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/* Copyright (c) 2010, 2015, Oracle and/or its affiliates. All rights reserved.
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; version 2 of the License.
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 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, Fifth Floor, Boston, MA 02110-1335 USA */
/**
@file storage/perfschema/pfs_host.cc
Performance schema host (implementation).
*/
#include "my_global.h"
#include "my_sys.h"
#include "pfs.h"
#include "pfs_stat.h"
#include "pfs_instr.h"
#include "pfs_setup_actor.h"
#include "pfs_host.h"
#include "pfs_global.h"
#include "pfs_instr_class.h"
/**
@addtogroup Performance_schema_buffers
@{
*/
ulong host_max;
ulong host_lost;
PFS_host *host_array= NULL;
static PFS_single_stat *host_instr_class_waits_array= NULL;
static PFS_stage_stat *host_instr_class_stages_array= NULL;
static PFS_statement_stat *host_instr_class_statements_array= NULL;
LF_HASH host_hash;
static bool host_hash_inited= false;
/**
Initialize the host buffers.
@param param sizing parameters
@return 0 on success
*/
int init_host(const PFS_global_param *param)
{
uint index;
host_max= param->m_host_sizing;
host_array= NULL;
host_instr_class_waits_array= NULL;
host_instr_class_stages_array= NULL;
host_instr_class_statements_array= NULL;
uint waits_sizing= host_max * wait_class_max;
uint stages_sizing= host_max * stage_class_max;
uint statements_sizing= host_max * statement_class_max;
if (host_max > 0)
{
host_array= PFS_MALLOC_ARRAY(host_max, sizeof(PFS_host), PFS_host,
MYF(MY_ZEROFILL));
if (unlikely(host_array == NULL))
return 1;
}
if (waits_sizing > 0)
{
host_instr_class_waits_array=
PFS_connection_slice::alloc_waits_slice(waits_sizing);
if (unlikely(host_instr_class_waits_array == NULL))
return 1;
}
if (stages_sizing > 0)
{
host_instr_class_stages_array=
PFS_connection_slice::alloc_stages_slice(stages_sizing);
if (unlikely(host_instr_class_stages_array == NULL))
return 1;
}
if (statements_sizing > 0)
{
host_instr_class_statements_array=
PFS_connection_slice::alloc_statements_slice(statements_sizing);
if (unlikely(host_instr_class_statements_array == NULL))
return 1;
}
for (index= 0; index < host_max; index++)
{
host_array[index].m_instr_class_waits_stats=
&host_instr_class_waits_array[index * wait_class_max];
host_array[index].m_instr_class_stages_stats=
&host_instr_class_stages_array[index * stage_class_max];
host_array[index].m_instr_class_statements_stats=
&host_instr_class_statements_array[index * statement_class_max];
}
return 0;
}
/** Cleanup all the host buffers. */
void cleanup_host(void)
{
pfs_free(host_array);
host_array= NULL;
pfs_free(host_instr_class_waits_array);
host_instr_class_waits_array= NULL;
pfs_free(host_instr_class_stages_array);
host_instr_class_stages_array= NULL;
pfs_free(host_instr_class_statements_array);
host_instr_class_statements_array= NULL;
host_max= 0;
}
C_MODE_START
static uchar *host_hash_get_key(const uchar *entry, size_t *length,
my_bool)
{
const PFS_host * const *typed_entry;
const PFS_host *host;
const void *result;
typed_entry= reinterpret_cast<const PFS_host* const *> (entry);
DBUG_ASSERT(typed_entry != NULL);
host= *typed_entry;
DBUG_ASSERT(host != NULL);
*length= host->m_key.m_key_length;
result= host->m_key.m_hash_key;
return const_cast<uchar*> (reinterpret_cast<const uchar*> (result));
}
C_MODE_END
/**
Initialize the host hash.
@return 0 on success
*/
int init_host_hash(void)
{
if ((! host_hash_inited) && (host_max > 0))
{
lf_hash_init(&host_hash, sizeof(PFS_host*), LF_HASH_UNIQUE,
0, 0, host_hash_get_key, &my_charset_bin);
/* host_hash.size= host_max; */
host_hash_inited= true;
}
return 0;
}
/** Cleanup the host hash. */
void cleanup_host_hash(void)
{
if (host_hash_inited)
{
lf_hash_destroy(&host_hash);
host_hash_inited= false;
}
}
static LF_PINS* get_host_hash_pins(PFS_thread *thread)
{
if (unlikely(thread->m_host_hash_pins == NULL))
{
if (! host_hash_inited)
return NULL;
thread->m_host_hash_pins= lf_hash_get_pins(&host_hash);
}
return thread->m_host_hash_pins;
}
static void set_host_key(PFS_host_key *key,
const char *host, uint host_length)
{
DBUG_ASSERT(host_length <= HOSTNAME_LENGTH);
char *ptr= &key->m_hash_key[0];
if (host_length > 0)
{
memcpy(ptr, host, host_length);
ptr+= host_length;
}
ptr[0]= 0;
ptr++;
key->m_key_length= ptr - &key->m_hash_key[0];
}
PFS_host *find_or_create_host(PFS_thread *thread,
const char *hostname, uint hostname_length)
{
if (host_max == 0)
{
host_lost++;
return NULL;
}
LF_PINS *pins= get_host_hash_pins(thread);
if (unlikely(pins == NULL))
{
host_lost++;
return NULL;
}
PFS_host_key key;
set_host_key(&key, hostname, hostname_length);
PFS_host **entry;
uint retry_count= 0;
const uint retry_max= 3;
search:
entry= reinterpret_cast<PFS_host**>
(lf_hash_search(&host_hash, pins,
key.m_hash_key, key.m_key_length));
if (entry && (entry != MY_ERRPTR))
{
PFS_host *pfs;
pfs= *entry;
pfs->inc_refcount();
lf_hash_search_unpin(pins);
return pfs;
}
lf_hash_search_unpin(pins);
PFS_scan scan;
uint random= randomized_index(hostname, host_max);
for (scan.init(random, host_max);
scan.has_pass();
scan.next_pass())
{
PFS_host *pfs= host_array + scan.first();
PFS_host *pfs_last= host_array + scan.last();
for ( ; pfs < pfs_last; pfs++)
{
if (pfs->m_lock.is_free())
{
if (pfs->m_lock.free_to_dirty())
{
pfs->m_key= key;
if (hostname_length > 0)
pfs->m_hostname= &pfs->m_key.m_hash_key[0];
else
pfs->m_hostname= NULL;
pfs->m_hostname_length= hostname_length;
pfs->init_refcount();
pfs->reset_stats();
pfs->m_disconnected_count= 0;
int res;
res= lf_hash_insert(&host_hash, pins, &pfs);
if (likely(res == 0))
{
pfs->m_lock.dirty_to_allocated();
return pfs;
}
pfs->m_lock.dirty_to_free();
if (res > 0)
{
if (++retry_count > retry_max)
{
host_lost++;
return NULL;
}
goto search;
}
host_lost++;
return NULL;
}
}
}
}
host_lost++;
return NULL;
}
void PFS_host::aggregate()
{
aggregate_waits();
aggregate_stages();
aggregate_statements();
aggregate_stats();
}
void PFS_host::aggregate_waits()
{
/* No parent to aggregate to, clean the stats */
reset_waits_stats();
}
void PFS_host::aggregate_stages()
{
/*
Aggregate EVENTS_STAGES_SUMMARY_BY_HOST_BY_EVENT_NAME to:
- EVENTS_STAGES_SUMMARY_GLOBAL_BY_EVENT_NAME
*/
aggregate_all_stages(m_instr_class_stages_stats,
global_instr_class_stages_array);
}
void PFS_host::aggregate_statements()
{
/*
Aggregate EVENTS_STATEMENTS_SUMMARY_BY_HOST_BY_EVENT_NAME to:
- EVENTS_STATEMENTS_SUMMARY_GLOBAL_BY_EVENT_NAME
*/
aggregate_all_statements(m_instr_class_statements_stats,
global_instr_class_statements_array);
}
void PFS_host::aggregate_stats()
{
/* No parent to aggregate to, clean the stats */
m_disconnected_count= 0;
}
void PFS_host::release()
{
dec_refcount();
}
PFS_host *sanitize_host(PFS_host *unsafe)
{
if ((&host_array[0] <= unsafe) &&
(unsafe < &host_array[host_max]))
return unsafe;
return NULL;
}
void purge_host(PFS_thread *thread, PFS_host *host)
{
LF_PINS *pins= get_host_hash_pins(thread);
if (unlikely(pins == NULL))
return;
PFS_host **entry;
entry= reinterpret_cast<PFS_host**>
(lf_hash_search(&host_hash, pins,
host->m_key.m_hash_key, host->m_key.m_key_length));
if (entry && (entry != MY_ERRPTR))
{
DBUG_ASSERT(*entry == host);
if (host->get_refcount() == 0)
{
lf_hash_delete(&host_hash, pins,
host->m_key.m_hash_key, host->m_key.m_key_length);
host->m_lock.allocated_to_free();
}
}
lf_hash_search_unpin(pins);
}
/** Purge non connected hosts, reset stats of connected hosts. */
void purge_all_host(void)
{
PFS_thread *thread= PFS_thread::get_current_thread();
if (unlikely(thread == NULL))
return;
PFS_host *pfs= host_array;
PFS_host *pfs_last= host_array + host_max;
for ( ; pfs < pfs_last; pfs++)
{
if (pfs->m_lock.is_populated())
{
pfs->aggregate();
if (pfs->get_refcount() == 0)
purge_host(thread, pfs);
}
}
}
/** @} */
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