greenplumn CMemoryPoolTracker 源码
greenplumn CMemoryPoolTracker 代码
文件路径：/src/backend/gporca/libgpos/include/gpos/memory/CMemoryPoolTracker.h
//---------------------------------------------------------------------------
// Greenplum Database
// Copyright (C) 2009-2010 Greenplum Inc.
// Copyright (C) 2011 EMC Corp.
//
// @filename:
// CMemoryPoolTracker.h
//
// @doc:
// Memory pool that allocates from malloc() and adds on
// statistics and debugging
//
// @owner:
//
// @test:
//
//---------------------------------------------------------------------------
#ifndef GPOS_CMemoryPoolTracker_H
#define GPOS_CMemoryPoolTracker_H
#include "gpos/assert.h"
#include "gpos/common/CList.h"
#include "gpos/common/CStackDescriptor.h"
#include "gpos/memory/CMemoryPool.h"
#include "gpos/memory/CMemoryPoolStatistics.h"
#include "gpos/types.h"
#include "gpos/utils.h"
namespace gpos
{
// memory pool with statistics and debugging support
class CMemoryPoolTracker : public CMemoryPool
{
private:
// Defines memory block header layout for all allocations;
// does not include the pointer to the pool;
struct SAllocHeader
{
// pointer to pool
CMemoryPoolTracker *m_mp;
// total allocation size (including headers)
ULONG m_alloc_size;
// user requested size
ULONG m_user_size;
// sequence number
ULLONG m_serial;
// file name
const CHAR *m_filename;
// line in file
ULONG m_line;
#ifdef GPOS_DEBUG
// allocation stack
CStackDescriptor m_stack_desc;
#endif // GPOS_DEBUG
// link for allocation list
SLink m_link;
};
// statistics
CMemoryPoolStatistics m_memory_pool_statistics;
// allocation sequence number
ULONG m_alloc_sequence{0};
// list of allocated (live) objects
CList<SAllocHeader> m_allocations_list;
// record a successful allocation
void RecordAllocation(SAllocHeader *header);
// record a successful free
void RecordFree(SAllocHeader *header);
protected:
// dtor
~CMemoryPoolTracker() override;
public:
CMemoryPoolTracker(CMemoryPoolTracker &) = delete;
// ctor
CMemoryPoolTracker();
// prepare the memory pool to be deleted
void TearDown() override;
// allocate memory
void *NewImpl(const ULONG bytes, const CHAR *file, const ULONG line,
CMemoryPool::EAllocationType eat) override;
// free memory allocation
static void DeleteImpl(void *ptr, EAllocationType eat);
// get user requested size of allocation
static ULONG UserSizeOfAlloc(const void *ptr);
// return total allocated size
ULLONG
TotalAllocatedSize() const override
{
return m_memory_pool_statistics.TotalAllocatedSize();
}
#ifdef GPOS_DEBUG
// check if the memory pool keeps track of live objects
BOOL
SupportsLiveObjectWalk() const override
{
return true;
}
// walk the live objects
void WalkLiveObjects(gpos::IMemoryVisitor *visitor) override;
#endif // GPOS_DEBUG
};
} // namespace gpos
#endif // !GPOS_CMemoryPoolTracker_H
// EOF
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