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/*
* Copyright (C) 2012 Google Inc. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are
* met:
*
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* * Redistributions in binary form must reproduce the above
* copyright notice, this list of conditions and the following disclaimer
* in the documentation and/or other materials provided with the
* distribution.
* * Neither the name of Google Inc. nor the names of its
* contributors may be used to endorse or promote products derived from
* this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#ifndef MemoryUsageSupport_h
#define MemoryUsageSupport_h
#include <wtf/Forward.h>
#include <wtf/text/WTFString.h>
namespace WebCore {
class MemoryUsageSupport {
public:
// Returns the current space allocated for the pagefile, in MB.
// That is committed size for Windows and virtual memory size for POSIX.
static int memoryUsageMB();
// Same as above, but always returns actual value, without any
// caches.
static int actualMemoryUsageMB();
// If memory usage is below this threshold, do not bother forcing GC.
static int lowMemoryUsageMB();
// If memory usage is above this threshold, force GC more aggressively.
static int highMemoryUsageMB();
// Delta of memory usage growth (vs. last actualMemoryUsageMB())
// to force GC when memory usage is high.
static int highUsageDeltaMB();
// Returns private and shared usage, in bytes. Private bytes is the amount of
// memory currently allocated to this process that cannot be shared. Returns
// false on platform specific error conditions.
static bool processMemorySizesInBytes(size_t* privateBytes, size_t* sharedBytes);
class ComponentInfo {
public:
ComponentInfo(const String& name, size_t size) : m_name(name), m_sizeInBytes(size) { }
const String m_name;
size_t m_sizeInBytes;
};
// Reports private memory used by components in bytes.
static void memoryUsageByComponents(Vector<ComponentInfo>&);
};
} // namespace WebCore
#endif // MemoryUsageSupport_h
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