зеркало из https://github.com/mozilla/gecko-dev.git
Bug 1649056 - Pre-record some meta information before locking the profiler mutex - r=canaltinova
Some profile meta information can be gathered before the profiler mutex must be locked. This reduces the main-thread locking when capturing. Most importantly, it prevents deadlocking in case any of the data-gathering operation would itself rely on profiler-locking functions (e.g., starting a thread, which requires the lock to register the new thread with the profiler). Differential Revision: https://phabricator.services.mozilla.com/D81491
This commit is contained in:
Gerald Squelart
Родитель
3de598d4a7
Коммит
c1fe2ae51c
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@ -2318,9 +2318,86 @@ static void StreamCategories(SpliceableJSONWriter& aWriter) {
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#undef CATEGORY_JSON_END_CATEGORY
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}
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static void StreamMetaJSCustomObject(PSLockRef aLock,
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SpliceableJSONWriter& aWriter,
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bool aIsShuttingDown) {
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// Some meta information that is better recorded before streaming the profile.
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// This is *not* intended to be cached, as some values could change between
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// profiling sessions.
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struct PreRecordedMetaInformation {
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bool mAsyncStacks;
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// This struct should only live on the stack, so it's fine to use Auto
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// strings.
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nsAutoCString mHttpPlatform;
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nsAutoCString mHttpOscpu;
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nsAutoCString mHttpMisc;
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nsAutoCString mRuntimeABI;
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nsAutoCString mRuntimeToolkit;
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nsAutoCString mAppInfoProduct;
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nsAutoCString mAppInfoAppBuildID;
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nsAutoCString mAppInfoSourceURL;
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int32_t mProcessInfoCpuCount;
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int32_t mProcessInfoCpuCores;
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};
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// This function should be called out of the profiler lock.
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// It gathers non-trivial data that doesn't require the profiler to stop, or for
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// which the request could theoretically deadlock if the profiler is locked.
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static PreRecordedMetaInformation PreRecordMetaInformation() {
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gPSMutex.AssertCurrentThreadDoesNotOwn();
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PreRecordedMetaInformation info = {}; // Aggregate-init all fields.
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if (!NS_IsMainThread()) {
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// Leave these properties out if we're not on the main thread.
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// At the moment, the only case in which this function is called on a
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// background thread is if we're in a content process and are going to
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// send this profile to the parent process. In that case, the parent
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// process profile's "meta" object already has the rest of the properties,
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// and the parent process profile is dumped on that process's main thread.
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return info;
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}
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info.mAsyncStacks = Preferences::GetBool("javascript.options.asyncstack");
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nsresult res;
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if (nsCOMPtr<nsIHttpProtocolHandler> http =
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do_GetService(NS_NETWORK_PROTOCOL_CONTRACTID_PREFIX "http", &res);
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!NS_FAILED(res) && http) {
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Unused << http->GetPlatform(info.mHttpPlatform);
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Unused << http->GetOscpu(info.mHttpOscpu);
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Unused << http->GetMisc(info.mHttpMisc);
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}
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if (nsCOMPtr<nsIXULRuntime> runtime =
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do_GetService("@mozilla.org/xre/runtime;1");
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runtime) {
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Unused << runtime->GetXPCOMABI(info.mRuntimeABI);
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Unused << runtime->GetWidgetToolkit(info.mRuntimeToolkit);
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}
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if (nsCOMPtr<nsIXULAppInfo> appInfo =
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do_GetService("@mozilla.org/xre/app-info;1");
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appInfo) {
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Unused << appInfo->GetName(info.mAppInfoProduct);
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Unused << appInfo->GetAppBuildID(info.mAppInfoAppBuildID);
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Unused << appInfo->GetSourceURL(info.mAppInfoSourceURL);
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}
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ProcessInfo processInfo = {}; // Aggregate-init all fields to false/zeroes.
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if (NS_SUCCEEDED(CollectProcessInfo(processInfo))) {
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info.mProcessInfoCpuCount = processInfo.cpuCount;
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info.mProcessInfoCpuCores = processInfo.cpuCores;
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}
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return info;
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}
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static void StreamMetaJSCustomObject(
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PSLockRef aLock, SpliceableJSONWriter& aWriter, bool aIsShuttingDown,
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const PreRecordedMetaInformation& aPreRecordedMetaInformation) {
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MOZ_RELEASE_ASSERT(CorePS::Exists() && ActivePS::Exists(aLock));
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aWriter.IntProperty("version", 19);
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@ -2369,72 +2446,54 @@ static void StreamMetaJSCustomObject(PSLockRef aLock,
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aWriter.IntProperty("gcpoison", JS::IsGCPoisoning() ? 1 : 0);
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bool asyncStacks = Preferences::GetBool("javascript.options.asyncstack");
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aWriter.IntProperty("asyncstack", asyncStacks);
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aWriter.IntProperty("asyncstack", aPreRecordedMetaInformation.mAsyncStacks);
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aWriter.IntProperty("processType", XRE_GetProcessType());
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aWriter.StringProperty("updateChannel", MOZ_STRINGIFY(MOZ_UPDATE_CHANNEL));
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nsresult res;
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nsCOMPtr<nsIHttpProtocolHandler> http =
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do_GetService(NS_NETWORK_PROTOCOL_CONTRACTID_PREFIX "http", &res);
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if (!NS_FAILED(res)) {
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nsAutoCString string;
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res = http->GetPlatform(string);
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if (!NS_FAILED(res)) {
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aWriter.StringProperty("platform", string.Data());
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if (!aPreRecordedMetaInformation.mHttpPlatform.IsEmpty()) {
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aWriter.StringProperty("platform",
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aPreRecordedMetaInformation.mHttpPlatform.Data());
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}
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if (!aPreRecordedMetaInformation.mHttpOscpu.IsEmpty()) {
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aWriter.StringProperty("oscpu",
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aPreRecordedMetaInformation.mHttpOscpu.Data());
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}
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if (!aPreRecordedMetaInformation.mHttpMisc.IsEmpty()) {
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aWriter.StringProperty("misc",
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aPreRecordedMetaInformation.mHttpMisc.Data());
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}
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res = http->GetOscpu(string);
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if (!NS_FAILED(res)) {
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aWriter.StringProperty("oscpu", string.Data());
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if (!aPreRecordedMetaInformation.mRuntimeABI.IsEmpty()) {
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aWriter.StringProperty("abi",
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aPreRecordedMetaInformation.mRuntimeABI.Data());
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}
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if (!aPreRecordedMetaInformation.mRuntimeToolkit.IsEmpty()) {
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aWriter.StringProperty("toolkit",
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aPreRecordedMetaInformation.mRuntimeToolkit.Data());
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}
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res = http->GetMisc(string);
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if (!NS_FAILED(res)) {
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aWriter.StringProperty("misc", string.Data());
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if (!aPreRecordedMetaInformation.mAppInfoProduct.IsEmpty()) {
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aWriter.StringProperty("product",
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aPreRecordedMetaInformation.mAppInfoProduct.Data());
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}
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if (!aPreRecordedMetaInformation.mAppInfoAppBuildID.IsEmpty()) {
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aWriter.StringProperty(
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"appBuildID", aPreRecordedMetaInformation.mAppInfoAppBuildID.Data());
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}
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if (!aPreRecordedMetaInformation.mAppInfoSourceURL.IsEmpty()) {
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aWriter.StringProperty(
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"sourceURL", aPreRecordedMetaInformation.mAppInfoSourceURL.Data());
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}
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nsCOMPtr<nsIXULRuntime> runtime = do_GetService("@mozilla.org/xre/runtime;1");
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if (runtime) {
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nsAutoCString string;
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res = runtime->GetXPCOMABI(string);
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if (!NS_FAILED(res)) aWriter.StringProperty("abi", string.Data());
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res = runtime->GetWidgetToolkit(string);
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if (!NS_FAILED(res)) aWriter.StringProperty("toolkit", string.Data());
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}
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nsCOMPtr<nsIXULAppInfo> appInfo =
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do_GetService("@mozilla.org/xre/app-info;1");
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if (appInfo) {
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nsAutoCString string;
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res = appInfo->GetName(string);
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if (!NS_FAILED(res)) aWriter.StringProperty("product", string.Data());
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res = appInfo->GetAppBuildID(string);
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if (!NS_FAILED(res)) aWriter.StringProperty("appBuildID", string.Data());
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res = appInfo->GetSourceURL(string);
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if (!NS_FAILED(res)) aWriter.StringProperty("sourceURL", string.Data());
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}
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ProcessInfo processInfo;
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processInfo.cpuCount = 0;
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processInfo.cpuCores = 0;
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if (NS_SUCCEEDED(CollectProcessInfo(processInfo))) {
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if (processInfo.cpuCores > 0) {
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aWriter.IntProperty("physicalCPUs", processInfo.cpuCores);
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}
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if (processInfo.cpuCount > 0) {
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aWriter.IntProperty("logicalCPUs", processInfo.cpuCount);
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if (aPreRecordedMetaInformation.mProcessInfoCpuCores > 0) {
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aWriter.IntProperty("physicalCPUs",
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aPreRecordedMetaInformation.mProcessInfoCpuCores);
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}
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if (aPreRecordedMetaInformation.mProcessInfoCpuCount > 0) {
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aWriter.IntProperty("logicalCPUs",
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aPreRecordedMetaInformation.mProcessInfoCpuCount);
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}
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// We should avoid collecting extension metadata for profiler while XPCOM is
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@ -2614,6 +2673,7 @@ profiler_code_address_service_for_presymbolication() {
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static void locked_profiler_stream_json_for_this_process(
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PSLockRef aLock, SpliceableJSONWriter& aWriter, double aSinceTime,
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const PreRecordedMetaInformation& aPreRecordedMetaInformation,
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bool aIsShuttingDown, ProfilerCodeAddressService* aService) {
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LOG("locked_profiler_stream_json_for_this_process");
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@ -2639,7 +2699,10 @@ static void locked_profiler_stream_json_for_this_process(
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// Put meta data
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aWriter.StartObjectProperty("meta");
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{ StreamMetaJSCustomObject(aLock, aWriter, aIsShuttingDown); }
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{
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StreamMetaJSCustomObject(aLock, aWriter, aIsShuttingDown,
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aPreRecordedMetaInformation);
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}
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aWriter.EndObject();
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// Put page data
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@ -2743,6 +2806,8 @@ bool profiler_stream_json_for_this_process(
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MOZ_RELEASE_ASSERT(CorePS::Exists());
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const auto preRecordedMetaInformation = PreRecordMetaInformation();
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PSAutoLock lock(gPSMutex);
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if (!ActivePS::Exists(lock)) {
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@ -2750,6 +2815,7 @@ bool profiler_stream_json_for_this_process(
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}
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locked_profiler_stream_json_for_this_process(lock, aWriter, aSinceTime,
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preRecordedMetaInformation,
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aIsShuttingDown, aService);
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return true;
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}
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@ -3933,8 +3999,9 @@ void profiler_init(void* aStackTop) {
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filters.length(), 0);
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}
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static void locked_profiler_save_profile_to_file(PSLockRef aLock,
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const char* aFilename,
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static void locked_profiler_save_profile_to_file(
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PSLockRef aLock, const char* aFilename,
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const PreRecordedMetaInformation& aPreRecordedMetaInformation,
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bool aIsShuttingDown);
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static SamplerThread* locked_profiler_stop(PSLockRef aLock);
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@ -3947,6 +4014,8 @@ void profiler_shutdown(IsFastShutdown aIsFastShutdown) {
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MOZ_RELEASE_ASSERT(NS_IsMainThread());
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MOZ_RELEASE_ASSERT(CorePS::Exists());
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const auto preRecordedMetaInformation = PreRecordMetaInformation();
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ProfilerParent::ProfilerWillStopIfStarted();
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// If the profiler is active we must get a handle to the SamplerThread before
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@ -3960,6 +4029,7 @@ void profiler_shutdown(IsFastShutdown aIsFastShutdown) {
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const char* filename = getenv("MOZ_PROFILER_SHUTDOWN");
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if (filename) {
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locked_profiler_save_profile_to_file(lock, filename,
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preRecordedMetaInformation,
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/* aIsShuttingDown */ true);
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}
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if (aIsFastShutdown == IsFastShutdown::Yes) {
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@ -4171,8 +4241,9 @@ Vector<nsCString> profiler_move_exit_profiles() {
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return profiles;
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}
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static void locked_profiler_save_profile_to_file(PSLockRef aLock,
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const char* aFilename,
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static void locked_profiler_save_profile_to_file(
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PSLockRef aLock, const char* aFilename,
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const PreRecordedMetaInformation& aPreRecordedMetaInformation,
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bool aIsShuttingDown = false) {
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LOG("locked_profiler_save_profile_to_file(%s)", aFilename);
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@ -4185,6 +4256,7 @@ static void locked_profiler_save_profile_to_file(PSLockRef aLock,
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w.Start();
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{
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locked_profiler_stream_json_for_this_process(aLock, w, /* sinceTime */ 0,
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aPreRecordedMetaInformation,
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aIsShuttingDown, nullptr);
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w.StartArrayProperty("processes");
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@ -4207,13 +4279,16 @@ void profiler_save_profile_to_file(const char* aFilename) {
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MOZ_RELEASE_ASSERT(CorePS::Exists());
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const auto preRecordedMetaInformation = PreRecordMetaInformation();
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PSAutoLock lock(gPSMutex);
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if (!ActivePS::Exists(lock)) {
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return;
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}
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locked_profiler_save_profile_to_file(lock, aFilename);
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locked_profiler_save_profile_to_file(lock, aFilename,
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preRecordedMetaInformation);
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}
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uint32_t profiler_get_available_features() {
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