This revision was automatically updated to reflect the committed changes.
Closed by commit rL325480: [clangd] Tracing: name worker threads, and enforce 
naming scheduled async tasks (authored by sammccall, committed by ).
Herald added a subscriber: llvm-commits.

Changed prior to commit:
  https://reviews.llvm.org/D43388?vs=134617&id=134869#toc

Repository:
  rL LLVM

https://reviews.llvm.org/D43388

Files:
  clang-tools-extra/trunk/clangd/ClangdServer.cpp
  clang-tools-extra/trunk/clangd/TUScheduler.cpp
  clang-tools-extra/trunk/clangd/TUScheduler.h
  clang-tools-extra/trunk/clangd/Threading.cpp
  clang-tools-extra/trunk/clangd/Threading.h
  clang-tools-extra/trunk/clangd/Trace.cpp
  clang-tools-extra/trunk/clangd/Trace.h
  clang-tools-extra/trunk/unittests/clangd/TUSchedulerTests.cpp
  clang-tools-extra/trunk/unittests/clangd/ThreadingTests.cpp

Index: clang-tools-extra/trunk/unittests/clangd/TUSchedulerTests.cpp
===================================================================
--- clang-tools-extra/trunk/unittests/clangd/TUSchedulerTests.cpp
+++ clang-tools-extra/trunk/unittests/clangd/TUSchedulerTests.cpp
@@ -54,31 +54,33 @@
 
   // Assert each operation for missing file is an error (even if it's available
   // in VFS).
-  S.runWithAST(Missing, [&](llvm::Expected<InputsAndAST> AST) {
+  S.runWithAST("", Missing, [&](llvm::Expected<InputsAndAST> AST) {
     ASSERT_FALSE(bool(AST));
     ignoreError(AST.takeError());
   });
-  S.runWithPreamble(Missing, [&](llvm::Expected<InputsAndPreamble> Preamble) {
-    ASSERT_FALSE(bool(Preamble));
-    ignoreError(Preamble.takeError());
-  });
+  S.runWithPreamble("", Missing,
+                    [&](llvm::Expected<InputsAndPreamble> Preamble) {
+                      ASSERT_FALSE(bool(Preamble));
+                      ignoreError(Preamble.takeError());
+                    });
   // remove() shouldn't crash on missing files.
   S.remove(Missing);
 
   // Assert there aren't any errors for added file.
-  S.runWithAST(
-      Added, [&](llvm::Expected<InputsAndAST> AST) { EXPECT_TRUE(bool(AST)); });
-  S.runWithPreamble(Added, [&](llvm::Expected<InputsAndPreamble> Preamble) {
+  S.runWithAST("", Added, [&](llvm::Expected<InputsAndAST> AST) {
+    EXPECT_TRUE(bool(AST));
+  });
+  S.runWithPreamble("", Added, [&](llvm::Expected<InputsAndPreamble> Preamble) {
     EXPECT_TRUE(bool(Preamble));
   });
   S.remove(Added);
 
   // Assert that all operations fail after removing the file.
-  S.runWithAST(Added, [&](llvm::Expected<InputsAndAST> AST) {
+  S.runWithAST("", Added, [&](llvm::Expected<InputsAndAST> AST) {
     ASSERT_FALSE(bool(AST));
     ignoreError(AST.takeError());
   });
-  S.runWithPreamble(Added, [&](llvm::Expected<InputsAndPreamble> Preamble) {
+  S.runWithPreamble("", Added, [&](llvm::Expected<InputsAndPreamble> Preamble) {
     ASSERT_FALSE(bool(Preamble));
     ignoreError(Preamble.takeError());
   });
@@ -143,24 +145,27 @@
 
         {
           WithContextValue WithNonce(NonceKey, ++Nonce);
-          S.runWithAST(File, [Inputs, Nonce, &Mut, &TotalASTReads](
-                                 llvm::Expected<InputsAndAST> AST) {
-            EXPECT_THAT(Context::current().get(NonceKey), Pointee(Nonce));
-
-            ASSERT_TRUE((bool)AST);
-            EXPECT_EQ(AST->Inputs.FS, Inputs.FS);
-            EXPECT_EQ(AST->Inputs.Contents, Inputs.Contents);
-
-            std::lock_guard<std::mutex> Lock(Mut);
-            ++TotalASTReads;
-          });
+          S.runWithAST("CheckAST", File,
+                       [Inputs, Nonce, &Mut,
+                        &TotalASTReads](llvm::Expected<InputsAndAST> AST) {
+                         EXPECT_THAT(Context::current().get(NonceKey),
+                                     Pointee(Nonce));
+
+                         ASSERT_TRUE((bool)AST);
+                         EXPECT_EQ(AST->Inputs.FS, Inputs.FS);
+                         EXPECT_EQ(AST->Inputs.Contents, Inputs.Contents);
+
+                         std::lock_guard<std::mutex> Lock(Mut);
+                         ++TotalASTReads;
+                       });
         }
 
         {
           WithContextValue WithNonce(NonceKey, ++Nonce);
           S.runWithPreamble(
-              File, [Inputs, Nonce, &Mut, &TotalPreambleReads](
-                        llvm::Expected<InputsAndPreamble> Preamble) {
+              "CheckPreamble", File,
+              [Inputs, Nonce, &Mut, &TotalPreambleReads](
+                  llvm::Expected<InputsAndPreamble> Preamble) {
                 EXPECT_THAT(Context::current().get(NonceKey), Pointee(Nonce));
 
                 ASSERT_TRUE((bool)Preamble);
Index: clang-tools-extra/trunk/unittests/clangd/ThreadingTests.cpp
===================================================================
--- clang-tools-extra/trunk/unittests/clangd/ThreadingTests.cpp
+++ clang-tools-extra/trunk/unittests/clangd/ThreadingTests.cpp
@@ -29,7 +29,7 @@
     AsyncTaskRunner Tasks;
     auto scheduleIncrements = [&]() {
       for (int TaskI = 0; TaskI < TasksCnt; ++TaskI) {
-        Tasks.runAsync([&Counter, &Mutex, IncrementsPerTask]() {
+        Tasks.runAsync("task", [&Counter, &Mutex, IncrementsPerTask]() {
           for (int Increment = 0; Increment < IncrementsPerTask; ++Increment) {
             std::lock_guard<std::mutex> Lock(Mutex);
             ++Counter;
Index: clang-tools-extra/trunk/clangd/ClangdServer.cpp
===================================================================
--- clang-tools-extra/trunk/clangd/ClangdServer.cpp
+++ clang-tools-extra/trunk/clangd/ClangdServer.cpp
@@ -179,9 +179,10 @@
     Callback(make_tagged(std::move(Result), std::move(TaggedFS.Tag)));
   };
 
-  WorkScheduler.runWithPreamble(File, BindWithForward(Task, std::move(Contents),
-                                                      File.str(),
-                                                      std::move(Callback)));
+  WorkScheduler.runWithPreamble("CodeComplete", File,
+                                BindWithForward(Task, std::move(Contents),
+                                                File.str(),
+                                                std::move(Callback)));
 }
 
 void ClangdServer::signatureHelp(
@@ -222,7 +223,8 @@
   };
 
   WorkScheduler.runWithPreamble(
-      File, BindWithForward(Action, File.str(), std::move(Callback)));
+      "SignatureHelp", File,
+      BindWithForward(Action, File.str(), std::move(Callback)));
 }
 
 llvm::Expected<tooling::Replacements>
@@ -307,7 +309,7 @@
   };
 
   WorkScheduler.runWithAST(
-      File,
+      "Rename", File,
       BindWithForward(Action, File.str(), NewName.str(), std::move(Callback)));
 }
 
@@ -376,7 +378,8 @@
     Callback(Result);
   };
 
-  WorkScheduler.runWithAST(File, BindWithForward(Action, std::move(Callback)));
+  WorkScheduler.runWithAST("DumpAST", File,
+                           BindWithForward(Action, std::move(Callback)));
 }
 
 void ClangdServer::findDefinitions(
@@ -392,7 +395,8 @@
     Callback(make_tagged(std::move(Result), TaggedFS.Tag));
   };
 
-  WorkScheduler.runWithAST(File, BindWithForward(Action, std::move(Callback)));
+  WorkScheduler.runWithAST("Definitions", File,
+                           BindWithForward(Action, std::move(Callback)));
 }
 
 llvm::Optional<Path> ClangdServer::switchSourceHeader(PathRef Path) {
@@ -488,7 +492,8 @@
     Callback(make_tagged(std::move(Result), TaggedFS.Tag));
   };
 
-  WorkScheduler.runWithAST(File, BindWithForward(Action, std::move(Callback)));
+  WorkScheduler.runWithAST("Highlights", File,
+                           BindWithForward(Action, std::move(Callback)));
 }
 
 void ClangdServer::findHover(
@@ -511,7 +516,8 @@
     Callback(make_tagged(std::move(Result), TaggedFS.Tag));
   };
 
-  WorkScheduler.runWithAST(File, BindWithForward(Action, std::move(Callback)));
+  WorkScheduler.runWithAST("Hover", File,
+                           BindWithForward(Action, std::move(Callback)));
 }
 
 void ClangdServer::scheduleReparseAndDiags(
Index: clang-tools-extra/trunk/clangd/Threading.cpp
===================================================================
--- clang-tools-extra/trunk/clangd/Threading.cpp
+++ clang-tools-extra/trunk/clangd/Threading.cpp
@@ -34,7 +34,8 @@
                       [&] { return InFlightTasks == 0; });
 }
 
-void AsyncTaskRunner::runAsync(UniqueFunction<void()> Action) {
+void AsyncTaskRunner::runAsync(llvm::Twine Name,
+                               UniqueFunction<void()> Action) {
   {
     std::lock_guard<std::mutex> Lock(Mutex);
     ++InFlightTasks;
@@ -51,13 +52,14 @@
   });
 
   std::thread(
-      [](decltype(Action) Action, decltype(CleanupTask)) {
+      [](std::string Name, decltype(Action) Action, decltype(CleanupTask)) {
+        llvm::set_thread_name(Name);
         Action();
         // Make sure function stored by Action is destroyed before CleanupTask
         // is run.
         Action = nullptr;
       },
-      std::move(Action), std::move(CleanupTask))
+      Name.str(), std::move(Action), std::move(CleanupTask))
       .detach();
 }
 
Index: clang-tools-extra/trunk/clangd/Trace.h
===================================================================
--- clang-tools-extra/trunk/clangd/Trace.h
+++ clang-tools-extra/trunk/clangd/Trace.h
@@ -82,7 +82,7 @@
 /// SomeJSONExpr is evaluated and copied only if actually needed.
 class Span {
 public:
-  Span(llvm::StringRef Name);
+  Span(llvm::Twine Name);
   ~Span();
 
   /// Mutable metadata, if this span is interested.
Index: clang-tools-extra/trunk/clangd/TUScheduler.cpp
===================================================================
--- clang-tools-extra/trunk/clangd/TUScheduler.cpp
+++ clang-tools-extra/trunk/clangd/TUScheduler.cpp
@@ -44,8 +44,10 @@
 
 #include "TUScheduler.h"
 #include "Logger.h"
+#include "Trace.h"
 #include "clang/Frontend/PCHContainerOperations.h"
 #include "llvm/Support/Errc.h"
+#include "llvm/Support/Path.h"
 #include <memory>
 #include <queue>
 #include <thread>
@@ -67,22 +69,24 @@
 /// worker.
 class ASTWorker {
   friend class ASTWorkerHandle;
-  ASTWorker(Semaphore &Barrier, CppFile AST, bool RunSync);
+  ASTWorker(llvm::StringRef File, Semaphore &Barrier, CppFile AST,
+            bool RunSync);
 
 public:
   /// Create a new ASTWorker and return a handle to it.
   /// The processing thread is spawned using \p Tasks. However, when \p Tasks
   /// is null, all requests will be processed on the calling thread
   /// synchronously instead. \p Barrier is acquired when processing each
   /// request, it is be used to limit the number of actively running threads.
-  static ASTWorkerHandle Create(AsyncTaskRunner *Tasks, Semaphore &Barrier,
-                                CppFile AST);
+  static ASTWorkerHandle Create(llvm::StringRef File, AsyncTaskRunner *Tasks,
+                                Semaphore &Barrier, CppFile AST);
   ~ASTWorker();
 
   void update(ParseInputs Inputs,
               UniqueFunction<void(llvm::Optional<std::vector<DiagWithFixIts>>)>
                   OnUpdated);
-  void runWithAST(UniqueFunction<void(llvm::Expected<InputsAndAST>)> Action);
+  void runWithAST(llvm::StringRef Name,
+                  UniqueFunction<void(llvm::Expected<InputsAndAST>)> Action);
   bool blockUntilIdle(Deadline Timeout) const;
 
   std::shared_ptr<const PreambleData> getPossiblyStalePreamble() const;
@@ -96,11 +100,16 @@
   /// Signal that run() should finish processing pending requests and exit.
   void stop();
   /// Adds a new task to the end of the request queue.
-  void startTask(UniqueFunction<void()> Task, bool isUpdate,
-                 llvm::Optional<CancellationFlag> CF);
+  void startTask(llvm::StringRef Name, UniqueFunction<void()> Task,
+                 bool isUpdate, llvm::Optional<CancellationFlag> CF);
 
-  using RequestWithCtx = std::pair<UniqueFunction<void()>, Context>;
+  struct Request {
+    UniqueFunction<void()> Action;
+    std::string Name;
+    Context Ctx;
+  };
 
+  std::string File;
   const bool RunSync;
   Semaphore &Barrier;
   // AST and FileInputs are only accessed on the processing thread from run().
@@ -114,7 +123,7 @@
   std::size_t LastASTSize; /* GUARDED_BY(Mutex) */
   // Set to true to signal run() to finish processing.
   bool Done;                           /* GUARDED_BY(Mutex) */
-  std::queue<RequestWithCtx> Requests; /* GUARDED_BY(Mutex) */
+  std::queue<Request> Requests;        /* GUARDED_BY(Mutex) */
   // Only set when last request is an update. This allows us to cancel an update
   // that was never read, if a subsequent update comes in.
   llvm::Optional<CancellationFlag> LastUpdateCF; /* GUARDED_BY(Mutex) */
@@ -163,18 +172,21 @@
   std::shared_ptr<ASTWorker> Worker;
 };
 
-ASTWorkerHandle ASTWorker::Create(AsyncTaskRunner *Tasks, Semaphore &Barrier,
-                                  CppFile AST) {
+ASTWorkerHandle ASTWorker::Create(llvm::StringRef File, AsyncTaskRunner *Tasks,
+                                  Semaphore &Barrier, CppFile AST) {
   std::shared_ptr<ASTWorker> Worker(
-      new ASTWorker(Barrier, std::move(AST), /*RunSync=*/!Tasks));
+      new ASTWorker(File, Barrier, std::move(AST), /*RunSync=*/!Tasks));
   if (Tasks)
-    Tasks->runAsync([Worker]() { Worker->run(); });
+    Tasks->runAsync("worker:" + llvm::sys::path::filename(File),
+                    [Worker]() { Worker->run(); });
 
   return ASTWorkerHandle(std::move(Worker));
 }
 
-ASTWorker::ASTWorker(Semaphore &Barrier, CppFile AST, bool RunSync)
-    : RunSync(RunSync), Barrier(Barrier), AST(std::move(AST)), Done(false) {
+ASTWorker::ASTWorker(llvm::StringRef File, Semaphore &Barrier, CppFile AST,
+                     bool RunSync)
+    : File(File), RunSync(RunSync), Barrier(Barrier), AST(std::move(AST)),
+      Done(false) {
   if (RunSync)
     return;
 }
@@ -212,11 +224,12 @@
   };
 
   CancellationFlag UpdateCF;
-  startTask(BindWithForward(Task, UpdateCF, std::move(OnUpdated)),
+  startTask("Update", BindWithForward(Task, UpdateCF, std::move(OnUpdated)),
             /*isUpdate=*/true, UpdateCF);
 }
 
 void ASTWorker::runWithAST(
+    llvm::StringRef Name,
     UniqueFunction<void(llvm::Expected<InputsAndAST>)> Action) {
   auto Task = [=](decltype(Action) Action) {
     ParsedAST *ActualAST = AST.getAST();
@@ -233,8 +246,8 @@
     LastASTSize = ActualAST->getUsedBytes();
   };
 
-  startTask(BindWithForward(Task, std::move(Action)), /*isUpdate=*/false,
-            llvm::None);
+  startTask(Name, BindWithForward(Task, std::move(Action)),
+            /*isUpdate=*/false, llvm::None);
 }
 
 std::shared_ptr<const PreambleData>
@@ -257,13 +270,14 @@
   RequestsCV.notify_all();
 }
 
-void ASTWorker::startTask(UniqueFunction<void()> Task, bool isUpdate,
-                          llvm::Optional<CancellationFlag> CF) {
+void ASTWorker::startTask(llvm::StringRef Name, UniqueFunction<void()> Task,
+                          bool isUpdate, llvm::Optional<CancellationFlag> CF) {
   assert(isUpdate == CF.hasValue() &&
          "Only updates are expected to pass CancellationFlag");
 
   if (RunSync) {
     assert(!Done && "running a task after stop()");
+    trace::Span Tracer(Name + ":" + llvm::sys::path::filename(File));
     Task();
     return;
   }
@@ -281,14 +295,14 @@
     } else {
       LastUpdateCF = llvm::None;
     }
-    Requests.emplace(std::move(Task), Context::current().clone());
+    Requests.push({std::move(Task), Name, Context::current().clone()});
   } // unlock Mutex.
   RequestsCV.notify_all();
 }
 
 void ASTWorker::run() {
   while (true) {
-    RequestWithCtx Req;
+    Request Req;
     {
       std::unique_lock<std::mutex> Lock(Mutex);
       RequestsCV.wait(Lock, [&]() { return Done || !Requests.empty(); });
@@ -303,9 +317,12 @@
       // Leave it on the queue for now, so waiters don't see an empty queue.
     } // unlock Mutex
 
-    std::lock_guard<Semaphore> BarrierLock(Barrier);
-    WithContext Guard(std::move(Req.second));
-    Req.first();
+    {
+      std::lock_guard<Semaphore> BarrierLock(Barrier);
+      WithContext Guard(std::move(Req.Ctx));
+      trace::Span Tracer(Req.Name);
+      Req.Action();
+    }
 
     {
       std::lock_guard<std::mutex> Lock(Mutex);
@@ -379,7 +396,7 @@
   if (!FD) {
     // Create a new worker to process the AST-related tasks.
     ASTWorkerHandle Worker = ASTWorker::Create(
-        WorkerThreads ? WorkerThreads.getPointer() : nullptr, Barrier,
+        File, WorkerThreads ? WorkerThreads.getPointer() : nullptr, Barrier,
         CppFile(File, StorePreamblesInMemory, PCHOps, ASTCallback));
     FD = std::unique_ptr<FileData>(new FileData{Inputs, std::move(Worker)});
   } else {
@@ -396,20 +413,21 @@
 }
 
 void TUScheduler::runWithAST(
-    PathRef File, UniqueFunction<void(llvm::Expected<InputsAndAST>)> Action) {
+    llvm::StringRef Name, PathRef File,
+    UniqueFunction<void(llvm::Expected<InputsAndAST>)> Action) {
   auto It = Files.find(File);
   if (It == Files.end()) {
     Action(llvm::make_error<llvm::StringError>(
         "trying to get AST for non-added document",
         llvm::errc::invalid_argument));
     return;
   }
 
-  It->second->Worker->runWithAST(std::move(Action));
+  It->second->Worker->runWithAST(Name, std::move(Action));
 }
 
 void TUScheduler::runWithPreamble(
-    PathRef File,
+    llvm::StringRef Name, PathRef File,
     UniqueFunction<void(llvm::Expected<InputsAndPreamble>)> Action) {
   auto It = Files.find(File);
   if (It == Files.end()) {
@@ -420,25 +438,32 @@
   }
 
   if (!PreambleTasks) {
+    trace::Span Tracer(Name);
+    SPAN_ATTACH(Tracer, "file", File);
     std::shared_ptr<const PreambleData> Preamble =
         It->second->Worker->getPossiblyStalePreamble();
     Action(InputsAndPreamble{It->second->Inputs, Preamble.get()});
     return;
   }
 
   ParseInputs InputsCopy = It->second->Inputs;
   std::shared_ptr<const ASTWorker> Worker = It->second->Worker.lock();
-  auto Task = [InputsCopy, Worker, this](Context Ctx,
+  auto Task = [InputsCopy, Worker, this](std::string Name, std::string File,
+                                         Context Ctx,
                                          decltype(Action) Action) mutable {
     std::lock_guard<Semaphore> BarrierLock(Barrier);
     WithContext Guard(std::move(Ctx));
+    trace::Span Tracer(Name);
+    SPAN_ATTACH(Tracer, "file", File);
     std::shared_ptr<const PreambleData> Preamble =
         Worker->getPossiblyStalePreamble();
     Action(InputsAndPreamble{InputsCopy, Preamble.get()});
   };
 
   PreambleTasks->runAsync(
-      BindWithForward(Task, Context::current().clone(), std::move(Action)));
+      "task:" + llvm::sys::path::filename(File),
+      BindWithForward(Task, std::string(Name), std::string(File),
+                      Context::current().clone(), std::move(Action)));
 }
 
 std::vector<std::pair<Path, std::size_t>>
Index: clang-tools-extra/trunk/clangd/Threading.h
===================================================================
--- clang-tools-extra/trunk/clangd/Threading.h
+++ clang-tools-extra/trunk/clangd/Threading.h
@@ -12,6 +12,7 @@
 
 #include "Context.h"
 #include "Function.h"
+#include "llvm/ADT/Twine.h"
 #include <atomic>
 #include <cassert>
 #include <condition_variable>
@@ -81,7 +82,8 @@
 
   void wait() const { (void) wait(llvm::None); }
   LLVM_NODISCARD bool wait(Deadline D) const;
-  void runAsync(UniqueFunction<void()> Action);
+  // The name is used for tracing and debugging (e.g. to name a spawned thread).
+  void runAsync(llvm::Twine Name, UniqueFunction<void()> Action);
 
 private:
   mutable std::mutex Mutex;
Index: clang-tools-extra/trunk/clangd/Trace.cpp
===================================================================
--- clang-tools-extra/trunk/clangd/Trace.cpp
+++ clang-tools-extra/trunk/clangd/Trace.cpp
@@ -208,17 +208,19 @@
 }
 
 // Returned context owns Args.
-static Context makeSpanContext(llvm::StringRef Name, json::obj *Args) {
+static Context makeSpanContext(llvm::Twine Name, json::obj *Args) {
   if (!T)
     return Context::current().clone();
   WithContextValue WithArgs{std::unique_ptr<json::obj>(Args)};
-  return T->beginSpan(Name, Args);
+  return T->beginSpan(Name.isSingleStringRef() ? Name.getSingleStringRef()
+                                               : llvm::StringRef(Name.str()),
+                      Args);
 }
 
 // Span keeps a non-owning pointer to the args, which is how users access them.
 // The args are owned by the context though. They stick around until the
 // beginSpan() context is destroyed, when the tracing engine will consume them.
-Span::Span(llvm::StringRef Name)
+Span::Span(llvm::Twine Name)
     : Args(T ? new json::obj() : nullptr),
       RestoreCtx(makeSpanContext(Name, Args)) {}
 
Index: clang-tools-extra/trunk/clangd/TUScheduler.h
===================================================================
--- clang-tools-extra/trunk/clangd/TUScheduler.h
+++ clang-tools-extra/trunk/clangd/TUScheduler.h
@@ -37,7 +37,7 @@
 /// TUScheduler is not thread-safe, only one thread should be providing updates
 /// and scheduling tasks.
 /// Callbacks are run on a threadpool and it's appropriate to do slow work in
-/// them.
+/// them. Each task has a name, used for tracing (should be UpperCamelCase).
 class TUScheduler {
 public:
   TUScheduler(unsigned AsyncThreadsCount, bool StorePreamblesInMemory,
@@ -65,16 +65,16 @@
   /// \p Action is executed.
   /// If an error occurs during processing, it is forwarded to the \p Action
   /// callback.
-  void runWithAST(PathRef File,
+  void runWithAST(llvm::StringRef Name, PathRef File,
                   UniqueFunction<void(llvm::Expected<InputsAndAST>)> Action);
 
   /// Schedule an async read of the Preamble. Preamble passed to \p Action may
   /// be built for any version of the file, callers must not rely on it being
   /// consistent with the current version of the file.
   /// If an error occurs during processing, it is forwarded to the \p Action
   /// callback.
   void runWithPreamble(
-      PathRef File,
+      llvm::StringRef Name, PathRef File,
       UniqueFunction<void(llvm::Expected<InputsAndPreamble>)> Action);
 
   /// Wait until there are no scheduled or running tasks.
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