1 // Copyright 2017 The Go Authors. All rights reserved. 2 // Use of this source code is governed by a BSD-style 3 // license that can be found in the LICENSE file. 4 5 package runtime_test 6 7 import ( 8 "reflect" 9 . "runtime" 10 "testing" 11 "time" 12 "unsafe" 13 ) 14 15 func TestProfBuf(t *testing.T) { 16 const hdrSize = 2 17 18 write := func(t *testing.T, b *ProfBuf, tag unsafe.Pointer, now int64, hdr []uint64, stk []uintptr) { 19 b.Write(&tag, now, hdr, stk) 20 } 21 read := func(t *testing.T, b *ProfBuf, data []uint64, tags []unsafe.Pointer) { 22 rdata, rtags, eof := b.Read(ProfBufNonBlocking) 23 if !reflect.DeepEqual(rdata, data) || !reflect.DeepEqual(rtags, tags) { 24 t.Fatalf("unexpected profile read:\nhave data %#x\nwant data %#x\nhave tags %#x\nwant tags %#x", rdata, data, rtags, tags) 25 } 26 if eof { 27 t.Fatalf("unexpected eof") 28 } 29 } 30 readBlock := func(t *testing.T, b *ProfBuf, data []uint64, tags []unsafe.Pointer) func() { 31 c := make(chan int) 32 go func() { 33 eof := data == nil 34 rdata, rtags, reof := b.Read(ProfBufBlocking) 35 if !reflect.DeepEqual(rdata, data) || !reflect.DeepEqual(rtags, tags) || reof != eof { 36 // Errorf, not Fatalf, because called in goroutine. 37 t.Errorf("unexpected profile read:\nhave data %#x\nwant data %#x\nhave tags %#x\nwant tags %#x\nhave eof=%v, want %v", rdata, data, rtags, tags, reof, eof) 38 } 39 c <- 1 40 }() 41 time.Sleep(10 * time.Millisecond) // let goroutine run and block 42 return func() { 43 select { 44 case <-c: 45 case <-time.After(1 * time.Second): 46 t.Fatalf("timeout waiting for blocked read") 47 } 48 } 49 } 50 readEOF := func(t *testing.T, b *ProfBuf) { 51 rdata, rtags, eof := b.Read(ProfBufBlocking) 52 if rdata != nil || rtags != nil || !eof { 53 t.Errorf("unexpected profile read: %#x, %#x, eof=%v; want nil, nil, eof=true", rdata, rtags, eof) 54 } 55 rdata, rtags, eof = b.Read(ProfBufNonBlocking) 56 if rdata != nil || rtags != nil || !eof { 57 t.Errorf("unexpected profile read (non-blocking): %#x, %#x, eof=%v; want nil, nil, eof=true", rdata, rtags, eof) 58 } 59 } 60 61 myTags := make([]byte, 100) 62 t.Logf("myTags is %p", &myTags[0]) 63 64 t.Run("BasicWriteRead", func(t *testing.T) { 65 b := NewProfBuf(2, 11, 1) 66 write(t, b, unsafe.Pointer(&myTags[0]), 1, []uint64{2, 3}, []uintptr{4, 5, 6, 7, 8, 9}) 67 read(t, b, []uint64{10, 1, 2, 3, 4, 5, 6, 7, 8, 9}, []unsafe.Pointer{unsafe.Pointer(&myTags[0])}) 68 read(t, b, nil, nil) // release data returned by previous read 69 write(t, b, unsafe.Pointer(&myTags[2]), 99, []uint64{101, 102}, []uintptr{201, 202, 203, 204}) 70 read(t, b, []uint64{8, 99, 101, 102, 201, 202, 203, 204}, []unsafe.Pointer{unsafe.Pointer(&myTags[2])}) 71 }) 72 73 t.Run("ReadMany", func(t *testing.T) { 74 b := NewProfBuf(2, 50, 50) 75 write(t, b, unsafe.Pointer(&myTags[0]), 1, []uint64{2, 3}, []uintptr{4, 5, 6, 7, 8, 9}) 76 write(t, b, unsafe.Pointer(&myTags[2]), 99, []uint64{101, 102}, []uintptr{201, 202, 203, 204}) 77 write(t, b, unsafe.Pointer(&myTags[1]), 500, []uint64{502, 504}, []uintptr{506}) 78 read(t, b, []uint64{10, 1, 2, 3, 4, 5, 6, 7, 8, 9, 8, 99, 101, 102, 201, 202, 203, 204, 5, 500, 502, 504, 506}, []unsafe.Pointer{unsafe.Pointer(&myTags[0]), unsafe.Pointer(&myTags[2]), unsafe.Pointer(&myTags[1])}) 79 }) 80 81 t.Run("ReadManyShortData", func(t *testing.T) { 82 b := NewProfBuf(2, 50, 50) 83 write(t, b, unsafe.Pointer(&myTags[0]), 1, []uint64{2, 3}, []uintptr{4, 5, 6, 7, 8, 9}) 84 write(t, b, unsafe.Pointer(&myTags[2]), 99, []uint64{101, 102}, []uintptr{201, 202, 203, 204}) 85 read(t, b, []uint64{10, 1, 2, 3, 4, 5, 6, 7, 8, 9, 8, 99, 101, 102, 201, 202, 203, 204}, []unsafe.Pointer{unsafe.Pointer(&myTags[0]), unsafe.Pointer(&myTags[2])}) 86 }) 87 88 t.Run("ReadManyShortTags", func(t *testing.T) { 89 b := NewProfBuf(2, 50, 50) 90 write(t, b, unsafe.Pointer(&myTags[0]), 1, []uint64{2, 3}, []uintptr{4, 5, 6, 7, 8, 9}) 91 write(t, b, unsafe.Pointer(&myTags[2]), 99, []uint64{101, 102}, []uintptr{201, 202, 203, 204}) 92 read(t, b, []uint64{10, 1, 2, 3, 4, 5, 6, 7, 8, 9, 8, 99, 101, 102, 201, 202, 203, 204}, []unsafe.Pointer{unsafe.Pointer(&myTags[0]), unsafe.Pointer(&myTags[2])}) 93 }) 94 95 t.Run("ReadAfterOverflow1", func(t *testing.T) { 96 // overflow record synthesized by write 97 b := NewProfBuf(2, 16, 5) 98 write(t, b, unsafe.Pointer(&myTags[0]), 1, []uint64{2, 3}, []uintptr{4, 5, 6, 7, 8, 9}) // uses 10 99 read(t, b, []uint64{10, 1, 2, 3, 4, 5, 6, 7, 8, 9}, []unsafe.Pointer{unsafe.Pointer(&myTags[0])}) // reads 10 but still in use until next read 100 write(t, b, unsafe.Pointer(&myTags[0]), 1, []uint64{2, 3}, []uintptr{4, 5}) // uses 6 101 read(t, b, []uint64{6, 1, 2, 3, 4, 5}, []unsafe.Pointer{unsafe.Pointer(&myTags[0])}) // reads 6 but still in use until next read 102 // now 10 available 103 write(t, b, unsafe.Pointer(&myTags[2]), 99, []uint64{101, 102}, []uintptr{201, 202, 203, 204, 205, 206, 207, 208, 209}) // no room 104 for i := 0; i < 299; i++ { 105 write(t, b, unsafe.Pointer(&myTags[3]), int64(100+i), []uint64{101, 102}, []uintptr{201, 202, 203, 204}) // no room for overflow+this record 106 } 107 write(t, b, unsafe.Pointer(&myTags[1]), 500, []uint64{502, 504}, []uintptr{506}) // room for overflow+this record 108 read(t, b, []uint64{5, 99, 0, 0, 300, 5, 500, 502, 504, 506}, []unsafe.Pointer{nil, unsafe.Pointer(&myTags[1])}) 109 }) 110 111 t.Run("ReadAfterOverflow2", func(t *testing.T) { 112 // overflow record synthesized by read 113 b := NewProfBuf(2, 16, 5) 114 write(t, b, unsafe.Pointer(&myTags[0]), 1, []uint64{2, 3}, []uintptr{4, 5, 6, 7, 8, 9}) 115 write(t, b, unsafe.Pointer(&myTags[2]), 99, []uint64{101, 102}, []uintptr{201, 202, 203, 204, 205, 206, 207, 208, 209, 210, 211, 212, 213}) 116 for i := 0; i < 299; i++ { 117 write(t, b, unsafe.Pointer(&myTags[3]), 100, []uint64{101, 102}, []uintptr{201, 202, 203, 204}) 118 } 119 read(t, b, []uint64{10, 1, 2, 3, 4, 5, 6, 7, 8, 9}, []unsafe.Pointer{unsafe.Pointer(&myTags[0])}) // reads 10 but still in use until next read 120 write(t, b, unsafe.Pointer(&myTags[1]), 500, []uint64{502, 504}, []uintptr{}) // still overflow 121 read(t, b, []uint64{5, 99, 0, 0, 301}, []unsafe.Pointer{nil}) // overflow synthesized by read 122 write(t, b, unsafe.Pointer(&myTags[1]), 500, []uint64{502, 505}, []uintptr{506}) // written 123 read(t, b, []uint64{5, 500, 502, 505, 506}, []unsafe.Pointer{unsafe.Pointer(&myTags[1])}) 124 }) 125 126 t.Run("ReadAtEndAfterOverflow", func(t *testing.T) { 127 b := NewProfBuf(2, 12, 5) 128 write(t, b, unsafe.Pointer(&myTags[0]), 1, []uint64{2, 3}, []uintptr{4, 5, 6, 7, 8, 9}) 129 write(t, b, unsafe.Pointer(&myTags[2]), 99, []uint64{101, 102}, []uintptr{201, 202, 203, 204}) 130 for i := 0; i < 299; i++ { 131 write(t, b, unsafe.Pointer(&myTags[3]), 100, []uint64{101, 102}, []uintptr{201, 202, 203, 204}) 132 } 133 read(t, b, []uint64{10, 1, 2, 3, 4, 5, 6, 7, 8, 9}, []unsafe.Pointer{unsafe.Pointer(&myTags[0])}) 134 read(t, b, []uint64{5, 99, 0, 0, 300}, []unsafe.Pointer{nil}) 135 write(t, b, unsafe.Pointer(&myTags[1]), 500, []uint64{502, 504}, []uintptr{506}) 136 read(t, b, []uint64{5, 500, 502, 504, 506}, []unsafe.Pointer{unsafe.Pointer(&myTags[1])}) 137 }) 138 139 t.Run("BlockingWriteRead", func(t *testing.T) { 140 b := NewProfBuf(2, 11, 1) 141 wait := readBlock(t, b, []uint64{10, 1, 2, 3, 4, 5, 6, 7, 8, 9}, []unsafe.Pointer{unsafe.Pointer(&myTags[0])}) 142 write(t, b, unsafe.Pointer(&myTags[0]), 1, []uint64{2, 3}, []uintptr{4, 5, 6, 7, 8, 9}) 143 wait() 144 wait = readBlock(t, b, []uint64{8, 99, 101, 102, 201, 202, 203, 204}, []unsafe.Pointer{unsafe.Pointer(&myTags[2])}) 145 time.Sleep(10 * time.Millisecond) 146 write(t, b, unsafe.Pointer(&myTags[2]), 99, []uint64{101, 102}, []uintptr{201, 202, 203, 204}) 147 wait() 148 wait = readBlock(t, b, nil, nil) 149 b.Close() 150 wait() 151 wait = readBlock(t, b, nil, nil) 152 wait() 153 readEOF(t, b) 154 }) 155 156 t.Run("DataWraparound", func(t *testing.T) { 157 b := NewProfBuf(2, 16, 1024) 158 for i := 0; i < 10; i++ { 159 write(t, b, unsafe.Pointer(&myTags[0]), 1, []uint64{2, 3}, []uintptr{4, 5, 6, 7, 8, 9}) 160 read(t, b, []uint64{10, 1, 2, 3, 4, 5, 6, 7, 8, 9}, []unsafe.Pointer{unsafe.Pointer(&myTags[0])}) 161 read(t, b, nil, nil) // release data returned by previous read 162 } 163 }) 164 165 t.Run("TagWraparound", func(t *testing.T) { 166 b := NewProfBuf(2, 1024, 2) 167 for i := 0; i < 10; i++ { 168 write(t, b, unsafe.Pointer(&myTags[0]), 1, []uint64{2, 3}, []uintptr{4, 5, 6, 7, 8, 9}) 169 read(t, b, []uint64{10, 1, 2, 3, 4, 5, 6, 7, 8, 9}, []unsafe.Pointer{unsafe.Pointer(&myTags[0])}) 170 read(t, b, nil, nil) // release data returned by previous read 171 } 172 }) 173 174 t.Run("BothWraparound", func(t *testing.T) { 175 b := NewProfBuf(2, 16, 2) 176 for i := 0; i < 10; i++ { 177 write(t, b, unsafe.Pointer(&myTags[0]), 1, []uint64{2, 3}, []uintptr{4, 5, 6, 7, 8, 9}) 178 read(t, b, []uint64{10, 1, 2, 3, 4, 5, 6, 7, 8, 9}, []unsafe.Pointer{unsafe.Pointer(&myTags[0])}) 179 read(t, b, nil, nil) // release data returned by previous read 180 } 181 }) 182 } 183
