context"
"gvisor.dev/gvisor/pkg/sentry/kernel"
"gvisor.dev/gvisor/pkg/sentry/vfs"
)
// 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)
}
// statData implements vfs.DynamicBytesSource for /proc/stat.
//
// +stateify savable
type statData struct {
// k is the owning Kernel.
k *kernel.Kernel
}
var _ vfs.DynamicBytesSource = (*statData)(nil)
// Generate implements vfs.DynamicBytesSource.Generate.
func (s *statData) Generate(ctx context.Context, buf *bytes.Buffer) error {
// TODO(b/37226836): 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(b/37226836): 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(b/37226836): 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(b/37226836): Count this.
fmt.Fprintf(buf, "processes 0\n")
// Number of runnable tasks.
// TODO(b/37226836): Count this.
fmt.Fprintf(buf, "procs_running 0\n")
// Number of tasks waiting on IO.
// TODO(b/37226836): 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 nil
}
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