From 4829a8643dd1eb96511853ff41063190f0b28ee9 Mon Sep 17 00:00:00 2001
From: Adlai Holler <adlai@icloud.com>
Date: Mon, 19 Jun 2017 10:14:39 -0700
Subject: [PATCH] Improve System Trace Implementation #trivial (#368)

* Improve the kdebug, system trace integration

* Remove superseded subsystem

* Address review comments

* Please the license header gods

* Address harder

* Fix node block retaining collection view
---
 AsyncDisplayKit.xcodeproj/project.pbxproj     |   1 +
 .../SystemTrace.tracetemplate                 | Bin 0 -> 171474 bytes
 Source/ASCollectionView.mm                    |   2 +-
 Source/ASDisplayNode.mm                       |  18 ++++-
 Source/ASRunLoopQueue.mm                      |  71 ++++++++++++++++-
 Source/Base/ASAssert.m                        |   8 +-
 Source/Base/ASBaseDefines.h                   |  18 +++++
 Source/Base/ASLog.h                           |  73 ++++++++++++++----
 Source/Details/ASDataController.mm            |  50 ++----------
 Source/Details/ASRangeController.mm           |   4 +-
 Source/Details/ASThread.h                     |   2 -
 .../Transactions/_ASAsyncTransaction.mm       |   4 -
 Source/Layout/ASLayoutElement.mm              |  23 ++----
 Source/Private/ASDisplayNode+AsyncDisplay.mm  |  14 ++++
 .../Component/ASTextDebugOption.m             |   1 -
 Tests/ASTableViewThrashTests.m                |  22 ++++--
 16 files changed, 209 insertions(+), 102 deletions(-)
 create mode 100644 InstrumentsTemplates/SystemTrace.tracetemplate

diff --git a/AsyncDisplayKit.xcodeproj/project.pbxproj b/AsyncDisplayKit.xcodeproj/project.pbxproj
index 2cd660f06b..53ab654378 100644
--- a/AsyncDisplayKit.xcodeproj/project.pbxproj
+++ b/AsyncDisplayKit.xcodeproj/project.pbxproj
@@ -2627,6 +2627,7 @@
 				GCC_INSTRUMENT_PROGRAM_FLOW_ARCS = NO;
 				GCC_NO_COMMON_BLOCKS = YES;
 				GCC_PRECOMPILE_PREFIX_HEADER = YES;
+				GCC_PREPROCESSOR_DEFINITIONS = "PROFILE=1";
 				INFOPLIST_FILE = "$(SRCROOT)/Source/Info.plist";
 				INSTALL_PATH = "$(LOCAL_LIBRARY_DIR)/Frameworks";
 				LD_RUNPATH_SEARCH_PATHS = "$(inherited) @executable_path/Frameworks @loader_path/Frameworks";
diff --git a/InstrumentsTemplates/SystemTrace.tracetemplate b/InstrumentsTemplates/SystemTrace.tracetemplate
new file mode 100644
index 0000000000000000000000000000000000000000..48cc3e6aef2b107877b7be090f060d1c1ca6a318
GIT binary patch
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literal 0
HcmV?d00001

diff --git a/Source/ASCollectionView.mm b/Source/ASCollectionView.mm
index 519f0ecdaa..68b4c34680 100644
--- a/Source/ASCollectionView.mm
+++ b/Source/ASCollectionView.mm
@@ -1675,7 +1675,7 @@ static NSString * const kReuseIdentifier = @"_ASCollectionReuseIdentifier";
     if (node.interactionDelegate == nil) {
       node.interactionDelegate = strongSelf;
     }
-    if (_inverted) {
+    if (strongSelf.inverted) {
       node.transform = CATransform3DMakeScale(1, -1, 1) ;
     }
     return node;
diff --git a/Source/ASDisplayNode.mm b/Source/ASDisplayNode.mm
index e866548d51..781862fe63 100644
--- a/Source/ASDisplayNode.mm
+++ b/Source/ASDisplayNode.mm
@@ -957,9 +957,25 @@ static ASDisplayNodeMethodOverrides GetASDisplayNodeMethodOverrides(Class c)
                      restrictedToSize:(ASLayoutElementSize)size
                  relativeToParentSize:(CGSize)parentSize
 {
+  // Use a pthread specific to mark when this method is called re-entrant on same thread.
+  // We only want one calculateLayout signpost interval per thread.
+  // This is fast enough to do it unconditionally.
+  auto key = ASPthreadStaticKey(NULL);
+  BOOL isRootCall = (pthread_getspecific(key) == NULL);
+  if (isRootCall) {
+    pthread_setspecific(key, kCFBooleanTrue);
+    ASSignpostStart(ASSignpostCalculateLayout);
+  }
+
   ASSizeRange styleAndParentSize = ASLayoutElementSizeResolve(self.style.size, parentSize);
   const ASSizeRange resolvedRange = ASSizeRangeIntersect(constrainedSize, styleAndParentSize);
-  return [self calculateLayoutThatFits:resolvedRange];
+  ASLayout *result = [self calculateLayoutThatFits:resolvedRange];
+
+  if (isRootCall) {
+    pthread_setspecific(key, NULL);
+    ASSignpostEnd(ASSignpostCalculateLayout);
+  }
+  return result;
 }
 
 - (ASLayout *)calculateLayoutThatFits:(ASSizeRange)constrainedSize
diff --git a/Source/ASRunLoopQueue.mm b/Source/ASRunLoopQueue.mm
index 7597e47d22..e45ac09990 100644
--- a/Source/ASRunLoopQueue.mm
+++ b/Source/ASRunLoopQueue.mm
@@ -19,7 +19,7 @@
 #import <AsyncDisplayKit/ASRunLoopQueue.h>
 #import <AsyncDisplayKit/ASThread.h>
 #import <AsyncDisplayKit/ASLog.h>
-
+#import <QuartzCore/QuartzCore.h>
 #import <cstdlib>
 #import <deque>
 #import <vector>
@@ -78,16 +78,20 @@ static void runLoopSourceCallback(void *info) {
         return;
       }
       // The scope below is entered while already locked. @autorelease is crucial here; see PR 2890.
+      NSInteger count;
       @autoreleasepool {
 #if ASRunLoopQueueLoggingEnabled
         NSLog(@"ASDeallocQueue Processing: %lu objects destroyed", weakSelf->_queue.size());
 #endif
         // Sometimes we release 10,000 objects at a time.  Don't hold the lock while releasing.
         std::deque<id> currentQueue = weakSelf->_queue;
+        count = currentQueue.size();
+        ASSignpostStartCustom(ASSignpostDeallocQueueDrain, self, count);
         weakSelf->_queue = std::deque<id>();
         weakSelf->_queueLock.unlock();
         currentQueue.clear();
       }
+      ASSignpostEndCustom(ASSignpostDeallocQueueDrain, self, count, ASSignpostColorDefault);
     });
     
     CFRunLoopRef runloop = CFRunLoopGetCurrent();
@@ -196,8 +200,69 @@ static void runLoopSourceCallback(void *info) {
 
 @end
 
+#if AS_KDEBUG_ENABLE
+/**
+ * This is real, private CA API. Valid as of iOS 10.
+ */
+typedef enum {
+  kCATransactionPhasePreLayout,
+  kCATransactionPhasePreCommit,
+  kCATransactionPhasePostCommit,
+} CATransactionPhase;
+
+@interface CATransaction (Private)
++ (void)addCommitHandler:(void(^)(void))block forPhase:(CATransactionPhase)phase;
++ (int)currentState;
+@end
+#endif
+
 @implementation ASRunLoopQueue
 
+#if AS_KDEBUG_ENABLE
++ (void)load
+{
+  [self registerCATransactionObservers];
+}
+
++ (void)registerCATransactionObservers
+{
+  static BOOL privateCAMethodsExist;
+  static dispatch_block_t preLayoutHandler;
+  static dispatch_block_t preCommitHandler;
+  static dispatch_block_t postCommitHandler;
+  static dispatch_once_t onceToken;
+  dispatch_once(&onceToken, ^{
+    privateCAMethodsExist = [CATransaction respondsToSelector:@selector(addCommitHandler:forPhase:)];
+    privateCAMethodsExist &= [CATransaction respondsToSelector:@selector(currentState)];
+    if (!privateCAMethodsExist) {
+      NSLog(@"Private CA methods are gone.");
+    }
+    preLayoutHandler = ^{
+      ASSignpostStartCustom(ASSignpostCATransactionLayout, 0, [CATransaction currentState]);
+    };
+    preCommitHandler = ^{
+      int state = [CATransaction currentState];
+      ASSignpostEndCustom(ASSignpostCATransactionLayout, 0, state, ASSignpostColorDefault);
+      ASSignpostStartCustom(ASSignpostCATransactionCommit, 0, state);
+    };
+    postCommitHandler = ^{
+      ASSignpostEndCustom(ASSignpostCATransactionCommit, 0, [CATransaction currentState], ASSignpostColorDefault);
+      // Can't add new observers inside an observer. rdar://problem/31253952
+      dispatch_async(dispatch_get_main_queue(), ^{
+        [self registerCATransactionObservers];
+      });
+    };
+  });
+
+  if (privateCAMethodsExist) {
+    [CATransaction addCommitHandler:preLayoutHandler forPhase:kCATransactionPhasePreLayout];
+    [CATransaction addCommitHandler:preCommitHandler forPhase:kCATransactionPhasePreCommit];
+    [CATransaction addCommitHandler:postCommitHandler forPhase:kCATransactionPhasePostCommit];
+  }
+}
+
+#endif // AS_KDEBUG_ENABLE
+
 - (instancetype)initWithRunLoop:(CFRunLoopRef)runloop retainObjects:(BOOL)retainsObjects handler:(void (^)(id _Nullable, BOOL))handlerBlock
 {
   if (self = [super init]) {
@@ -275,7 +340,7 @@ static void runLoopSourceCallback(void *info) {
       return;
     }
     
-    ASProfilingSignpostStart(0, self);
+    ASSignpostStart(ASSignpostRunLoopQueueBatch);
 
     // Snatch the next batch of items.
     NSInteger maxCountToProcess = MIN(internalQueueCount, self.batchSize);
@@ -329,7 +394,7 @@ static void runLoopSourceCallback(void *info) {
     CFRunLoopWakeUp(_runLoop);
   }
   
-  ASProfilingSignpostEnd(0, self);
+  ASSignpostEnd(ASSignpostRunLoopQueueBatch);
 }
 
 - (void)enqueue:(id)object
diff --git a/Source/Base/ASAssert.m b/Source/Base/ASAssert.m
index b52f2f4b3b..7759ff53f0 100644
--- a/Source/Base/ASAssert.m
+++ b/Source/Base/ASAssert.m
@@ -13,15 +13,9 @@
 #import <AsyncDisplayKit/ASAssert.h>
 #import <Foundation/Foundation.h>
 
-// pthread_key_create must be called before the key can be used. This function does that.
 static pthread_key_t ASMainThreadAssertionsDisabledKey()
 {
-  static pthread_key_t ASMainThreadAssertionsDisabledKey;
-  static dispatch_once_t onceToken;
-  dispatch_once(&onceToken, ^{
-    pthread_key_create(&ASMainThreadAssertionsDisabledKey, NULL);
-  });
-  return ASMainThreadAssertionsDisabledKey;
+  return ASPthreadStaticKey(NULL);
 }
 
 BOOL ASMainThreadAssertionsAreDisabled() {
diff --git a/Source/Base/ASBaseDefines.h b/Source/Base/ASBaseDefines.h
index 2fedafdfa2..b269096f48 100755
--- a/Source/Base/ASBaseDefines.h
+++ b/Source/Base/ASBaseDefines.h
@@ -215,6 +215,24 @@
 #define AS_SUBCLASSING_RESTRICTED
 #endif
 
+#define ASPthreadStaticKey(dtor) ({ \
+  static dispatch_once_t onceToken; \
+  static pthread_key_t key; \
+  dispatch_once(&onceToken, ^{ \
+    pthread_key_create(&key, dtor); \
+  }); \
+  key; \
+})
+
+#define ASCreateOnce(expr) ({ \
+  static dispatch_once_t onceToken; \
+  static __typeof__(expr) staticVar; \
+  dispatch_once(&onceToken, ^{ \
+    staticVar = expr; \
+  }); \
+  staticVar; \
+})
+
 /// Ensure that class is of certain kind
 #define ASDynamicCast(x, c) ({ \
   id __val = x;\
diff --git a/Source/Base/ASLog.h b/Source/Base/ASLog.h
index 873702402f..ae734e0ba8 100644
--- a/Source/Base/ASLog.h
+++ b/Source/Base/ASLog.h
@@ -16,9 +16,45 @@
 //
 
 #import <AsyncDisplayKit/ASAvailability.h>
+#import <Foundation/Foundation.h>
 
-#pragma once
+/// The signposts we use. Signposts are grouped by color. The SystemTrace.tracetemplate file
+/// should be kept up-to-date with these values.
+typedef NS_ENUM(uint32_t, ASSignpostName) {
+  // Collection/Table (Blue)
+  ASSignpostDataControllerBatch = 300,		// Alloc/layout nodes before collection update.
+  ASSignpostRangeControllerUpdate,				// Ranges update pass.
+  ASSignpostCollectionUpdate,							// Entire update process, from -endUpdates to [super perform…]
 
+  // Rendering (Green)
+  ASSignpostLayerDisplay = 325,						// Client display callout.
+  ASSignpostRunLoopQueueBatch,						// One batch of ASRunLoopQueue.
+
+  // Layout (Purple)
+  ASSignpostCalculateLayout = 350,				// Start of calculateLayoutThatFits to end. Max 1 per thread.
+
+  // Misc (Orange)
+  ASSignpostDeallocQueueDrain = 375,			// One chunk of dealloc queue work. arg0 is count.
+  ASSignpostCATransactionLayout,					// The CA transaction commit layout phase.
+  ASSignpostCATransactionCommit						// The CA transaction commit post-layout phase.
+};
+
+typedef NS_ENUM(uintptr_t, ASSignpostColor) {
+  ASSignpostColorBlue,
+  ASSignpostColorGreen,
+  ASSignpostColorPurple,
+  ASSignpostColorOrange,
+  ASSignpostColorRed,
+  ASSignpostColorDefault
+};
+
+static inline ASSignpostColor ASSignpostGetColor(ASSignpostName name, ASSignpostColor colorPref) {
+  if (colorPref == ASSignpostColorDefault) {
+    return (ASSignpostColor)((name / 25) % 4);
+  } else {
+    return colorPref;
+  }
+}
 
 #define ASMultiplexImageNodeLogDebug(...)
 #define ASMultiplexImageNodeCLogDebug(...)
@@ -26,8 +62,9 @@
 #define ASMultiplexImageNodeLogError(...)
 #define ASMultiplexImageNodeCLogError(...)
 
-// Note: `<sys/kdebug_signpost.h>` only exists in Xcode 8 and later.
-#if defined(PROFILE) && __has_include(<sys/kdebug_signpost.h>)
+#define AS_KDEBUG_ENABLE defined(PROFILE) && __has_include(<sys/kdebug_signpost.h>)
+
+#if AS_KDEBUG_ENABLE
 
 #import <sys/kdebug_signpost.h>
 
@@ -45,21 +82,27 @@
 #define APPSDBG_CODE(SubClass,code) KDBG_CODE(DBG_APPS, SubClass, code)
 #endif
 
-#define ASProfilingSignpost(x) \
-  AS_AT_LEAST_IOS10 ? kdebug_signpost(x, 0, 0, 0, (uint32_t)(x % 4)) \
-                    : syscall(SYS_kdebug_trace, APPSDBG_CODE(DBG_MACH_CHUD, x) | DBG_FUNC_NONE, 0, 0, 0, (uint32_t)(x % 4));
+// Currently we'll reserve arg3.
+#define ASSignpost(name, identifier, arg2, color) \
+  AS_AT_LEAST_IOS10 ? kdebug_signpost(name, (uintptr_t)identifier, (uintptr_t)arg2, 0, ASSignpostGetColor(name, color)) \
+                    : syscall(SYS_kdebug_trace, APPSDBG_CODE(DBG_MACH_CHUD, name) | DBG_FUNC_NONE, (uintptr_t)identifier, (uintptr_t)arg2, 0, ASSignpostGetColor(name, color));
 
-#define ASProfilingSignpostStart(x, y) \
-  AS_AT_LEAST_IOS10 ? kdebug_signpost_start((uint32_t)x, (uintptr_t)y, 0, 0, (uint32_t)(x % 4)) \
-                    : syscall(SYS_kdebug_trace, APPSDBG_CODE(DBG_MACH_CHUD, x) | DBG_FUNC_START, (uintptr_t)y, 0, 0, (uint32_t)(x % 4));
+#define ASSignpostStartCustom(name, identifier, arg2) \
+  AS_AT_LEAST_IOS10 ? kdebug_signpost_start(name, (uintptr_t)identifier, (uintptr_t)arg2, 0, 0) \
+                    : syscall(SYS_kdebug_trace, APPSDBG_CODE(DBG_MACH_CHUD, name) | DBG_FUNC_START, (uintptr_t)identifier, (uintptr_t)arg2, 0, 0);
+#define ASSignpostStart(name) ASSignpostStartCustom(name, self, 0)
+
+#define ASSignpostEndCustom(name, identifier, arg2, color) \
+  AS_AT_LEAST_IOS10 ? kdebug_signpost_end(name, (uintptr_t)identifier, (uintptr_t)arg2, 0, ASSignpostGetColor(name, color)) \
+                    : syscall(SYS_kdebug_trace, APPSDBG_CODE(DBG_MACH_CHUD, name) | DBG_FUNC_END, (uintptr_t)identifier, (uintptr_t)arg2, 0, ASSignpostGetColor(name, color));
+#define ASSignpostEnd(name) ASSignpostEndCustom(name, self, 0, ASSignpostColorDefault)
 
-#define ASProfilingSignpostEnd(x, y) \
-  AS_AT_LEAST_IOS10 ? kdebug_signpost_end((uint32_t)x, (uintptr_t)y, 0, 0, (uint32_t)(x % 4)) \
-                    : syscall(SYS_kdebug_trace, APPSDBG_CODE(DBG_MACH_CHUD, x) | DBG_FUNC_END, (uintptr_t)y, 0, 0, (uint32_t)(x % 4));
 #else
 
-#define ASProfilingSignpost(x)
-#define ASProfilingSignpostStart(x, y)
-#define ASProfilingSignpostEnd(x, y)
+#define ASSignpost(name, identifier, arg2, color)
+#define ASSignpostStartCustom(name, identifier, arg2)
+#define ASSignpostStart(name)
+#define ASSignpostEndCustom(name, identifier, arg2, color)
+#define ASSignpostEnd(name)
 
 #endif
diff --git a/Source/Details/ASDataController.mm b/Source/Details/ASDataController.mm
index d2d5974ea3..a8cccd45ac 100644
--- a/Source/Details/ASDataController.mm
+++ b/Source/Details/ASDataController.mm
@@ -40,8 +40,6 @@
 //#define LOG(...) NSLog(__VA_ARGS__)
 #define LOG(...)
 
-#define AS_MEASURE_AVOIDED_DATACONTROLLER_WORK 0
-
 #define RETURN_IF_NO_DATASOURCE(val) if (_dataSource == nil) { return val; }
 #define ASSERT_ON_EDITING_QUEUE ASDisplayNodeAssertNotNil(dispatch_get_specific(&kASDataControllerEditingQueueKey), @"%@ must be called on the editing transaction queue.", NSStringFromSelector(_cmd))
 
@@ -54,13 +52,6 @@ NSString * const ASCollectionInvalidUpdateException = @"ASCollectionInvalidUpdat
 
 typedef void (^ASDataControllerCompletionBlock)(NSArray<ASCollectionElement *> *elements, NSArray<ASCellNode *> *nodes);
 
-#if AS_MEASURE_AVOIDED_DATACONTROLLER_WORK
-@interface ASDataController (AvoidedWorkMeasuring)
-+ (void)_didLayoutNode;
-+ (void)_expectToInsertNodes:(NSUInteger)count;
-@end
-#endif
-
 @interface ASDataController () {
   id<ASDataControllerLayoutDelegate> _layoutDelegate;
 
@@ -159,17 +150,14 @@ typedef void (^ASDataControllerCompletionBlock)(NSArray<ASCollectionElement *> *
 - (void)batchAllocateNodesFromElements:(NSArray<ASCollectionElement *> *)elements andLayout:(BOOL)shouldLayout batchSize:(NSInteger)batchSize batchCompletion:(ASDataControllerCompletionBlock)batchCompletionHandler
 {
   ASSERT_ON_EDITING_QUEUE;
-#if AS_MEASURE_AVOIDED_DATACONTROLLER_WORK
-    [ASDataController _expectToInsertNodes:elements.count];
-#endif
-  
+
   if (elements.count == 0 || _dataSource == nil) {
     batchCompletionHandler(@[], @[]);
     return;
   }
 
-  ASProfilingSignpostStart(2, _dataSource);
-  
+  ASSignpostStart(ASSignpostDataControllerBatch);
+
   if (batchSize == 0) {
     batchSize = [[ASDataController class] parallelProcessorCount] * kASDataControllerSizingCountPerProcessor;
   }
@@ -182,8 +170,8 @@ typedef void (^ASDataControllerCompletionBlock)(NSArray<ASCollectionElement *> *
     NSArray<ASCellNode *> *nodes = [self _allocateNodesFromElements:batchedElements andLayout:shouldLayout];
     batchCompletionHandler(batchedElements, nodes);
   }
-  
-  ASProfilingSignpostEnd(2, _dataSource);
+
+  ASSignpostEndCustom(ASSignpostDataControllerBatch, self, 0, (_dataSource != nil ? ASSignpostColorDefault : ASSignpostColorRed));
 }
 
 /**
@@ -228,10 +216,6 @@ typedef void (^ASDataControllerCompletionBlock)(NSArray<ASCollectionElement *> *
       if (ASSizeRangeHasSignificantArea(sizeRange)) {
         [self _layoutNode:node withConstrainedSize:sizeRange];
       }
-
-#if AS_MEASURE_AVOIDED_DATACONTROLLER_WORK
-      [ASDataController _didLayoutNode];
-#endif
     }
 
     allocatedNodeBuffer[i] = node;
@@ -836,27 +820,3 @@ typedef void (^ASDataControllerCompletionBlock)(NSArray<ASCollectionElement *> *
 }
 
 @end
-
-#if AS_MEASURE_AVOIDED_DATACONTROLLER_WORK
-
-static volatile int64_t _totalExpectedItems = 0;
-static volatile int64_t _totalMeasuredNodes = 0;
-
-@implementation ASDataController (WorkMeasuring)
-
-+ (void)_didLayoutNode
-{
-    int64_t measured = OSAtomicIncrement64(&_totalMeasuredNodes);
-    int64_t expected = _totalExpectedItems;
-    if (measured % 20 == 0 || measured == expected) {
-        NSLog(@"Data controller avoided work (underestimated): %lld / %lld", measured, expected);
-    }
-}
-
-+ (void)_expectToInsertNodes:(NSUInteger)count
-{
-    OSAtomicAdd64((int64_t)count, &_totalExpectedItems);
-}
-
-@end
-#endif
diff --git a/Source/Details/ASRangeController.mm b/Source/Details/ASRangeController.mm
index 700b38fdb3..cf0acaab6e 100644
--- a/Source/Details/ASRangeController.mm
+++ b/Source/Details/ASRangeController.mm
@@ -223,7 +223,7 @@ static UIApplicationState __ApplicationState = UIApplicationStateActive;
     [self _setVisibleNodes:newVisibleNodes];
     return; // don't do anything for this update, but leave _rangeIsValid == NO to make sure we update it later
   }
-  ASProfilingSignpostStart(1, self);
+  ASSignpostStart(ASSignpostRangeControllerUpdate);
 
   // Get the scroll direction. Default to using the previous one, if they're not scrolling.
   ASScrollDirection scrollDirection = [_dataSource scrollDirectionForRangeController:self];
@@ -412,7 +412,7 @@ static UIApplicationState __ApplicationState = UIApplicationStateActive;
   NSLog(@"Range update complete; modifiedIndexPaths: %@", [self descriptionWithIndexPaths:modifiedIndexPaths]);
 #endif
   
-  ASProfilingSignpostEnd(1, self);
+  ASSignpostEnd(ASSignpostRangeControllerUpdate);
 }
 
 #pragma mark - Notification observers
diff --git a/Source/Details/ASThread.h b/Source/Details/ASThread.h
index 2c30cf501b..ca049d72a4 100644
--- a/Source/Details/ASThread.h
+++ b/Source/Details/ASThread.h
@@ -22,8 +22,6 @@
 #import <stdbool.h>
 #import <stdlib.h>
 
-#import <libkern/OSAtomic.h>
-
 #import <AsyncDisplayKit/ASAssert.h>
 #import <AsyncDisplayKit/ASBaseDefines.h>
 
diff --git a/Source/Details/Transactions/_ASAsyncTransaction.mm b/Source/Details/Transactions/_ASAsyncTransaction.mm
index 0294a1013f..a7c25b9487 100644
--- a/Source/Details/Transactions/_ASAsyncTransaction.mm
+++ b/Source/Details/Transactions/_ASAsyncTransaction.mm
@@ -21,12 +21,10 @@
 #import <AsyncDisplayKit/_ASAsyncTransaction.h>
 #import <AsyncDisplayKit/_ASAsyncTransactionGroup.h>
 #import <AsyncDisplayKit/ASAssert.h>
-#import <AsyncDisplayKit/ASLog.h>
 #import <AsyncDisplayKit/ASThread.h>
 #import <list>
 #import <map>
 #import <mutex>
-#import <stdatomic.h>
 
 #define ASAsyncTransactionAssertMainThread() NSAssert(0 != pthread_main_np(), @"This method must be called on the main thread");
 
@@ -254,9 +252,7 @@ void ASAsyncTransactionQueue::GroupImpl::schedule(NSInteger priority, dispatch_q
         Operation operation = entry.popNextOperation(respectPriority);
         lock.unlock();
         if (operation._block) {
-          ASProfilingSignpostStart(3, operation._block);
           operation._block();
-          ASProfilingSignpostEnd(3, operation._block);
         }
         operation._group->leave();
         operation._block = nil; // the block must be freed while mutex is unlocked
diff --git a/Source/Layout/ASLayoutElement.mm b/Source/Layout/ASLayoutElement.mm
index c8ad2d379f..8d647c09aa 100644
--- a/Source/Layout/ASLayoutElement.mm
+++ b/Source/Layout/ASLayoutElement.mm
@@ -50,8 +50,6 @@ CGSize const ASLayoutElementParentSizeUndefined = {ASLayoutElementParentDimensio
 int32_t const ASLayoutElementContextInvalidTransitionID = 0;
 int32_t const ASLayoutElementContextDefaultTransitionID = ASLayoutElementContextInvalidTransitionID + 1;
 
-pthread_key_t ASLayoutElementContextKey;
-
 static void ASLayoutElementDestructor(void *p) {
   if (p != NULL) {
     ASDisplayNodeCFailAssert(@"Thread exited without clearing layout element context!");
@@ -59,36 +57,31 @@ static void ASLayoutElementDestructor(void *p) {
   }
 };
 
-// pthread_key_create must be called before the key can be used. This function does that.
-void ASLayoutElementContextEnsureKey()
+pthread_key_t ASLayoutElementContextKey()
 {
-  static dispatch_once_t onceToken;
-  dispatch_once(&onceToken, ^{
-    pthread_key_create(&ASLayoutElementContextKey, ASLayoutElementDestructor);
-  });
+  return ASPthreadStaticKey(ASLayoutElementDestructor);
 }
 
 void ASLayoutElementPushContext(ASLayoutElementContext *context)
 {
-  ASLayoutElementContextEnsureKey();
   // NOTE: It would be easy to support nested contexts – just use an NSMutableArray here.
   ASDisplayNodeCAssertNil(ASLayoutElementGetCurrentContext(), @"Nested ASLayoutElementContexts aren't supported.");
-  pthread_setspecific(ASLayoutElementContextKey, CFBridgingRetain(context));
+  pthread_setspecific(ASLayoutElementContextKey(), CFBridgingRetain(context));
 }
 
 ASLayoutElementContext *ASLayoutElementGetCurrentContext()
 {
-  ASLayoutElementContextEnsureKey();
   // Don't retain here. Caller will retain if it wants to!
-  return (__bridge __unsafe_unretained ASLayoutElementContext *)pthread_getspecific(ASLayoutElementContextKey);
+  return (__bridge __unsafe_unretained ASLayoutElementContext *)pthread_getspecific(ASLayoutElementContextKey());
 }
 
 void ASLayoutElementPopContext()
 {
-  ASLayoutElementContextEnsureKey();
+  ASLayoutElementContextKey();
   ASDisplayNodeCAssertNotNil(ASLayoutElementGetCurrentContext(), @"Attempt to pop context when there wasn't a context!");
-  CFBridgingRelease(pthread_getspecific(ASLayoutElementContextKey));
-  pthread_setspecific(ASLayoutElementContextKey, NULL);
+  auto key = ASLayoutElementContextKey();
+  CFBridgingRelease(pthread_getspecific(key));
+  pthread_setspecific(key, NULL);
 }
 
 #pragma mark - ASLayoutElementStyle
diff --git a/Source/Private/ASDisplayNode+AsyncDisplay.mm b/Source/Private/ASDisplayNode+AsyncDisplay.mm
index 39d8f59b6b..7c9c39ef03 100644
--- a/Source/Private/ASDisplayNode+AsyncDisplay.mm
+++ b/Source/Private/ASDisplayNode+AsyncDisplay.mm
@@ -272,6 +272,20 @@
     };
   }
 
+  /**
+   If we're profiling, wrap the display block with signpost start and end.
+   Color the interval red if cancelled, green otherwise.
+   */
+#if AS_KDEBUG_ENABLE
+  __unsafe_unretained id ptrSelf = self;
+  displayBlock = ^{
+    ASSignpostStartCustom(ASSignpostLayerDisplay, ptrSelf, 0);
+    id result = displayBlock();
+    ASSignpostEndCustom(ASSignpostLayerDisplay, ptrSelf, 0, isCancelledBlock() ? ASSignpostColorRed : ASSignpostColorGreen);
+    return result;
+  };
+#endif
+
   return displayBlock;
 }
 
diff --git a/Source/Private/TextExperiment/Component/ASTextDebugOption.m b/Source/Private/TextExperiment/Component/ASTextDebugOption.m
index fe36f250ed..e823d328b1 100755
--- a/Source/Private/TextExperiment/Component/ASTextDebugOption.m
+++ b/Source/Private/TextExperiment/Component/ASTextDebugOption.m
@@ -10,7 +10,6 @@
 //
 
 #import "ASTextDebugOption.h"
-#import <libkern/OSAtomic.h>
 #import <pthread.h>
 
 static pthread_mutex_t _sharedDebugLock;
diff --git a/Tests/ASTableViewThrashTests.m b/Tests/ASTableViewThrashTests.m
index 34326629ed..e547fe39cb 100644
--- a/Tests/ASTableViewThrashTests.m
+++ b/Tests/ASTableViewThrashTests.m
@@ -2,14 +2,24 @@
 //  ASTableViewThrashTests.m
 //  Texture
 //
-//  Created by Adlai Holler on 6/21/16.
-//  Copyright © 2016 Facebook. All rights reserved.
+//  Copyright (c) 2014-present, Facebook, Inc.  All rights reserved.
+//  This source code is licensed under the BSD-style license found in the
+//  LICENSE file in the /ASDK-Licenses directory of this source tree. An additional
+//  grant of patent rights can be found in the PATENTS file in the same directory.
+//
+//  Modifications to this file made after 4/13/2017 are: Copyright (c) 2017-present,
+//  Pinterest, Inc.  Licensed under the Apache License, Version 2.0 (the "License");
+//  you may not use this file except in compliance with the License.
+//  You may obtain a copy of the License at
+//
+//      http://www.apache.org/licenses/LICENSE-2.0
 //
 
 #import <XCTest/XCTest.h>
 #import <AsyncDisplayKit/AsyncDisplayKit.h>
 #import <AsyncDisplayKit/ASTableViewInternal.h>
 #import <AsyncDisplayKit/ASTableView+Undeprecated.h>
+#import <stdatomic.h>
 
 
 // Set to 1 to use UITableView and see if the issue still exists.
@@ -40,7 +50,7 @@ static NSString *ASThrashArrayDescription(NSArray *array) {
   return str;
 }
 
-static volatile int32_t ASThrashTestItemNextID = 1;
+static atomic_uint ASThrashTestItemNextID;
 @interface ASThrashTestItem: NSObject <NSSecureCoding>
 @property (nonatomic, readonly) NSInteger itemID;
 
@@ -56,7 +66,7 @@ static volatile int32_t ASThrashTestItemNextID = 1;
 - (instancetype)init {
   self = [super init];
   if (self != nil) {
-    _itemID = OSAtomicIncrement32(&ASThrashTestItemNextID);
+    _itemID = atomic_fetch_add(&ASThrashTestItemNextID, 1);
   }
   return self;
 }
@@ -99,7 +109,7 @@ static volatile int32_t ASThrashTestItemNextID = 1;
 - (CGFloat)headerHeight;
 @end
 
-static volatile int32_t ASThrashTestSectionNextID = 1;
+static atomic_uint ASThrashTestSectionNextID = 1;
 @implementation ASThrashTestSection
 
 /// Create an array of sections with the given count
@@ -114,7 +124,7 @@ static volatile int32_t ASThrashTestSectionNextID = 1;
 - (instancetype)initWithCount:(NSInteger)count {
   self = [super init];
   if (self != nil) {
-    _sectionID = OSAtomicIncrement32(&ASThrashTestSectionNextID);
+    _sectionID = atomic_fetch_add(&ASThrashTestSectionNextID, 1);
     _items = [ASThrashTestItem itemsWithCount:count];
   }
   return self;