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Diffstat (limited to 'xpcom/base/nsMemoryInfoDumper.cpp')
| -rw-r--r-- | xpcom/base/nsMemoryInfoDumper.cpp | 742 |
1 files changed, 742 insertions, 0 deletions
diff --git a/xpcom/base/nsMemoryInfoDumper.cpp b/xpcom/base/nsMemoryInfoDumper.cpp new file mode 100644 index 0000000000..28af408178 --- /dev/null +++ b/xpcom/base/nsMemoryInfoDumper.cpp @@ -0,0 +1,742 @@ +/* -*- 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 "mozilla/JSONWriter.h" +#include "mozilla/UniquePtr.h" +#include "mozilla/nsMemoryInfoDumper.h" +#include "mozilla/DebugOnly.h" +#include "nsDumpUtils.h" + +#include "mozilla/Unused.h" +#include "mozilla/dom/ContentParent.h" +#include "mozilla/dom/ContentChild.h" +#include "nsIConsoleService.h" +#include "nsCycleCollector.h" +#include "nsICycleCollectorListener.h" +#include "nsIMemoryReporter.h" +#include "nsDirectoryServiceDefs.h" +#include "nsGZFileWriter.h" +#include "nsJSEnvironment.h" +#include "nsPrintfCString.h" +#include "nsServiceManagerUtils.h" +#include "nsIFile.h" + +#ifdef XP_WIN +# include <process.h> +# ifndef getpid +# define getpid _getpid +# endif +#else +# include <unistd.h> +#endif + +#ifdef XP_UNIX +# define MOZ_SUPPORTS_FIFO 1 +#endif + +// Some Android devices seem to send RT signals to Firefox so we want to avoid +// consuming those as they're not user triggered. +#if !defined(ANDROID) && (defined(XP_LINUX) || defined(__FreeBSD__)) +# define MOZ_SUPPORTS_RT_SIGNALS 1 +#endif + +#if defined(MOZ_SUPPORTS_RT_SIGNALS) +# include <fcntl.h> +# include <sys/types.h> +# include <sys/stat.h> +#endif + +#if defined(MOZ_SUPPORTS_FIFO) +# include "mozilla/Preferences.h" +#endif + +using namespace mozilla; +using namespace mozilla::dom; + +namespace { + +class DumpMemoryInfoToTempDirRunnable : public Runnable { + public: + DumpMemoryInfoToTempDirRunnable(const nsAString& aIdentifier, bool aAnonymize, + bool aMinimizeMemoryUsage) + : mozilla::Runnable("DumpMemoryInfoToTempDirRunnable"), + mIdentifier(aIdentifier), + mAnonymize(aAnonymize), + mMinimizeMemoryUsage(aMinimizeMemoryUsage) {} + + NS_IMETHOD Run() override { + nsCOMPtr<nsIMemoryInfoDumper> dumper = + do_GetService("@mozilla.org/memory-info-dumper;1"); + dumper->DumpMemoryInfoToTempDir(mIdentifier, mAnonymize, + mMinimizeMemoryUsage); + return NS_OK; + } + + private: + const nsString mIdentifier; + const bool mAnonymize; + const bool mMinimizeMemoryUsage; +}; + +class GCAndCCLogDumpRunnable final : public Runnable, + public nsIDumpGCAndCCLogsCallback { + public: + NS_DECL_ISUPPORTS_INHERITED + + GCAndCCLogDumpRunnable(const nsAString& aIdentifier, bool aDumpAllTraces, + bool aDumpChildProcesses) + : mozilla::Runnable("GCAndCCLogDumpRunnable"), + mIdentifier(aIdentifier), + mDumpAllTraces(aDumpAllTraces), + mDumpChildProcesses(aDumpChildProcesses) {} + + NS_IMETHOD Run() override { + nsCOMPtr<nsIMemoryInfoDumper> dumper = + do_GetService("@mozilla.org/memory-info-dumper;1"); + + dumper->DumpGCAndCCLogsToFile(mIdentifier, mDumpAllTraces, + mDumpChildProcesses, this); + return NS_OK; + } + + NS_IMETHOD OnDump(nsIFile* aGCLog, nsIFile* aCCLog, bool aIsParent) override { + return NS_OK; + } + + NS_IMETHOD OnFinish() override { return NS_OK; } + + private: + ~GCAndCCLogDumpRunnable() = default; + + const nsString mIdentifier; + const bool mDumpAllTraces; + const bool mDumpChildProcesses; +}; + +NS_IMPL_ISUPPORTS_INHERITED(GCAndCCLogDumpRunnable, Runnable, + nsIDumpGCAndCCLogsCallback) + +} // namespace + +#if defined(MOZ_SUPPORTS_RT_SIGNALS) // { +namespace { + +/* + * The following code supports dumping about:memory upon receiving a signal. + * + * We listen for the following signals: + * + * - SIGRTMIN: Dump our memory reporters (and those of our child + * processes), + * - SIGRTMIN + 1: Dump our memory reporters (and those of our child + * processes) after minimizing memory usage, and + * - SIGRTMIN + 2: Dump the GC and CC logs in this and our child processes. + * + * When we receive one of these signals, we write the signal number to a pipe. + * The IO thread then notices that the pipe has been written to, and kicks off + * the appropriate task on the main thread. + * + * This scheme is similar to using signalfd(), except it's portable and it + * doesn't require the use of sigprocmask, which is problematic because it + * masks signals received by child processes. + * + * In theory, we could use Chromium's MessageLoopForIO::CatchSignal() for this. + * But that uses libevent, which does not handle the realtime signals (bug + * 794074). + */ + +// It turns out that at least on some systems, SIGRTMIN is not a compile-time +// constant, so these have to be set at runtime. +static uint8_t sDumpAboutMemorySignum; // SIGRTMIN +static uint8_t sDumpAboutMemoryAfterMMUSignum; // SIGRTMIN + 1 +static uint8_t sGCAndCCDumpSignum; // SIGRTMIN + 2 + +void doMemoryReport(const uint8_t aRecvSig) { + // Dump our memory reports (but run this on the main thread!). + bool minimize = aRecvSig == sDumpAboutMemoryAfterMMUSignum; + LOG("SignalWatcher(sig %d) dispatching memory report runnable.", aRecvSig); + RefPtr<DumpMemoryInfoToTempDirRunnable> runnable = + new DumpMemoryInfoToTempDirRunnable(/* identifier = */ u""_ns, + /* anonymize = */ false, minimize); + NS_DispatchToMainThread(runnable); +} + +void doGCCCDump(const uint8_t aRecvSig) { + LOG("SignalWatcher(sig %d) dispatching GC/CC log runnable.", aRecvSig); + // Dump GC and CC logs (from the main thread). + RefPtr<GCAndCCLogDumpRunnable> runnable = + new GCAndCCLogDumpRunnable(/* identifier = */ u""_ns, + /* allTraces = */ true, + /* dumpChildProcesses = */ true); + NS_DispatchToMainThread(runnable); +} + +} // namespace +#endif // MOZ_SUPPORTS_RT_SIGNALS } + +#if defined(MOZ_SUPPORTS_FIFO) // { +namespace { + +void doMemoryReport(const nsCString& aInputStr) { + bool minimize = aInputStr.EqualsLiteral("minimize memory report"); + LOG("FifoWatcher(command:%s) dispatching memory report runnable.", + aInputStr.get()); + RefPtr<DumpMemoryInfoToTempDirRunnable> runnable = + new DumpMemoryInfoToTempDirRunnable(/* identifier = */ u""_ns, + /* anonymize = */ false, minimize); + NS_DispatchToMainThread(runnable); +} + +void doGCCCDump(const nsCString& aInputStr) { + bool doAllTracesGCCCDump = aInputStr.EqualsLiteral("gc log"); + LOG("FifoWatcher(command:%s) dispatching GC/CC log runnable.", + aInputStr.get()); + RefPtr<GCAndCCLogDumpRunnable> runnable = new GCAndCCLogDumpRunnable( + /* identifier = */ u""_ns, doAllTracesGCCCDump, + /* dumpChildProcesses = */ true); + NS_DispatchToMainThread(runnable); +} + +bool SetupFifo() { +# ifdef DEBUG + static bool fifoCallbacksRegistered = false; +# endif + + if (!FifoWatcher::MaybeCreate()) { + return false; + } + + MOZ_ASSERT(!fifoCallbacksRegistered, + "FifoWatcher callbacks should be registered only once"); + + FifoWatcher* fw = FifoWatcher::GetSingleton(); + // Dump our memory reports (but run this on the main thread!). + fw->RegisterCallback("memory report"_ns, doMemoryReport); + fw->RegisterCallback("minimize memory report"_ns, doMemoryReport); + // Dump GC and CC logs (from the main thread). + fw->RegisterCallback("gc log"_ns, doGCCCDump); + fw->RegisterCallback("abbreviated gc log"_ns, doGCCCDump); + +# ifdef DEBUG + fifoCallbacksRegistered = true; +# endif + return true; +} + +void OnFifoEnabledChange(const char* /*unused*/, void* /*unused*/) { + LOG("%s changed", FifoWatcher::kPrefName); + if (SetupFifo()) { + Preferences::UnregisterCallback(OnFifoEnabledChange, + FifoWatcher::kPrefName); + } +} + +} // namespace +#endif // MOZ_SUPPORTS_FIFO } + +NS_IMPL_ISUPPORTS(nsMemoryInfoDumper, nsIMemoryInfoDumper) + +nsMemoryInfoDumper::nsMemoryInfoDumper() = default; + +nsMemoryInfoDumper::~nsMemoryInfoDumper() = default; + +/* static */ +void nsMemoryInfoDumper::Initialize() { +#if defined(MOZ_SUPPORTS_RT_SIGNALS) + SignalPipeWatcher* sw = SignalPipeWatcher::GetSingleton(); + + // Dump memory reporters (and those of our child processes) + sDumpAboutMemorySignum = SIGRTMIN; + sw->RegisterCallback(sDumpAboutMemorySignum, doMemoryReport); + // Dump our memory reporters after minimizing memory usage + sDumpAboutMemoryAfterMMUSignum = SIGRTMIN + 1; + sw->RegisterCallback(sDumpAboutMemoryAfterMMUSignum, doMemoryReport); + // Dump the GC and CC logs in this and our child processes. + sGCAndCCDumpSignum = SIGRTMIN + 2; + sw->RegisterCallback(sGCAndCCDumpSignum, doGCCCDump); +#endif + +#if defined(MOZ_SUPPORTS_FIFO) + if (!SetupFifo()) { + // NB: This gets loaded early enough that it's possible there is a user pref + // set to enable the fifo watcher that has not been loaded yet. Register + // to attempt to initialize if the fifo watcher becomes enabled by + // a user pref. + Preferences::RegisterCallback(OnFifoEnabledChange, FifoWatcher::kPrefName); + } +#endif +} + +static void EnsureNonEmptyIdentifier(nsAString& aIdentifier) { + if (!aIdentifier.IsEmpty()) { + return; + } + + // If the identifier is empty, set it to the number of whole seconds since the + // epoch. This identifier will appear in the files that this process + // generates and also the files generated by this process's children, allowing + // us to identify which files are from the same memory report request. + aIdentifier.AppendInt(static_cast<int64_t>(PR_Now()) / 1000000); +} + +// Use XPCOM refcounting to fire |onFinish| when all reference-holders +// (remote dump actors or the |DumpGCAndCCLogsToFile| activation itself) +// have gone away. +class nsDumpGCAndCCLogsCallbackHolder final + : public nsIDumpGCAndCCLogsCallback { + public: + NS_DECL_ISUPPORTS + + explicit nsDumpGCAndCCLogsCallbackHolder( + nsIDumpGCAndCCLogsCallback* aCallback) + : mCallback(aCallback) {} + + NS_IMETHOD OnFinish() override { return NS_ERROR_UNEXPECTED; } + + NS_IMETHOD OnDump(nsIFile* aGCLog, nsIFile* aCCLog, bool aIsParent) override { + return mCallback->OnDump(aGCLog, aCCLog, aIsParent); + } + + private: + ~nsDumpGCAndCCLogsCallbackHolder() { Unused << mCallback->OnFinish(); } + + nsCOMPtr<nsIDumpGCAndCCLogsCallback> mCallback; +}; + +NS_IMPL_ISUPPORTS(nsDumpGCAndCCLogsCallbackHolder, nsIDumpGCAndCCLogsCallback) + +NS_IMETHODIMP +nsMemoryInfoDumper::DumpGCAndCCLogsToFile( + const nsAString& aIdentifier, bool aDumpAllTraces, bool aDumpChildProcesses, + nsIDumpGCAndCCLogsCallback* aCallback) { + nsString identifier(aIdentifier); + EnsureNonEmptyIdentifier(identifier); + nsCOMPtr<nsIDumpGCAndCCLogsCallback> callbackHolder = + new nsDumpGCAndCCLogsCallbackHolder(aCallback); + + if (aDumpChildProcesses) { + nsTArray<ContentParent*> children; + ContentParent::GetAll(children); + for (uint32_t i = 0; i < children.Length(); i++) { + ContentParent* cp = children[i]; + nsCOMPtr<nsICycleCollectorLogSink> logSink = + nsCycleCollector_createLogSink(); + + logSink->SetFilenameIdentifier(identifier); + logSink->SetProcessIdentifier(cp->Pid()); + + Unused << cp->CycleCollectWithLogs(aDumpAllTraces, logSink, + callbackHolder); + } + } + + nsCOMPtr<nsICycleCollectorListener> logger = nsCycleCollector_createLogger(); + + if (aDumpAllTraces) { + nsCOMPtr<nsICycleCollectorListener> allTracesLogger; + logger->AllTraces(getter_AddRefs(allTracesLogger)); + logger = allTracesLogger; + } + + nsCOMPtr<nsICycleCollectorLogSink> logSink; + logger->GetLogSink(getter_AddRefs(logSink)); + + logSink->SetFilenameIdentifier(identifier); + + nsJSContext::CycleCollectNow(CCReason::DUMP_HEAP, logger); + + nsCOMPtr<nsIFile> gcLog, ccLog; + logSink->GetGcLog(getter_AddRefs(gcLog)); + logSink->GetCcLog(getter_AddRefs(ccLog)); + callbackHolder->OnDump(gcLog, ccLog, /* parent = */ true); + + return NS_OK; +} + +NS_IMETHODIMP +nsMemoryInfoDumper::DumpGCAndCCLogsToSink(bool aDumpAllTraces, + nsICycleCollectorLogSink* aSink) { + nsCOMPtr<nsICycleCollectorListener> logger = nsCycleCollector_createLogger(); + + if (aDumpAllTraces) { + nsCOMPtr<nsICycleCollectorListener> allTracesLogger; + logger->AllTraces(getter_AddRefs(allTracesLogger)); + logger = allTracesLogger; + } + + logger->SetLogSink(aSink); + + nsJSContext::CycleCollectNow(CCReason::DUMP_HEAP, logger); + + return NS_OK; +} + +static void MakeFilename(const char* aPrefix, const nsAString& aIdentifier, + int aPid, const char* aSuffix, nsACString& aResult) { + aResult = + nsPrintfCString("%s-%s-%d.%s", aPrefix, + NS_ConvertUTF16toUTF8(aIdentifier).get(), aPid, aSuffix); +} + +// This class wraps GZFileWriter so it can be used with JSONWriter, overcoming +// the following two problems: +// - It provides a JSONWriterFunc::Write() that calls nsGZFileWriter::Write(). +// - It can be stored as a UniquePtr, whereas nsGZFileWriter is refcounted. +class GZWriterWrapper final : public JSONWriteFunc { + public: + explicit GZWriterWrapper(nsGZFileWriter* aGZWriter) : mGZWriter(aGZWriter) {} + + void Write(const Span<const char>& aStr) final { + // Ignore any failure because JSONWriteFunc doesn't have a mechanism for + // handling errors. + Unused << mGZWriter->Write(aStr.data(), aStr.size()); + } + + nsresult Finish() { return mGZWriter->Finish(); } + + private: + RefPtr<nsGZFileWriter> mGZWriter; +}; + +// We need two callbacks: one that handles reports, and one that is called at +// the end of reporting. Both the callbacks need access to the same JSONWriter, +// so we implement both of them in this one class. +class HandleReportAndFinishReportingCallbacks final + : public nsIHandleReportCallback, + public nsIFinishReportingCallback { + public: + NS_DECL_ISUPPORTS + + HandleReportAndFinishReportingCallbacks( + UniquePtr<JSONWriter> aWriter, nsIFinishDumpingCallback* aFinishDumping, + nsISupports* aFinishDumpingData) + : mWriter(std::move(aWriter)), + mFinishDumping(aFinishDumping), + mFinishDumpingData(aFinishDumpingData) {} + + // This is the callback for nsIHandleReportCallback. + NS_IMETHOD Callback(const nsACString& aProcess, const nsACString& aPath, + int32_t aKind, int32_t aUnits, int64_t aAmount, + const nsACString& aDescription, + nsISupports* aData) override { + nsAutoCString process; + if (aProcess.IsEmpty()) { + // If the process is empty, the report originated with the process doing + // the dumping. In that case, generate the process identifier, which is + // of the form "$PROCESS_NAME (pid $PID)", or just "(pid $PID)" if we + // don't have a process name. If we're the main process, we let + // $PROCESS_NAME be "Main Process". + // + // `appendAboutMemoryMain()` in aboutMemory.js does much the same thing + // for live memory reports. + if (XRE_IsParentProcess()) { + // We're the main process. + process.AssignLiteral("Main Process"); + } else if (ContentChild* cc = ContentChild::GetSingleton()) { + // Try to get the process name from ContentChild. + cc->GetProcessName(process); + } + ContentChild::AppendProcessId(process); + + } else { + // Otherwise, the report originated with another process and already has a + // process name. Just use that. + process = aProcess; + } + + mWriter->StartObjectElement(); + { + mWriter->StringProperty("process", process); + mWriter->StringProperty("path", PromiseFlatCString(aPath)); + mWriter->IntProperty("kind", aKind); + mWriter->IntProperty("units", aUnits); + mWriter->IntProperty("amount", aAmount); + mWriter->StringProperty("description", PromiseFlatCString(aDescription)); + } + mWriter->EndObject(); + + return NS_OK; + } + + // This is the callback for nsIFinishReportingCallback. + NS_IMETHOD Callback(nsISupports* aData) override { + mWriter->EndArray(); // end of "reports" array + mWriter->End(); + + // The call to Finish() deallocates the memory allocated by the first Write + // call. Because that memory was live while the memory reporters ran and + // was measured by them -- by "heap-allocated" if nothing else -- we want + // DMD to see it as well. So we deliberately don't call Finish() until + // after DMD finishes. + nsresult rv = static_cast<GZWriterWrapper&>(mWriter->WriteFunc()).Finish(); + NS_ENSURE_SUCCESS(rv, rv); + + if (!mFinishDumping) { + return NS_OK; + } + + return mFinishDumping->Callback(mFinishDumpingData); + } + + private: + ~HandleReportAndFinishReportingCallbacks() = default; + + UniquePtr<JSONWriter> mWriter; + nsCOMPtr<nsIFinishDumpingCallback> mFinishDumping; + nsCOMPtr<nsISupports> mFinishDumpingData; +}; + +NS_IMPL_ISUPPORTS(HandleReportAndFinishReportingCallbacks, + nsIHandleReportCallback, nsIFinishReportingCallback) + +class TempDirFinishCallback final : public nsIFinishDumpingCallback { + public: + NS_DECL_ISUPPORTS + + TempDirFinishCallback(nsIFile* aReportsTmpFile, + const nsCString& aReportsFinalFilename) + : mReportsTmpFile(aReportsTmpFile), + mReportsFilename(aReportsFinalFilename) {} + + NS_IMETHOD Callback(nsISupports* aData) override { + // Rename the memory reports file, now that we're done writing all the + // files. Its final name is "memory-report<-identifier>-<pid>.json.gz". + + nsCOMPtr<nsIFile> reportsFinalFile; + nsresult rv = NS_GetSpecialDirectory(NS_OS_TEMP_DIR, + getter_AddRefs(reportsFinalFile)); + if (NS_WARN_IF(NS_FAILED(rv))) { + return rv; + } + +#ifdef ANDROID + rv = reportsFinalFile->AppendNative("memory-reports"_ns); + if (NS_WARN_IF(NS_FAILED(rv))) { + return rv; + } +#endif + + rv = reportsFinalFile->AppendNative(mReportsFilename); + if (NS_WARN_IF(NS_FAILED(rv))) { + return rv; + } + + rv = reportsFinalFile->CreateUnique(nsIFile::NORMAL_FILE_TYPE, 0600); + if (NS_WARN_IF(NS_FAILED(rv))) { + return rv; + } + + nsAutoString reportsFinalFilename; + rv = reportsFinalFile->GetLeafName(reportsFinalFilename); + if (NS_WARN_IF(NS_FAILED(rv))) { + return rv; + } + + rv = mReportsTmpFile->MoveTo(/* directory */ nullptr, reportsFinalFilename); + if (NS_WARN_IF(NS_FAILED(rv))) { + return rv; + } + + // Write a message to the console. + + nsCOMPtr<nsIConsoleService> cs = + do_GetService(NS_CONSOLESERVICE_CONTRACTID, &rv); + if (NS_WARN_IF(NS_FAILED(rv))) { + return rv; + } + + nsString path; + mReportsTmpFile->GetPath(path); + if (NS_WARN_IF(NS_FAILED(rv))) { + return rv; + } + + nsString msg = u"nsIMemoryInfoDumper dumped reports to "_ns; + msg.Append(path); + return cs->LogStringMessage(msg.get()); + } + + private: + ~TempDirFinishCallback() = default; + + nsCOMPtr<nsIFile> mReportsTmpFile; + nsCString mReportsFilename; +}; + +NS_IMPL_ISUPPORTS(TempDirFinishCallback, nsIFinishDumpingCallback) + +static nsresult DumpMemoryInfoToFile(nsIFile* aReportsFile, + nsIFinishDumpingCallback* aFinishDumping, + nsISupports* aFinishDumpingData, + bool aAnonymize, bool aMinimizeMemoryUsage, + nsAString& aDMDIdentifier) { + RefPtr<nsGZFileWriter> gzWriter = new nsGZFileWriter(); + nsresult rv = gzWriter->Init(aReportsFile); + if (NS_WARN_IF(NS_FAILED(rv))) { + return rv; + } + auto jsonWriter = + MakeUnique<JSONWriter>(MakeUnique<GZWriterWrapper>(gzWriter)); + + nsCOMPtr<nsIMemoryReporterManager> mgr = + do_GetService("@mozilla.org/memory-reporter-manager;1"); + + // This is the first write to the file, and it causes |aWriter| to allocate + // over 200 KiB of memory. + jsonWriter->Start(); + { + // Increment this number if the format changes. + jsonWriter->IntProperty("version", 1); + jsonWriter->BoolProperty("hasMozMallocUsableSize", + mgr->GetHasMozMallocUsableSize()); + jsonWriter->StartArrayProperty("reports"); + } + + RefPtr<HandleReportAndFinishReportingCallbacks> + handleReportAndFinishReporting = + new HandleReportAndFinishReportingCallbacks( + std::move(jsonWriter), aFinishDumping, aFinishDumpingData); + rv = mgr->GetReportsExtended( + handleReportAndFinishReporting, nullptr, handleReportAndFinishReporting, + nullptr, aAnonymize, aMinimizeMemoryUsage, aDMDIdentifier); + return rv; +} + +NS_IMETHODIMP +nsMemoryInfoDumper::DumpMemoryReportsToNamedFile( + const nsAString& aFilename, nsIFinishDumpingCallback* aFinishDumping, + nsISupports* aFinishDumpingData, bool aAnonymize, + bool aMinimizeMemoryUsage) { + MOZ_ASSERT(!aFilename.IsEmpty()); + + // Create the file. + + nsCOMPtr<nsIFile> reportsFile; + nsresult rv = NS_NewLocalFile(aFilename, false, getter_AddRefs(reportsFile)); + if (NS_WARN_IF(NS_FAILED(rv))) { + return rv; + } + + reportsFile->InitWithPath(aFilename); + if (NS_WARN_IF(NS_FAILED(rv))) { + return rv; + } + + bool exists; + rv = reportsFile->Exists(&exists); + if (NS_WARN_IF(NS_FAILED(rv))) { + return rv; + } + + if (!exists) { + rv = reportsFile->Create(nsIFile::NORMAL_FILE_TYPE, 0644); + if (NS_WARN_IF(NS_FAILED(rv))) { + return rv; + } + } + + nsString dmdIdent; + return DumpMemoryInfoToFile(reportsFile, aFinishDumping, aFinishDumpingData, + aAnonymize, aMinimizeMemoryUsage, dmdIdent); +} + +NS_IMETHODIMP +nsMemoryInfoDumper::DumpMemoryInfoToTempDir(const nsAString& aIdentifier, + bool aAnonymize, + bool aMinimizeMemoryUsage) { + nsString identifier(aIdentifier); + EnsureNonEmptyIdentifier(identifier); + + // Open a new file named something like + // + // incomplete-memory-report-<identifier>-<pid>.json.gz + // + // in NS_OS_TEMP_DIR for writing. When we're finished writing the report, + // we'll rename this file and get rid of the "incomplete-" prefix. + // + // We do this because we don't want scripts which poll the filesystem + // looking for memory report dumps to grab a file before we're finished + // writing to it. + + // The "unified" indicates that we merge the memory reports from all + // processes and write out one file, rather than a separate file for + // each process as was the case before bug 946407. This is so that + // the get_about_memory.py script in the B2G repository can + // determine when it's done waiting for files to appear. + nsCString reportsFinalFilename; + MakeFilename("unified-memory-report", identifier, getpid(), "json.gz", + reportsFinalFilename); + + nsCOMPtr<nsIFile> reportsTmpFile; + nsresult rv; + // In Android case, this function will open a file named aFilename under + // specific folder (/data/local/tmp/memory-reports). Otherwise, it will + // open a file named aFilename under "NS_OS_TEMP_DIR". + rv = nsDumpUtils::OpenTempFile("incomplete-"_ns + reportsFinalFilename, + getter_AddRefs(reportsTmpFile), + "memory-reports"_ns); + if (NS_WARN_IF(NS_FAILED(rv))) { + return rv; + } + + RefPtr<TempDirFinishCallback> finishDumping = + new TempDirFinishCallback(reportsTmpFile, reportsFinalFilename); + + return DumpMemoryInfoToFile(reportsTmpFile, finishDumping, nullptr, + aAnonymize, aMinimizeMemoryUsage, identifier); +} + +#ifdef MOZ_DMD +dmd::DMDFuncs::Singleton dmd::DMDFuncs::sSingleton; + +nsresult nsMemoryInfoDumper::OpenDMDFile(const nsAString& aIdentifier, int aPid, + FILE** aOutFile) { + if (!dmd::IsRunning()) { + *aOutFile = nullptr; + return NS_OK; + } + + // Create a filename like dmd-<identifier>-<pid>.json.gz, which will be used + // if DMD is enabled. + nsCString dmdFilename; + MakeFilename("dmd", aIdentifier, aPid, "json.gz", dmdFilename); + + // Open a new DMD file named |dmdFilename| in NS_OS_TEMP_DIR for writing, + // and dump DMD output to it. This must occur after the memory reporters + // have been run (above), but before the memory-reports file has been + // renamed (so scripts can detect the DMD file, if present). + + nsresult rv; + nsCOMPtr<nsIFile> dmdFile; + rv = nsDumpUtils::OpenTempFile(dmdFilename, getter_AddRefs(dmdFile), + "memory-reports"_ns); + if (NS_WARN_IF(NS_FAILED(rv))) { + return rv; + } + rv = dmdFile->OpenANSIFileDesc("wb", aOutFile); + NS_WARNING_ASSERTION(NS_SUCCEEDED(rv), "OpenANSIFileDesc failed"); + + // Print the path, because on some platforms (e.g. Mac) it's not obvious. + dmd::StatusMsg("opened %s for writing\n", dmdFile->HumanReadablePath().get()); + + return rv; +} + +nsresult nsMemoryInfoDumper::DumpDMDToFile(FILE* aFile) { + RefPtr<nsGZFileWriter> gzWriter = new nsGZFileWriter(); + nsresult rv = gzWriter->InitANSIFileDesc(aFile); + if (NS_WARN_IF(NS_FAILED(rv))) { + return rv; + } + + // Dump DMD's memory reports analysis to the file. + dmd::Analyze(MakeUnique<GZWriterWrapper>(gzWriter)); + + rv = gzWriter->Finish(); + NS_WARNING_ASSERTION(NS_SUCCEEDED(rv), "Finish failed"); + return rv; +} +#endif // MOZ_DMD |