mirror of
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f9a6a5bdd2
TEST=build Change-Id: I2834ef7cf7cb7c8770f8167a2438cbedcee5c623 Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/292063 Commit-Queue: Ryan Macnak <rmacnak@google.com> Reviewed-by: Alexander Aprelev <aam@google.com>
120 lines
3.6 KiB
C++
120 lines
3.6 KiB
C++
// Copyright (c) 2017, the Dart project authors. Please see the AUTHORS file
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// for details. All rights reserved. Use of this source code is governed by a
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// BSD-style license that can be found in the LICENSE file.
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#include "vm/globals.h"
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#if defined(DART_HOST_OS_ANDROID) && defined(SUPPORT_TIMELINE)
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#include <errno.h>
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#include <fcntl.h>
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#include <cstdlib>
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#include "platform/atomic.h"
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#include "platform/signal_blocker.h"
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#include "vm/isolate.h"
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#include "vm/json_stream.h"
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#include "vm/lockers.h"
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#include "vm/log.h"
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#include "vm/object.h"
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#include "vm/service_event.h"
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#include "vm/thread.h"
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#include "vm/timeline.h"
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namespace dart {
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DECLARE_FLAG(bool, trace_timeline);
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static int OpenTraceFD() {
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const char* kSystraceDebugPath = "/sys/kernel/debug/tracing/trace_marker";
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const char* kSystracePath = "/sys/kernel/tracing/trace_marker";
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int fd = TEMP_FAILURE_RETRY(::open(kSystracePath, O_WRONLY));
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if (fd < 0) {
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fd = TEMP_FAILURE_RETRY(::open(kSystraceDebugPath, O_WRONLY));
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}
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if (fd < 0 && FLAG_trace_timeline) {
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OS::PrintErr("TimelineEventSystraceRecorder: Could not open `%s` or `%s`\n",
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kSystraceDebugPath, kSystracePath);
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}
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return fd;
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}
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TimelineEventSystraceRecorder::TimelineEventSystraceRecorder()
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: TimelineEventPlatformRecorder(), systrace_fd_(OpenTraceFD()) {
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Timeline::set_recorder_discards_clock_values(true);
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}
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TimelineEventSystraceRecorder::~TimelineEventSystraceRecorder() {
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if (systrace_fd_ >= 0) {
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close(systrace_fd_);
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}
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}
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intptr_t TimelineEventSystraceRecorder::PrintSystrace(TimelineEvent* event,
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char* buffer,
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intptr_t buffer_size) {
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ASSERT(buffer != nullptr);
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ASSERT(buffer_size > 0);
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buffer[0] = '\0';
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intptr_t length = 0;
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int64_t pid = OS::ProcessId();
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switch (event->event_type()) {
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case TimelineEvent::kBegin: {
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length = Utils::SNPrint(buffer, buffer_size, "B|%" Pd64 "|%s", pid,
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event->label());
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break;
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}
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case TimelineEvent::kEnd: {
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length = Utils::SNPrint(buffer, buffer_size, "E");
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break;
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}
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case TimelineEvent::kCounter: {
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if (event->arguments_length() > 0) {
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// We only report the first counter value.
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length = Utils::SNPrint(buffer, buffer_size, "C|%" Pd64 "|%s|%s", pid,
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event->label(), event->arguments()[0].value);
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}
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break;
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}
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case TimelineEvent::kAsyncBegin: {
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length = Utils::SNPrint(buffer, buffer_size, "S|%" Pd64 "|%s|%" Pd64 "",
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pid, event->label(), event->Id());
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break;
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}
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case TimelineEvent::kAsyncEnd: {
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length = Utils::SNPrint(buffer, buffer_size, "F|%" Pd64 "|%s|%" Pd64 "",
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pid, event->label(), event->Id());
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break;
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}
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default:
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// Ignore event types that we cannot serialize to the Systrace format.
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break;
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}
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return length;
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}
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void TimelineEventSystraceRecorder::OnEvent(TimelineEvent* event) {
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if (event == nullptr) {
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return;
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}
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if (systrace_fd_ < 0) {
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return;
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}
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// Serialize to the systrace format.
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const intptr_t kBufferLength = 1024;
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char buffer[kBufferLength];
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const intptr_t event_length = PrintSystrace(event, &buffer[0], kBufferLength);
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if (event_length > 0) {
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ssize_t result;
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// Repeatedly attempt the write while we are being interrupted.
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do {
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result = write(systrace_fd_, buffer, event_length);
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} while ((result == -1L) && (errno == EINTR));
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}
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}
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} // namespace dart
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#endif // defined(DART_HOST_OS_ANDROID) && !defined(PRODUCT)
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