Ship ASExperimentalOOMBackgroundDeallocDisable since it decreases OOMs

Source/ASCollectionView.mm

@@ -331,12 +331,6 @@ - (void)dealloc
     [self setAsyncDelegate:nil];
     [self setAsyncDataSource:nil];
   }
-
-  // Data controller & range controller may own a ton of nodes, let's deallocate those off-main.
-  if (ASActivateExperimentalFeature(ASExperimentalOOMBackgroundDeallocDisable) == NO) {
-    ASPerformBackgroundDeallocation(&_dataController);
-    ASPerformBackgroundDeallocation(&_rangeController);
-  }
 }
 
 #pragma mark -

Source/ASExperimentalFeatures.h

@@ -27,11 +27,10 @@ typedef NS_OPTIONS(NSUInteger, ASExperimentalFeatures) {
   ASExperimentalSkipClearData = 1 << 6,                                     // exp_skip_clear_data
   ASExperimentalDidEnterPreloadSkipASMLayout = 1 << 7,                      // exp_did_enter_preload_skip_asm_layout
   ASExperimentalDispatchApply = 1 << 8,                                     // exp_dispatch_apply
-  ASExperimentalOOMBackgroundDeallocDisable = 1 << 9,                       // exp_oom_bg_dealloc_disable
-  ASExperimentalDrawingGlobal = 1 << 10,                                    // exp_drawing_global
-  ASExperimentalOptimizeDataControllerPipeline = 1 << 11,                   // exp_optimize_data_controller_pipeline
-  ASExperimentalTraitCollectionDidChangeWithPreviousCollection = 1 << 12,   // exp_trait_collection_did_change_with_previous_collection
-  ASExperimentalDoNotCacheAccessibilityElements = 1 << 13,                  // exp_do_not_cache_accessibility_elements
+  ASExperimentalDrawingGlobal = 1 << 9,                                     // exp_drawing_global
+  ASExperimentalOptimizeDataControllerPipeline = 1 << 10,                   // exp_optimize_data_controller_pipeline
+  ASExperimentalTraitCollectionDidChangeWithPreviousCollection = 1 << 11,   // exp_trait_collection_did_change_with_previous_collection
+  ASExperimentalDoNotCacheAccessibilityElements = 1 << 12,                  // exp_do_not_cache_accessibility_elements
   ASExperimentalFeatureAll = 0xFFFFFFFF
 };
 

Source/ASExperimentalFeatures.mm

@@ -21,7 +21,6 @@
                                       @"exp_skip_clear_data",
                                       @"exp_did_enter_preload_skip_asm_layout",
                                       @"exp_dispatch_apply",
-                                      @"exp_oom_bg_dealloc_disable",
                                       @"exp_drawing_global",
                                       @"exp_optimize_data_controller_pipeline",
                                       @"exp_trait_collection_did_change_with_previous_collection",

Source/ASImageNode+AnimatedImage.mm

@@ -79,11 +79,6 @@ - (void)_locked_setAnimatedImage:(id <ASAnimatedImageProtocol>)animatedImage
   // not fire e.g. while scrolling down
   CFRunLoopPerformBlock(CFRunLoopGetCurrent(), kCFRunLoopCommonModes, ^(void) {
     [self animatedImageSet:animatedImage previousAnimatedImage:previousAnimatedImage];
-
-    // Animated image can take while to dealloc, do it off the main queue
-    if (previousAnimatedImage != nil && ASActivateExperimentalFeature(ASExperimentalOOMBackgroundDeallocDisable) == NO) {
-      ASPerformBackgroundDeallocation(&previousAnimatedImage);
-    }
   });
   // Don't need to wakeup the runloop as the current is already running
   // CFRunLoopWakeUp(runLoop); // Should not be necessary

Source/ASImageNode.mm

@@ -30,8 +30,6 @@
 // TODO: It would be nice to remove this dependency; it's the only subclass using more than +FrameworkSubclasses.h
 #import <AsyncDisplayKit/ASDisplayNodeInternal.h>
 
-static const CGSize kMinReleaseImageOnBackgroundSize = {20.0, 20.0};
-
 typedef void (^ASImageNodeDrawParametersBlock)(ASWeakMapEntry *entry);
 
 @interface ASImageNodeDrawParameters : NSObject {
@@ -247,7 +245,6 @@ - (void)_locked_setImage:(UIImage *)image
     return;
   }
 
-  UIImage *oldImage = _image;
   _image = image;
 
   if (image != nil) {
@@ -268,16 +265,6 @@ - (void)_locked_setImage:(UIImage *)image
   } else {
     self.contents = nil;
   }
-
-  // Destruction of bigger images on the main thread can be expensive
-  // and can take some time, so we dispatch onto a bg queue to
-  // actually dealloc.
-  CGSize oldImageSize = oldImage.size;
-  BOOL shouldReleaseImageOnBackgroundThread = oldImageSize.width > kMinReleaseImageOnBackgroundSize.width
-                                              || oldImageSize.height > kMinReleaseImageOnBackgroundSize.height;
-  if (shouldReleaseImageOnBackgroundThread && ASActivateExperimentalFeature(ASExperimentalOOMBackgroundDeallocDisable) == NO) {
-    ASPerformBackgroundDeallocation(&oldImage);
-  }
 }
 
 - (UIImage *)image

Source/ASMultiplexImageNode.mm

@@ -39,8 +39,6 @@
 static NSString *const kAssetsLibraryURLScheme = @"assets-library";
 #endif
 
-static const CGSize kMinReleaseImageOnBackgroundSize = {20.0, 20.0};
-
 /**
   @abstract Signature for the block to be performed after an image has loaded.
   @param image The image that was loaded, or nil if no image was loaded.
@@ -533,17 +531,7 @@ - (void)_updateProgressImageBlockOnDownloaderIfNeeded
 
 - (void)_clearImage
 {
-  // Destruction of bigger images on the main thread can be expensive
-  // and can take some time, so we dispatch onto a bg queue to
-  // actually dealloc.
-  UIImage *image = self.image;
-  CGSize imageSize = image.size;
-  BOOL shouldReleaseImageOnBackgroundThread = imageSize.width > kMinReleaseImageOnBackgroundSize.width ||
-  imageSize.height > kMinReleaseImageOnBackgroundSize.height;
   [self _setImage:nil];
-  if (shouldReleaseImageOnBackgroundThread && ASActivateExperimentalFeature(ASExperimentalOOMBackgroundDeallocDisable) == NO) {
-    ASPerformBackgroundDeallocation(&image);
-  }
 }
 
 #pragma mark -

Source/ASTableView.mm

@@ -373,12 +373,6 @@ - (void)dealloc
     [self setAsyncDelegate:nil];
     [self setAsyncDataSource:nil];
   }
-
-  // Data controller & range controller may own a ton of nodes, let's deallocate those off-main
-  if (ASActivateExperimentalFeature(ASExperimentalOOMBackgroundDeallocDisable) == NO) {
-    ASPerformBackgroundDeallocation(&_dataController);
-    ASPerformBackgroundDeallocation(&_rangeController);
-  }
 }
 
 #pragma mark -

Source/ASViewController.mm

@@ -105,14 +105,6 @@ - (void)_initializeInstance
   }
 }
 
-- (void)dealloc
-{
-  if (ASActivateExperimentalFeature(ASExperimentalOOMBackgroundDeallocDisable)) {
-    return;
-  }
-  ASPerformBackgroundDeallocation(&_node);
-}
-
 - (void)loadView
 {
   // Apple applies a frame and autoresizing masks we need.  Allocating a view is not

Tests/ASConfigurationTests.mm

@@ -27,7 +27,6 @@
   ASExperimentalSkipClearData,
   ASExperimentalDidEnterPreloadSkipASMLayout,
   ASExperimentalDispatchApply,
-  ASExperimentalOOMBackgroundDeallocDisable,
   ASExperimentalDrawingGlobal,
   ASExperimentalOptimizeDataControllerPipeline,
   ASExperimentalTraitCollectionDidChangeWithPreviousCollection,
@@ -53,7 +52,6 @@ + (NSArray *)names {
     @"exp_skip_clear_data",
     @"exp_did_enter_preload_skip_asm_layout",
     @"exp_dispatch_apply",
-    @"exp_oom_bg_dealloc_disable",
     @"exp_drawing_global",
     @"exp_optimize_data_controller_pipeline",
     @"exp_trait_collection_did_change_with_previous_collection",