Limit dead resource capacity in Blink cache to 50%.

chrome/browser/renderer_host/web_cache_manager.cc

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "chrome/browser/renderer_host/web_cache_manager.h"
 
 #include <algorithm>
 
 #include "base/bind.h"
 #include "base/compiler_specific.h"
@@ skipping 297 matching lines @@
 void WebCacheManager::EnactStrategy(const AllocationStrategy& strategy) {
   // Inform each render process of its cache allocation.
   AllocationStrategy::const_iterator allocation = strategy.begin();
   while (allocation != strategy.end()) {
     content::RenderProcessHost* host =
         content::RenderProcessHost::FromID(allocation->first);
     if (host) {
       // This is the capacity this renderer has been allocated.
       size_t capacity = allocation->second;
 
-      // We don't reserve any space for dead objects in the cache.  Instead, we
-      // prefer to keep live objects around.  There is probably some performance
+      // We don't reserve any space for dead objects in the cache. Instead, we
+      // prefer to keep live objects around. There is probably some performance
       // tuning to be done here.
       size_t min_dead_capacity = 0;
 
-      // We allow the dead objects to consume all of the cache, if the renderer
-      // so desires.  If we wanted this memory, we would have set the total
-      // capacity lower.
-      size_t max_dead_capacity = capacity;
+      // We allow the dead objects to consume up to half of the cache capacity.
+      size_t max_dead_capacity = capacity / 2;
 
       host->Send(new ChromeViewMsg_SetCacheCapacities(min_dead_capacity,
                                                       max_dead_capacity,
                                                       capacity));
     }
     ++allocation;
   }
 }
 
 void WebCacheManager::ClearRendererCache(
@@ skipping 97 matching lines @@
     if (idle >= TimeDelta::FromMinutes(kRendererInactiveThresholdMinutes)) {
       // Moved to inactive status.  This invalidates our iterator.
       inactive_renderers_.insert(*iter);
       active_renderers_.erase(*iter);
       iter = active_renderers_.begin();
       continue;
     }
     ++iter;
   }
 }