tracing: Report ResourceClients and the reason for not deletable for web-caches

third_party/WebKit/Source/core/fetch/Resource.cpp

 /*
     Copyright (C) 1998 Lars Knoll (knoll@mpi-hd.mpg.de)
     Copyright (C) 2001 Dirk Mueller (mueller@kde.org)
     Copyright (C) 2002 Waldo Bastian (bastian@kde.org)
     Copyright (C) 2006 Samuel Weinig (sam.weinig@gmail.com)
     Copyright (C) 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2011 Apple Inc. All rights reserved.
 
     This library is free software; you can redistribute it and/or
     modify it under the terms of the GNU Library General Public
     License as published by the Free Software Foundation; either
@@ skipping 494 matching lines @@
     if (cacheType == CachedMetadataHandler::SendToPlatform)
         Platform::current()->cacheMetadata(m_response.url(), m_response.responseTime(), 0, 0);
 }
 
 bool Resource::canDelete() const
 {
     return !hasClients() && !m_loader && !m_preloadCount && hasRightHandleCountApartFromCache(0)
         && !m_protectorCount;
 }
 
+String Resource::reasonNotDeletable() const
+{
+    StringBuilder builder;
+    if (hasClients()) {
+        builder.append("hasClients(");
+        builder.appendNumber(m_clients.size());
+        if (!m_clientsAwaitingCallback.isEmpty()) {
+            builder.append(", AwaitingCallback=");
+            builder.appendNumber(m_clientsAwaitingCallback.size());
+        }
+        if (!m_finishedClients.isEmpty()) {
+            builder.append(", Finished=");
+            builder.appendNumber(m_finishedClients.size());
+        }
+        builder.append(")");
+    }
+    if (m_loader) {
+        if (!builder.isEmpty())
+            builder.append(' ');
+        builder.append("m_loader");
+    }
+    if (m_preloadCount) {
+        if (!builder.isEmpty())
+            builder.append(' ');
+        builder.append("m_preloadCount(");
+        builder.appendNumber(m_preloadCount);
+        builder.append(")");
+    }
+    if (!hasRightHandleCountApartFromCache(0)) {
+        if (!builder.isEmpty())
+            builder.append(' ');
+        builder.append("m_handleCount(");
+        builder.appendNumber(m_handleCount);
+        builder.append(")");
+    }
+    if (m_protectorCount) {
+        if (!builder.isEmpty())
+            builder.append(' ');
+        builder.append("m_protectorCount(");
+        builder.appendNumber(m_protectorCount);
+        builder.append(")");
+    }
+    if (memoryCache()->contains(this)) {
+        if (!builder.isEmpty())
+            builder.append(' ');
+        builder.append("in_memory_cache");
+    }
+    return builder.toString();
+}
+
 bool Resource::hasOneHandle() const
 {
     return hasRightHandleCountApartFromCache(1);
 }
 
 CachedMetadata* Resource::cachedMetadata(unsigned dataTypeID) const
 {
     if (!m_cachedMetadata || m_cachedMetadata->dataTypeID() != dataTypeID)
         return nullptr;
     return m_cachedMetadata.get();
@@ skipping 197 matching lines @@
 
 void Resource::prune()
 {
     destroyDecodedDataIfPossible();
     unlock();
 }
 
 void Resource::onMemoryDump(WebMemoryDumpLevelOfDetail levelOfDetail, WebProcessMemoryDump* memoryDump) const
 {
     static const size_t kMaxURLReportLength = 128;
+    static const int kMaxResourceClientToShowInMemoryInfra = 10;
 
     const String dumpName = getMemoryDumpName();
     WebMemoryAllocatorDump* dump = memoryDump->createMemoryAllocatorDump(dumpName);
     dump->addScalar("encoded_size", "bytes", m_encodedSize);
     if (canDelete()) {
         dump->addScalar("dead_size", "bytes", m_encodedSize);
     } else {
         dump->addScalar("live_size", "bytes", m_encodedSize);
     }
 
     if (m_data) {
         dump->addScalar("purgeable_size", "bytes", isPurgeable() && !wasPurged() ? encodedSize() + overheadSize() : 0);
         m_data->onMemoryDump(dumpName, memoryDump);
     }
 
     if (levelOfDetail == WebMemoryDumpLevelOfDetail::Detailed) {
         String urlToReport = url().string();
         if (urlToReport.length() > kMaxURLReportLength) {
             urlToReport.truncate(kMaxURLReportLength);
             urlToReport = urlToReport + "...";
         }
         dump->addString("url", "", urlToReport);
+
+        dump->addString("reason_not_deletable", "", reasonNotDeletable());
+
+        Vector<String> clientNames;
+        ResourceClientWalker<ResourceClient> w(m_clients);

[haraken, 2015/11/09 23:30:20]

w => walker

[hiroshige, 2015/11/10 00:12:10]

Done.

+        while (ResourceClient* c = w.next())

[haraken, 2015/11/09 23:30:20]

c => client

[hiroshige, 2015/11/10 00:12:10]

Done.

+            clientNames.append(c->debugName());
+        ResourceClientWalker<ResourceClient> w2(m_clientsAwaitingCallback);
+        while (ResourceClient* c = w2.next())
+            clientNames.append("(awaiting) " + c->debugName());
+        ResourceClientWalker<ResourceClient> w3(m_finishedClients);
+        while (ResourceClient* c = w3.next())
+            clientNames.append("(finished) " + c->debugName());
+        std::sort(clientNames.begin(), clientNames.end(), codePointCompareLessThan);
+
+        StringBuilder builder;
+        for (size_t i = 0; i < clientNames.size() && i < kMaxResourceClientToShowInMemoryInfra; ++i) {
+            if (i > 0)
+                builder.append(" / ");
+            builder.append(clientNames[i]);
+        }
+        if (clientNames.size() > kMaxResourceClientToShowInMemoryInfra) {
+            builder.append(" / and ");
+            builder.appendNumber(clientNames.size() - kMaxResourceClientToShowInMemoryInfra);
+            builder.append(" more");
+        }
+        dump->addString("ResourceClient", "", builder.toString());
     }
 
     const String overheadName = dumpName + "/metadata";
     WebMemoryAllocatorDump* overheadDump = memoryDump->createMemoryAllocatorDump(overheadName);
     overheadDump->addScalar("size", "bytes", overheadSize());
     memoryDump->addSuballocation(overheadDump->guid(), String(WTF::Partitions::kAllocatedObjectPoolName));
 }
 
 String Resource::getMemoryDumpName() const
 {
@@ skipping 305 matching lines @@
         return "ImportResource";
     case Resource::Media:
         return "Media";
     }
     ASSERT_NOT_REACHED();
     return "Unknown";
 }
 #endif // !LOG_DISABLED
 
 } // namespace blink