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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 state
import (
"bytes"
"fmt"
"sort"
"time"
)
type statEntry struct {
count uint
total time.Duration
}
// Stats tracks encode / decode timing.
//
// This currently provides a meaningful String function and no other way to
// extract stats about individual types.
//
// All exported receivers accept nil.
type Stats struct {
// byType contains a breakdown of time spent by type.
//
// This is indexed *directly* by typeID, including zero.
byType []statEntry
// stack contains objects in progress.
stack []typeID
// names contains type names.
//
// This is also indexed *directly* by typeID, including zero, which we
// hard-code as "state.default". This is only resolved by calling fini
// on the stats object.
names []string
// last is the last start time.
last time.Time
}
// init initializes statistics.
func (s *Stats) init() {
s.last = time.Now()
s.stack = append(s.stack, 0)
}
// fini finalizes statistics.
func (s *Stats) fini(resolve func(id typeID) string) {
s.done()
// Resolve all type names.
s.names = make([]string, len(s.byType))
s.names[0] = "state.default" // See above.
for id := typeID(1); int(id) < len(s.names); id++ {
s.names[id] = resolve(id)
}
}
// sample adds the samples to the given object.
func (s *Stats) sample(id typeID) {
now := time.Now()
if len(s.byType) <= int(id) {
// Allocate all the missing entries in one fell swoop.
s.byType = append(s.byType, make([]statEntry, 1+int(id)-len(s.byType))...)
}
s.byType[id].total += now.Sub(s.last)
s.last = now
}
// start starts a sample.
func (s *Stats) start(id typeID) {
last := s.stack[len(s.stack)-1]
s.sample(last)
s.stack = append(s.stack, id)
}
// done finishes the current sample.
func (s *Stats) done() {
last := s.stack[len(s.stack)-1]
s.sample(last)
s.byType[last].count++
s.stack = s.stack[:len(s.stack)-1]
}
type sliceEntry struct {
name string
entry *statEntry
}
// String returns a table representation of the stats.
func (s *Stats) String() string {
// Build a list of stat entries.
ss := make([]sliceEntry, 0, len(s.byType))
for id := 0; id < len(s.names); id++ {
ss = append(ss, sliceEntry{
name: s.names[id],
entry: &s.byType[id],
})
}
// Sort by total time (descending).
sort.Slice(ss, func(i, j int) bool {
return ss[i].entry.total > ss[j].entry.total
})
// Print the stat results.
var (
buf bytes.Buffer
count uint
total time.Duration
)
buf.WriteString("\n")
buf.WriteString(fmt.Sprintf("% 16s | % 8s | % 16s | %s\n", "total", "count", "per", "type"))
buf.WriteString("-----------------+----------+------------------+----------------\n")
for _, se := range ss {
if se.entry.count == 0 {
// Since we store all types linearly, we are not
// guaranteed that any entry actually has time.
continue
}
count += se.entry.count
total += se.entry.total
per := se.entry.total / time.Duration(se.entry.count)
buf.WriteString(fmt.Sprintf("% 16s | %8d | % 16s | %s\n",
se.entry.total, se.entry.count, per, se.name))
}
buf.WriteString("-----------------+----------+------------------+----------------\n")
buf.WriteString(fmt.Sprintf("% 16s | % 8d | % 16s | [all]",
total, count, total/time.Duration(count)))
return string(buf.Bytes())
}
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