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/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* vim: set ts=8 sts=2 et sw=2 tw=80: */
/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
#include "MainThreadIOLogger.h"
#include "GeckoProfiler.h"
#include "IOInterposerPrivate.h"
#include "mozilla/IOInterposer.h"
#include "mozilla/StaticPtr.h"
#include "mozilla/TimeStamp.h"
#include "mozilla/UniquePtr.h"
#include "nsNativeCharsetUtils.h"
#include "nsThreadUtils.h"
/**
* This code uses NSPR stuff and STL containers because it must be detached
* from leak checking code; this observer runs until the process terminates.
*/
#include <prenv.h>
#include <prprf.h>
#include <prthread.h>
#include <vector>
namespace {
struct ObservationWithStack {
explicit ObservationWithStack(mozilla::IOInterposeObserver::Observation& aObs,
ProfilerBacktrace* aStack)
: mObservation(aObs), mStack(aStack) {
aObs.Filename(mFilename);
}
mozilla::IOInterposeObserver::Observation mObservation;
ProfilerBacktrace* mStack;
nsString mFilename;
};
class MainThreadIOLoggerImpl final : public mozilla::IOInterposeObserver {
public:
MainThreadIOLoggerImpl();
~MainThreadIOLoggerImpl();
bool Init();
void Observe(Observation& aObservation) override;
private:
static void sIOThreadFunc(void* aArg);
void IOThreadFunc();
mozilla::TimeStamp mLogStartTime;
const char* mFileName;
PRThread* mIOThread;
mozilla::IOInterposer::Monitor mMonitor;
bool mShutdownRequired MOZ_GUARDED_BY(mMonitor);
std::vector<ObservationWithStack> mObservations MOZ_GUARDED_BY(mMonitor);
};
static mozilla::StaticAutoPtr<MainThreadIOLoggerImpl> sImpl;
MainThreadIOLoggerImpl::MainThreadIOLoggerImpl()
: mFileName(nullptr), mIOThread(nullptr), mShutdownRequired(false) {}
MainThreadIOLoggerImpl::~MainThreadIOLoggerImpl() {
if (!mIOThread) {
return;
}
{
// Scope for lock
mozilla::IOInterposer::MonitorAutoLock lock(mMonitor);
mShutdownRequired = true;
mMonitor.Notify();
}
PR_JoinThread(mIOThread);
mIOThread = nullptr;
}
bool MainThreadIOLoggerImpl::Init() {
if (mFileName) {
// Already initialized
return true;
}
mFileName = PR_GetEnv("MOZ_MAIN_THREAD_IO_LOG");
if (!mFileName) {
// Can't start
return false;
}
mIOThread =
PR_CreateThread(PR_USER_THREAD, &sIOThreadFunc, this, PR_PRIORITY_LOW,
PR_GLOBAL_THREAD, PR_JOINABLE_THREAD, 0);
if (!mIOThread) {
return false;
}
return true;
}
/* static */
void MainThreadIOLoggerImpl::sIOThreadFunc(void* aArg) {
AUTO_PROFILER_REGISTER_THREAD("MainThreadIOLogger");
NS_SetCurrentThreadName("MainThreadIOLogger");
MainThreadIOLoggerImpl* obj = static_cast<MainThreadIOLoggerImpl*>(aArg);
obj->IOThreadFunc();
}
void MainThreadIOLoggerImpl::IOThreadFunc() {
PRFileDesc* fd = PR_Open(mFileName, PR_WRONLY | PR_CREATE_FILE | PR_TRUNCATE,
PR_IRUSR | PR_IWUSR | PR_IRGRP);
if (!fd) {
mozilla::IOInterposer::MonitorAutoLock lock(mMonitor);
mShutdownRequired = true;
std::vector<ObservationWithStack>().swap(mObservations);
return;
}
mLogStartTime = mozilla::TimeStamp::Now();
{
// Scope for lock
mozilla::IOInterposer::MonitorAutoLock lock(mMonitor);
while (true) {
while (!mShutdownRequired && mObservations.empty()) {
mMonitor.Wait();
}
if (mShutdownRequired) {
break;
}
// Pull events off the shared array onto a local one
std::vector<ObservationWithStack> observationsToWrite;
observationsToWrite.swap(mObservations);
// Release the lock so that we're not holding anybody up during I/O
mozilla::IOInterposer::MonitorAutoUnlock unlock(mMonitor);
// Now write the events.
for (auto i = observationsToWrite.begin(), e = observationsToWrite.end();
i != e; ++i) {
if (i->mObservation.ObservedOperation() == OpNextStage) {
PR_fprintf(
fd, "%f,NEXT-STAGE\n",
(mozilla::TimeStamp::Now() - mLogStartTime).ToMilliseconds());
continue;
}
double durationMs = i->mObservation.Duration().ToMilliseconds();
nsAutoCString nativeFilename;
nativeFilename.AssignLiteral("(not available)");
if (!i->mFilename.IsEmpty()) {
if (NS_FAILED(NS_CopyUnicodeToNative(i->mFilename, nativeFilename))) {
nativeFilename.AssignLiteral("(conversion failed)");
}
}
// clang-format off
/**
* Format:
* Start Timestamp (Milliseconds), Operation, Duration (Milliseconds), Event Source, Filename
*/
// clang-format on
if (PR_fprintf(
fd, "%f,%s,%f,%s,%s\n",
(i->mObservation.Start() - mLogStartTime).ToMilliseconds(),
i->mObservation.ObservedOperationString(), durationMs,
i->mObservation.Reference(), nativeFilename.get()) > 0) {
// TODO: Write out the callstack
i->mStack = nullptr;
}
}
}
}
PR_Close(fd);
}
void MainThreadIOLoggerImpl::Observe(Observation& aObservation) {
if (!mFileName || !IsMainThread()) {
return;
}
mozilla::IOInterposer::MonitorAutoLock lock(mMonitor);
if (mShutdownRequired) {
// The writer thread isn't running. Don't enqueue any more data.
return;
}
// Passing nullptr as aStack parameter for now
mObservations.push_back(ObservationWithStack(aObservation, nullptr));
mMonitor.Notify();
}
} // namespace
namespace mozilla {
namespace MainThreadIOLogger {
bool Init() {
auto impl = MakeUnique<MainThreadIOLoggerImpl>();
if (!impl->Init()) {
return false;
}
sImpl = impl.release();
IOInterposer::Register(IOInterposeObserver::OpAllWithStaging, sImpl);
return true;
}
} // namespace MainThreadIOLogger
} // namespace mozilla
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