content: Use at most 128MB of discardable memory on Android.

content/child/child_discardable_shared_memory_manager.cc

 // Copyright 2014 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 "content/child/child_discardable_shared_memory_manager.h"
 
 #include "base/atomic_sequence_num.h"
 #include "base/bind.h"
 #include "base/debug/crash_logging.h"
 #include "base/memory/discardable_memory.h"
 #include "base/memory/discardable_shared_memory.h"
 #include "base/metrics/histogram.h"
 #include "base/process/memory.h"
 #include "base/process/process_metrics.h"
 #include "base/strings/string_number_conversions.h"
 #include "base/thread_task_runner_handle.h"
 #include "base/trace_event/memory_dump_manager.h"
 #include "base/trace_event/trace_event.h"
 #include "content/common/child_process_messages.h"
 
 namespace content {
 namespace {
 
 // Default allocation size.
-#if defined(OS_ANDROID)
-// Larger allocation size on Android to avoid reaching the FD-limit.
-const size_t kAllocationSize = 32 * 1024 * 1024;
-#else
 const size_t kAllocationSize = 4 * 1024 * 1024;
-#endif
 
 // Global atomic to generate unique discardable shared memory IDs.
 base::StaticAtomicSequenceNumber g_next_discardable_shared_memory_id;
 
 class DiscardableMemoryImpl : public base::DiscardableMemory {
  public:
   DiscardableMemoryImpl(ChildDiscardableSharedMemoryManager* manager,
                         scoped_ptr<DiscardableSharedMemoryHeap::Span> span)
       : manager_(manager), span_(span.Pass()), is_locked_(true) {}
 
@@ skipping 253 matching lines @@
       "discardable-memory-allocated";
   base::debug::SetCrashKeyValue(kDiscardableMemoryAllocatedKey,
                                 base::Uint64ToString(new_bytes_total));
 
   static const char kDiscardableMemoryFreeKey[] = "discardable-memory-free";
   base::debug::SetCrashKeyValue(kDiscardableMemoryFreeKey,
                                 base::Uint64ToString(new_bytes_free));
 }
 
 }  // namespace content