[Experiment] purge-and-suspend

third_party/WebKit/Source/core/dom/MemoryCoordinator.cpp

Index: third_party/WebKit/Source/core/dom/MemoryCoordinator.cpp
diff --git a/third_party/WebKit/Source/core/dom/MemoryCoordinator.cpp b/third_party/WebKit/Source/core/dom/MemoryCoordinator.cpp
index 745d979f619014d132f3afd30088efb834717643..d951dd87e92fa0d457a31e2f228f41aaffa8b505 100644
--- a/third_party/WebKit/Source/core/dom/MemoryCoordinator.cpp
+++ b/third_party/WebKit/Source/core/dom/MemoryCoordinator.cpp
@@ -4,11 +4,15 @@
 
 #include "core/dom/MemoryCoordinator.h"
 
+#include "bindings/core/v8/V8PerIsolateData.h"
 #include "core/fetch/MemoryCache.h"
+#include "core/page/Page.h"
+#include "core/paint/InlineTextBoxPainter.h"
 #include "platform/TraceEvent.h"
 #include "platform/fonts/FontCache.h"
 #include "platform/graphics/ImageDecodingStore.h"
 #include "platform/heap/Heap.h"
+#include "platform/text/CompressibleString.h"
 #include "wtf/allocator/Partitions.h"
 
 namespace blink {
@@ -30,13 +34,21 @@ MemoryCoordinator::~MemoryCoordinator()
 void MemoryCoordinator::onMemoryPressure(WebMemoryPressureLevel level)
 {
     TRACE_EVENT0("blink", "MemoryCoordinator::onMemoryPressure");
+
     if (level == WebMemoryPressureLevelCritical) {
         // Clear the image cache.
         ImageDecodingStore::instance().clear();
+        memoryCache()->pruneAll();

[esprehn, 2016/08/05 23:00:57]

Would it be possible to independently hook up these sub systems instead of
making this one know about every feature in the engine?

[tasak, 2016/08/08 04:47:36]

Acknowledged.

+        InlineTextBoxPainter::invalidateTextBlobCache();
+        Page::onMemoryPressure();
+        FontCache::fontCache()->invalidateShapeCache();
         FontCache::fontCache()->invalidate();
+        V8PerIsolateData::purgeMemory();
+        CompressibleStringImpl::compressAll();

[esprehn, 2016/08/05 23:00:58]

hmm without suspend doing this is pretty bad, it means v8 is going to cause them
to uncompress really soon. Did we solve that yet?

[tasak, 2016/08/08 04:47:36]

Acknowledged.

+    } else {

[esprehn, 2016/08/05 23:00:57]

else if

[tasak, 2016/08/08 04:47:36]

Acknowledged.

+        if (ProcessHeap::isLowEndDevice())
+            memoryCache()->pruneAll();
     }
-    if (ProcessHeap::isLowEndDevice())
-        memoryCache()->pruneAll();
     WTF::Partitions::decommitFreeableMemory();
 }