psi_memory_bits.h

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/* Copyright (c) 2013, 2025, Oracle and/or its affiliates.
 
  This program is free software; you can redistribute it and/or modify
  it under the terms of the GNU General Public License, version 2.0,
  as published by the Free Software Foundation.
 
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  This program is distributed in the hope that it will be useful,
  but WITHOUT ANY WARRANTY; without even the implied warranty of
  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  GNU General Public License, version 2.0, for more details.
 
  You should have received a copy of the GNU General Public License
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#ifndef COMPONENTS_SERVICES_BITS_PSI_MEMORY_BITS_H
#define COMPONENTS_SERVICES_BITS_PSI_MEMORY_BITS_H
 
#ifndef MYSQL_ABI_CHECK
#include <stddef.h> /* size_t */
#endif
 
#include <mysql/components/services/bits/psi_bits.h>
 
/**
  @file mysql/components/services/bits/psi_memory_bits.h
  Performance schema instrumentation interface.
*/
 
/**
  @defgroup psi_abi_memory Memory Instrumentation (ABI)
  @ingroup psi_abi
  @{
*/
 
/**
  Instrumented memory key.
  To instrument memory, a memory key must be obtained using @c register_memory.
  Using a zero key always disable the instrumentation.
*/
typedef unsigned int PSI_memory_key;
 
struct PSI_thread;
 
/**
  Memory instrument information.
  @since PSI_MEMORY_VERSION_1
  This structure is used to register instrumented memory.
*/
struct PSI_memory_info_v1 {
  /** Pointer to the key assigned to the registered memory. */
  PSI_memory_key *m_key;
  /** The name of the memory instrument to register. */
  const char *m_name;
  /**
    The flags of the memory instrument to register.
    @sa PSI_FLAG_ONLY_GLOBAL_STAT
  */
  unsigned int m_flags;
  /** Volatility index. */
  int m_volatility;
  /** Documentation. */
  const char *m_documentation;
};
typedef struct PSI_memory_info_v1 PSI_memory_info_v1;
 
/**
  Memory registration API.
  @param category a category name (typically a plugin name)
  @param info an array of memory info to register
  @param count the size of the info array
*/
typedef void (*register_memory_v1_t)(const char *category,
                                     struct PSI_memory_info_v1 *info,
                                     int count);
 
/**
  Instrument memory allocation.
  @param key the memory instrument key
  @param size the size of memory allocated
  @param[out] owner the memory owner
  @return the effective memory instrument key
*/
typedef PSI_memory_key (*memory_alloc_v1_t)(PSI_memory_key key, size_t size,
                                            struct PSI_thread **owner);
 
/**
  Instrument memory re allocation.
  @param key the memory instrument key
  @param old_size the size of memory previously allocated
  @param new_size the size of memory re allocated
  @param[in, out] owner the memory owner
  @return the effective memory instrument key
*/
typedef PSI_memory_key (*memory_realloc_v1_t)(PSI_memory_key key,
                                              size_t old_size, size_t new_size,
                                              struct PSI_thread **owner);
 
/**
  Instrument memory claim.
  @param key the memory instrument key
  @param size the size of memory allocated
  @param[in, out] owner the memory owner
  @return the effective memory instrument key
*/
typedef PSI_memory_key (*memory_claim_v1_t)(PSI_memory_key key, size_t size,
                                            struct PSI_thread **owner);
 
/**
  Instrument memory claim.
  @param key the memory instrument key
  @param size the size of memory allocated
  @param[in, out] owner the memory owner
  @param claim True to claim, false to unclaim
  @return the effective memory instrument key
*/
typedef PSI_memory_key (*memory_claim_v2_t)(PSI_memory_key key, size_t size,
                                            struct PSI_thread **owner,
                                            bool claim);
 
/**
  Instrument memory free.
  @param key the memory instrument key
  @param size the size of memory allocated
  @param owner the memory owner
*/
typedef void (*memory_free_v1_t)(PSI_memory_key key, size_t size,
                                 struct PSI_thread *owner);
 
typedef struct PSI_memory_info_v1 PSI_memory_info;
 
/** @} (end of group psi_abi_memory) */
 
#endif /* COMPONENTS_SERVICES_BITS_PSI_MEMORY_BITS_H */