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/*****************************************************************************

Copyright (c) 2014, 2023, 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.

This program is also distributed with certain software (including
but not limited to OpenSSL) that is licensed under separate terms,
as designated in a particular file or component or in included license
documentation.  The authors of MySQL hereby grant you an additional
permission to link the program and your derivative works with the
separately licensed software that they have included with MySQL.

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 along with
this program; if not, write to the Free Software Foundation, Inc.,
51 Franklin Street, Suite 500, Boston, MA 02110-1335 USA

*****************************************************************************/

/**************************************************//**
@file ut/ut0new.cc
Instrumented memory allocator.

Created May 26, 2014 Vasil Dimov
*******************************************************/

#include "univ.i"

#include "ut0new.h"

/** Maximum number of retries to allocate memory. */
const size_t	alloc_max_retries = 60;

/** Keys for registering allocations with performance schema.
Keep this list alphabetically sorted. */
PSI_memory_key	mem_key_ahi;
PSI_memory_key	mem_key_buf_buf_pool;
PSI_memory_key	mem_key_dict_stats_bg_recalc_pool_t;
PSI_memory_key	mem_key_dict_stats_index_map_t;
PSI_memory_key	mem_key_dict_stats_n_diff_on_level;
PSI_memory_key	mem_key_other;
PSI_memory_key	mem_key_row_log_buf;
PSI_memory_key	mem_key_row_merge_sort;
PSI_memory_key	mem_key_std;
PSI_memory_key	mem_key_trx_sys_t_rw_trx_ids;
PSI_memory_key	mem_key_partitioning;

#ifdef UNIV_PFS_MEMORY

/** Auxiliary array of performance schema 'PSI_memory_info'.
Each allocation appears in
performance_schema.memory_summary_global_by_event_name (and alike) in the form
of e.g. 'memory/innodb/NAME' where the last component NAME is picked from
the list below:
1. If key is specified, then the respective name is used
2. Without a specified key, allocations from inside std::* containers use
   mem_key_std
3. Without a specified key, allocations from outside std::* pick up the key
   based on the file name, and if file name is not found in the predefined list
   (in ut_new_boot()) then mem_key_other is used.
Keep this list alphabetically sorted. */
static PSI_memory_info	pfs_info[] = {
	{&mem_key_ahi, "adaptive hash index", 0},
	{&mem_key_buf_buf_pool, "buf_buf_pool", 0},
	{&mem_key_dict_stats_bg_recalc_pool_t, "dict_stats_bg_recalc_pool_t", 0},
	{&mem_key_dict_stats_index_map_t, "dict_stats_index_map_t", 0},
	{&mem_key_dict_stats_n_diff_on_level, "dict_stats_n_diff_on_level", 0},
	{&mem_key_other, "other", 0},
	{&mem_key_row_log_buf, "row_log_buf", 0},
	{&mem_key_row_merge_sort, "row_merge_sort", 0},
	{&mem_key_std, "std", 0},
	{&mem_key_trx_sys_t_rw_trx_ids, "trx_sys_t::rw_trx_ids", 0},
	{&mem_key_partitioning, "partitioning", 0},
};

/** Map used for default performance schema keys, based on file name of the
caller. The key is the file name of the caller and the value is a pointer
to a PSI_memory_key variable to be passed to performance schema methods.
We use ut_strcmp_functor because by default std::map will compare the pointers
themselves (cont char*) and not do strcmp(). */
typedef std::map<const char*, PSI_memory_key*, ut_strcmp_functor>
	mem_keys_auto_t;

/** Map of filename/pfskey, used for tracing allocations that have not
provided a manually created pfs key. This map is only ever modified (bulk
insert) at startup in a single-threaded environment by ut_new_boot().
Later it is only read (only std::map::find() is called) from multithreaded
environment, thus it is not protected by any latch. */
static mem_keys_auto_t	mem_keys_auto;

#endif /* UNIV_PFS_MEMORY */

/** Setup the internal objects needed for UT_NEW() to operate.
This must be called before the first call to UT_NEW(). */
void
ut_new_boot()
{
#ifdef UNIV_PFS_MEMORY
	static const char*	auto_event_names[] = {
		/* Keep this list alphabetically sorted. */
		"api0api",
		"btr0btr",
		"btr0bulk",
		"btr0cur",
		"btr0pcur",
		"btr0sea",
		"buf0buf",
		"buf0dblwr",
		"buf0dump",
		"buf0flu",
		"buf0lru",
		"dict0dict",
		"dict0mem",
		"dict0stats",
		"dict0stats_bg",
		"eval0eval",
		"fil0fil",
		"fsp0file",
		"fsp0space",
		"fsp0sysspace",
		"fts0ast",
		"fts0config",
		"fts0fts",
		"fts0opt",
		"fts0pars",
		"fts0que",
		"fts0sql",
		"gis0sea",
		"ha0ha",
		"ha_innodb",
		"handler0alter",
		"hash0hash",
		"i_s",
		"ibuf0ibuf",
		"lexyy",
		"lock0lock",
		"log0log",
		"log0recv",
		"mem0mem",
		"os0event",
		"os0file",
		"page0cur",
		"page0zip",
		"pars0lex",
		"read0read",
		"rem0rec",
		"row0ftsort",
		"row0import",
		"row0log",
		"row0merge",
		"row0mysql",
		"row0sel",
		"row0trunc",
		"srv0conc",
		"srv0srv",
		"srv0start",
		"sync0arr",
		"sync0debug",
		"sync0rw",
		"sync0types",
		"trx0i_s",
		"trx0purge",
		"trx0roll",
		"trx0rseg",
		"trx0sys",
		"trx0trx",
		"trx0undo",
		"usr0sess",
		"ut0list",
		"ut0mem",
		"ut0mutex",
		"ut0pool",
		"ut0rbt",
		"ut0wqueue",
	};
	static const size_t	n_auto = UT_ARR_SIZE(auto_event_names);
	static PSI_memory_key	auto_event_keys[n_auto];
	static PSI_memory_info	pfs_info_auto[n_auto];

	for (size_t i = 0; i < n_auto; i++) {

		const std::pair<mem_keys_auto_t::iterator, bool>	ret
			MY_ATTRIBUTE((unused))
			= mem_keys_auto.insert(
			mem_keys_auto_t::value_type(auto_event_names[i],
						    &auto_event_keys[i]));

		/* ret.second is true if new element has been inserted */
		ut_a(ret.second);

		/* e.g. "btr0btr" */
		pfs_info_auto[i].m_name = auto_event_names[i];

		/* a pointer to the pfs key */
		pfs_info_auto[i].m_key = &auto_event_keys[i];

		pfs_info_auto[i].m_flags = 0;
	}

	PSI_MEMORY_CALL(register_memory)("innodb",
					 pfs_info,
					 UT_ARR_SIZE(pfs_info));
	PSI_MEMORY_CALL(register_memory)("innodb",
					 pfs_info_auto,
					 n_auto);
#endif /* UNIV_PFS_MEMORY */
}

#ifdef UNIV_PFS_MEMORY

/** Retrieve a memory key (registered with PFS), given a portion of the file
name of the caller.
@param[in]	file	portion of the filename - basename without an extension
@return registered memory key or PSI_NOT_INSTRUMENTED if not found */
PSI_memory_key
ut_new_get_key_by_file(
	const char*	file)
{
	mem_keys_auto_t::const_iterator	el = mem_keys_auto.find(file);

	if (el != mem_keys_auto.end()) {
		return(*(el->second));
	}

	return(PSI_NOT_INSTRUMENTED);
}

#endif /* UNIV_PFS_MEMORY */

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