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// Copyright 2023 The Go Authors. All rights reserved. // Use of this source code is governed by a BSD-style // license that can be found in the LICENSE file. //go:build goexperiment.exectracer2 // Trace buffer management. package runtime import ( "runtime/internal/sys" "unsafe" ) // Maximum number of bytes required to encode uint64 in base-128. const traceBytesPerNumber = 10 // traceWriter is the interface for writing all trace data. // // This type is passed around as a value, and all of its methods return // a new traceWriter. This allows for chaining together calls in a fluent-style // API. This is partly stylistic, and very slightly for performance, since // the compiler can destructure this value and pass it between calls as // just regular arguments. However, this style is not load-bearing, and // we can change it if it's deemed too error-prone. type traceWriter struct { traceLocker *traceBuf } // write returns an a traceWriter that writes into the current M's stream. func (tl traceLocker) writer() traceWriter { return traceWriter{traceLocker: tl, traceBuf: tl.mp.trace.buf[tl.gen%2]} } // unsafeTraceWriter produces a traceWriter that doesn't lock the trace. // // It should only be used in contexts where either: // - Another traceLocker is held. // - trace.gen is prevented from advancing. // // buf may be nil. func unsafeTraceWriter(gen uintptr, buf *traceBuf) traceWriter { return traceWriter{traceLocker: traceLocker{gen: gen}, traceBuf: buf} } // end writes the buffer back into the m. func (w traceWriter) end() { if w.mp == nil { // Tolerate a nil mp. It makes code that creates traceWriters directly // less error-prone. return } w.mp.trace.buf[w.gen%2] = w.traceBuf } // ensure makes sure that at least maxSize bytes are available to write. // // Returns whether the buffer was flushed. func (w traceWriter) ensure(maxSize int) (traceWriter, bool) { refill := w.traceBuf == nil || !w.available(maxSize) if refill { w = w.refill() } return w, refill } // flush puts w.traceBuf on the queue of full buffers. func (w traceWriter) flush() traceWriter { systemstack(func() { lock(&trace.lock) if w.traceBuf != nil { traceBufFlush(w.traceBuf, w.gen) } unlock(&trace.lock) }) w.traceBuf = nil return w } // refill puts w.traceBuf on the queue of full buffers and refresh's w's buffer. func (w traceWriter) refill() traceWriter { systemstack(func() { lock(&trace.lock) if w.traceBuf != nil { traceBufFlush(w.traceBuf, w.gen) } if trace.empty != nil { w.traceBuf = trace.empty trace.empty = w.traceBuf.link unlock(&trace.lock) } else { unlock(&trace.lock) w.traceBuf = (*traceBuf)(sysAlloc(unsafe.Sizeof(traceBuf{}), &memstats.other_sys)) if w.traceBuf == nil { throw("trace: out of memory") } } }) // Initialize the buffer. ts := traceClockNow() if ts <= w.traceBuf.lastTime { ts = w.traceBuf.lastTime + 1 } w.traceBuf.lastTime = ts w.traceBuf.link = nil w.traceBuf.pos = 0 // Tolerate a nil mp. mID := ^uint64(0) if w.mp != nil { mID = uint64(w.mp.procid) } // Write the buffer's header. w.byte(byte(traceEvEventBatch)) w.varint(uint64(w.gen)) w.varint(uint64(mID)) w.varint(uint64(ts)) w.traceBuf.lenPos = w.varintReserve() return w } // traceBufQueue is a FIFO of traceBufs. type traceBufQueue struct { head, tail *traceBuf } // push queues buf into queue of buffers. func (q *traceBufQueue) push(buf *traceBuf) { buf.link = nil if q.head == nil { q.head = buf } else { q.tail.link = buf } q.tail = buf } // pop dequeues from the queue of buffers. func (q *traceBufQueue) pop() *traceBuf { buf := q.head if buf == nil { return nil } q.head = buf.link if q.head == nil { q.tail = nil } buf.link = nil return buf } func (q *traceBufQueue) empty() bool { return q.head == nil } // traceBufHeader is per-P tracing buffer. type traceBufHeader struct { link *traceBuf // in trace.empty/full lastTime traceTime // when we wrote the last event pos int // next write offset in arr lenPos int // position of batch length value } // traceBuf is per-M tracing buffer. // // TODO(mknyszek): Rename traceBuf to traceBatch, since they map 1:1 with event batches. type traceBuf struct { _ sys.NotInHeap traceBufHeader arr [64<<10 - unsafe.Sizeof(traceBufHeader{})]byte // underlying buffer for traceBufHeader.buf } // byte appends v to buf. func (buf *traceBuf) byte(v byte) { buf.arr[buf.pos] = v buf.pos++ } // varint appends v to buf in little-endian-base-128 encoding. func (buf *traceBuf) varint(v uint64) { pos := buf.pos arr := buf.arr[pos : pos+traceBytesPerNumber] for i := range arr { if v < 0x80 { pos += i + 1 arr[i] = byte(v) break } arr[i] = 0x80 | byte(v) v >>= 7 } buf.pos = pos } // varintReserve reserves enough space in buf to hold any varint. // // Space reserved this way can be filled in with the varintAt method. func (buf *traceBuf) varintReserve() int { p := buf.pos buf.pos += traceBytesPerNumber return p } // stringData appends s's data directly to buf. func (buf *traceBuf) stringData(s string) { buf.pos += copy(buf.arr[buf.pos:], s) } func (buf *traceBuf) available(size int) bool { return len(buf.arr)-buf.pos >= size } // varintAt writes varint v at byte position pos in buf. This always // consumes traceBytesPerNumber bytes. This is intended for when the caller // needs to reserve space for a varint but can't populate it until later. // Use varintReserve to reserve this space. func (buf *traceBuf) varintAt(pos int, v uint64) { for i := 0; i < traceBytesPerNumber; i++ { if i < traceBytesPerNumber-1 { buf.arr[pos] = 0x80 | byte(v) } else { buf.arr[pos] = byte(v) } v >>= 7 pos++ } if v != 0 { throw("v could not fit in traceBytesPerNumber") } } // traceBufFlush flushes a trace buffer. // // Must run on the system stack because trace.lock must be held. // //go:systemstack func traceBufFlush(buf *traceBuf, gen uintptr) { assertLockHeld(&trace.lock) // Write out the non-header length of the batch in the header. // // Note: the length of the header is not included to make it easier // to calculate this value when deserializing and reserializing the // trace. Varints can have additional padding of zero bits that is // quite difficult to preserve, and if we include the header we // force serializers to do more work. Nothing else actually needs // padding. buf.varintAt(buf.lenPos, uint64(buf.pos-(buf.lenPos+traceBytesPerNumber))) trace.full[gen%2].push(buf) // Notify the scheduler that there's work available and that the trace // reader should be scheduled. if !trace.workAvailable.Load() { trace.workAvailable.Store(true) } }