Add partitionsOutOfMemoryUsingXXX to know Blink memory usage from OOM crash reports

Source/wtf/Partitions.cpp

Index: Source/wtf/Partitions.cpp
diff --git a/Source/wtf/Partitions.cpp b/Source/wtf/Partitions.cpp
index 1e996bc045488a6ebb09f4e6c1c97630cb18f50c..d3d295b784c84d244723b62dc03a2659cb01d92c 100644
--- a/Source/wtf/Partitions.cpp
+++ b/Source/wtf/Partitions.cpp
@@ -31,6 +31,7 @@
 #include "config.h"
 #include "wtf/Partitions.h"
 
+#include "wtf/Alias.h"
 #include "wtf/DefaultAllocator.h"
 #include "wtf/FastMalloc.h"
 #include "wtf/MainThread.h"
@@ -51,6 +52,7 @@ void Partitions::initialize()
     spinLockLock(&s_initializationLock);
 
     if (!s_initialized) {
+        partitionAllocGlobalInit(&Partitions::handleOutOfMemory);
         m_fastMallocAllocator.init();
         m_bufferAllocator.init();
         m_nodeAllocator.init();
@@ -122,4 +124,90 @@ void Partitions::dumpMemoryStats(bool isLightDump, PartitionStatsDumper* partiti
     partitionDumpStats(layoutPartition(), "layout_partition", isLightDump, partitionStatsDumper);
 }
 
+static NEVER_INLINE void partitionsOutOfMemoryUsing2G()
+{
+    size_t signature = 2UL * 1024 * 1024 * 1024;
+    alias(&signature);
+    IMMEDIATE_CRASH();
+}
+
+static NEVER_INLINE void partitionsOutOfMemoryUsing1G()
+{
+    size_t signature = 1UL * 1024 * 1024 * 1024;
+    alias(&signature);
+    IMMEDIATE_CRASH();
+}
+
+static NEVER_INLINE void partitionsOutOfMemoryUsing512M()
+{
+    size_t signature = 512 * 1024 * 1024;
+    alias(&signature);
+    IMMEDIATE_CRASH();
+}
+
+static NEVER_INLINE void partitionsOutOfMemoryUsing256M()
+{
+    size_t signature = 256 * 1024 * 1024;
+    alias(&signature);
+    IMMEDIATE_CRASH();
+}
+
+static NEVER_INLINE void partitionsOutOfMemoryUsing128M()
+{
+    size_t signature = 128 * 1024 * 1024;
+    alias(&signature);
+    IMMEDIATE_CRASH();
+}
+
+static NEVER_INLINE void partitionsOutOfMemoryUsing64M()
+{
+    size_t signature = 64 * 1024 * 1024;
+    alias(&signature);
+    IMMEDIATE_CRASH();
+}
+
+static NEVER_INLINE void partitionsOutOfMemoryUsing32M()
+{
+    size_t signature = 32 * 1024 * 1024;
+    alias(&signature);
+    IMMEDIATE_CRASH();
+}
+
+static NEVER_INLINE void partitionsOutOfMemoryUsing16M()
+{
+    size_t signature = 16 * 1024 * 1024;
+    alias(&signature);
+    IMMEDIATE_CRASH();
+}
+
+static NEVER_INLINE void partitionsOutOfMemoryUsingLessThan16M()
+{
+    size_t signature = 16 * 1024 * 1024 - 1;
+    alias(&signature);
+    IMMEDIATE_CRASH();
+}
+
+void Partitions::handleOutOfMemory()
+{
+    volatile size_t totalUsage = totalSizeOfCommittedPages();
+
+    if (totalUsage >= 2UL * 1024 * 1024 * 1024)
+        partitionsOutOfMemoryUsing2G();
+    if (totalUsage >= 1UL * 1024 * 1024 * 1024)
+        partitionsOutOfMemoryUsing1G();
+    if (totalUsage >= 512 * 1024 * 1024)
+        partitionsOutOfMemoryUsing512M();
+    if (totalUsage >= 256 * 1024 * 1024)
+        partitionsOutOfMemoryUsing256M();
+    if (totalUsage >= 128 * 1024 * 1024)
+        partitionsOutOfMemoryUsing128M();
+    if (totalUsage >= 64 * 1024 * 1024)
+        partitionsOutOfMemoryUsing64M();
+    if (totalUsage >= 32 * 1024 * 1024)
+        partitionsOutOfMemoryUsing32M();
+    if (totalUsage >= 16 * 1024 * 1024)
+        partitionsOutOfMemoryUsing16M();
+    partitionsOutOfMemoryUsingLessThan16M();
+}
+
 } // namespace WTF