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Commit c83f8370 authored by Eugene Kosov's avatar Eugene Kosov Committed by Marko Mäkelä
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MDEV-18214 remove some duplicated MONITOR counters 

MONITOR_PENDING_LOG_WRITE
MONITOR_PENDING_CHECKPOINT_WRITE
MONITOR_LOG_IO: read values from log_t members instead of updating own
monitor variables
parent 8dc670a5
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Showing with 53 additions and 51 deletions
mysql-test/suite/innodb/r/innodb_skip_innodb_is_tables.result
View file @ c83f8370
...@@ -193,9 +193,9 @@ log_lsn_checkpoint_age recovery 0 NULL NULL NULL 0 NULL NULL NULL NULL NULL NULL ...@@ -193,9 +193,9 @@ log_lsn_checkpoint_age recovery 0 NULL NULL NULL 0 NULL NULL NULL NULL NULL NULL
log_lsn_buf_pool_oldest recovery 0 NULL NULL NULL 0 NULL NULL NULL NULL NULL NULL NULL disabled value The oldest modified block LSN in the buffer pool log_lsn_buf_pool_oldest recovery 0 NULL NULL NULL 0 NULL NULL NULL NULL NULL NULL NULL disabled value The oldest modified block LSN in the buffer pool
log_max_modified_age_async recovery 0 NULL NULL NULL 0 NULL NULL NULL NULL NULL NULL NULL disabled value Maximum LSN difference; when exceeded, start asynchronous preflush log_max_modified_age_async recovery 0 NULL NULL NULL 0 NULL NULL NULL NULL NULL NULL NULL disabled value Maximum LSN difference; when exceeded, start asynchronous preflush
log_max_modified_age_sync recovery 0 NULL NULL NULL 0 NULL NULL NULL NULL NULL NULL NULL disabled value Maximum LSN difference; when exceeded, start synchronous preflush log_max_modified_age_sync recovery 0 NULL NULL NULL 0 NULL NULL NULL NULL NULL NULL NULL disabled value Maximum LSN difference; when exceeded, start synchronous preflush
log_pending_log_writes recovery 0 NULL NULL NULL 0 NULL NULL NULL NULL NULL NULL NULL disabled counter Pending log writes log_pending_log_writes recovery 0 NULL NULL NULL 0 NULL NULL NULL NULL NULL NULL NULL disabled value Pending log writes
log_pending_checkpoint_writes recovery 0 NULL NULL NULL 0 NULL NULL NULL NULL NULL NULL NULL disabled counter Pending checkpoints log_pending_checkpoint_writes recovery 0 NULL NULL NULL 0 NULL NULL NULL NULL NULL NULL NULL disabled value Pending checkpoints
log_num_log_io recovery 0 NULL NULL NULL 0 NULL NULL NULL NULL NULL NULL NULL disabled counter Number of log I/Os log_num_log_io recovery 0 NULL NULL NULL 0 NULL NULL NULL NULL NULL NULL NULL disabled value Number of log I/Os
log_waits recovery 0 NULL NULL NULL 0 NULL NULL NULL NULL NULL NULL NULL disabled status_counter Number of log waits due to small log buffer (innodb_log_waits) log_waits recovery 0 NULL NULL NULL 0 NULL NULL NULL NULL NULL NULL NULL disabled status_counter Number of log waits due to small log buffer (innodb_log_waits)
log_write_requests recovery 0 NULL NULL NULL 0 NULL NULL NULL NULL NULL NULL NULL disabled status_counter Number of log write requests (innodb_log_write_requests) log_write_requests recovery 0 NULL NULL NULL 0 NULL NULL NULL NULL NULL NULL NULL disabled status_counter Number of log write requests (innodb_log_write_requests)
log_writes recovery 0 NULL NULL NULL 0 NULL NULL NULL NULL NULL NULL NULL disabled status_counter Number of log writes (innodb_log_writes) log_writes recovery 0 NULL NULL NULL 0 NULL NULL NULL NULL NULL NULL NULL disabled status_counter Number of log writes (innodb_log_writes)
......
storage/innobase/log/log0log.cc
View file @ c83f8370
...@@ -1197,7 +1197,6 @@ log_io_complete( ...@@ -1197,7 +1197,6 @@ log_io_complete(
group->n_pending_writes--; group->n_pending_writes--;
log_sys->n_pending_writes--; log_sys->n_pending_writes--;
MONITOR_DEC(MONITOR_PENDING_LOG_WRITE);
unlock = log_group_check_flush_completion(group); unlock = log_group_check_flush_completion(group);
unlock = unlock | log_sys_check_flush_completion(); unlock = unlock | log_sys_check_flush_completion();
...@@ -1246,8 +1245,6 @@ log_group_file_header_flush( ...@@ -1246,8 +1245,6 @@ log_group_file_header_flush(
if (log_do_write) { if (log_do_write) {
log_sys->n_log_ios++; log_sys->n_log_ios++;
MONITOR_INC(MONITOR_LOG_IO);
srv_stats.os_log_pending_writes.inc(); srv_stats.os_log_pending_writes.inc();
fil_io(OS_FILE_WRITE | OS_FILE_LOG, true, group->space_id, 0, fil_io(OS_FILE_WRITE | OS_FILE_LOG, true, group->space_id, 0,
...@@ -1373,8 +1370,6 @@ log_group_write_buf( ...@@ -1373,8 +1370,6 @@ log_group_write_buf(
if (log_do_write) { if (log_do_write) {
log_sys->n_log_ios++; log_sys->n_log_ios++;
MONITOR_INC(MONITOR_LOG_IO);
srv_stats.os_log_pending_writes.inc(); srv_stats.os_log_pending_writes.inc();
ut_a(next_offset / UNIV_PAGE_SIZE <= ULINT_MAX); ut_a(next_offset / UNIV_PAGE_SIZE <= ULINT_MAX);
...@@ -1514,7 +1509,6 @@ log_write_up_to( ...@@ -1514,7 +1509,6 @@ log_write_up_to(
} }
#endif /* UNIV_DEBUG */ #endif /* UNIV_DEBUG */
log_sys->n_pending_writes++; log_sys->n_pending_writes++;
MONITOR_INC(MONITOR_PENDING_LOG_WRITE);
group = UT_LIST_GET_FIRST(log_sys->log_groups); group = UT_LIST_GET_FIRST(log_sys->log_groups);
group->n_pending_writes++; /*!< We assume here that we have only group->n_pending_writes++; /*!< We assume here that we have only
...@@ -1604,7 +1598,6 @@ log_write_up_to( ...@@ -1604,7 +1598,6 @@ log_write_up_to(
group->n_pending_writes--; group->n_pending_writes--;
log_sys->n_pending_writes--; log_sys->n_pending_writes--;
MONITOR_DEC(MONITOR_PENDING_LOG_WRITE);
unlock = log_group_check_flush_completion(group); unlock = log_group_check_flush_completion(group);
unlock = unlock | log_sys_check_flush_completion(); unlock = unlock | log_sys_check_flush_completion();
...@@ -1788,7 +1781,6 @@ log_io_complete_checkpoint(void) ...@@ -1788,7 +1781,6 @@ log_io_complete_checkpoint(void)
ut_ad(log_sys->n_pending_checkpoint_writes > 0); ut_ad(log_sys->n_pending_checkpoint_writes > 0);
log_sys->n_pending_checkpoint_writes--; log_sys->n_pending_checkpoint_writes--;
MONITOR_DEC(MONITOR_PENDING_CHECKPOINT_WRITE);
if (log_sys->n_pending_checkpoint_writes == 0) { if (log_sys->n_pending_checkpoint_writes == 0) {
log_complete_checkpoint(); log_complete_checkpoint();
...@@ -1936,12 +1928,9 @@ log_group_checkpoint( ...@@ -1936,12 +1928,9 @@ log_group_checkpoint(
} }
log_sys->n_pending_checkpoint_writes++; log_sys->n_pending_checkpoint_writes++;
MONITOR_INC(MONITOR_PENDING_CHECKPOINT_WRITE);
log_sys->n_log_ios++; log_sys->n_log_ios++;
MONITOR_INC(MONITOR_LOG_IO);
/* We send as the last parameter the group machine address /* We send as the last parameter the group machine address
added with 1, as we want to distinguish between a normal log added with 1, as we want to distinguish between a normal log
file write and a checkpoint field write */ file write and a checkpoint field write */
...@@ -2028,8 +2017,6 @@ log_group_read_checkpoint_info( ...@@ -2028,8 +2017,6 @@ log_group_read_checkpoint_info(
log_sys->n_log_ios++; log_sys->n_log_ios++;
MONITOR_INC(MONITOR_LOG_IO);
fil_io(OS_FILE_READ | OS_FILE_LOG, true, group->space_id, 0, fil_io(OS_FILE_READ | OS_FILE_LOG, true, group->space_id, 0,
field / UNIV_PAGE_SIZE, field % UNIV_PAGE_SIZE, field / UNIV_PAGE_SIZE, field % UNIV_PAGE_SIZE,
OS_FILE_LOG_BLOCK_SIZE, log_sys->checkpoint_buf, NULL, 0); OS_FILE_LOG_BLOCK_SIZE, log_sys->checkpoint_buf, NULL, 0);
...@@ -2325,8 +2312,6 @@ log_group_read_log_seg( ...@@ -2325,8 +2312,6 @@ log_group_read_log_seg(
log_sys->n_log_ios++; log_sys->n_log_ios++;
MONITOR_INC(MONITOR_LOG_IO);
ut_a(source_offset / UNIV_PAGE_SIZE <= ULINT_MAX); ut_a(source_offset / UNIV_PAGE_SIZE <= ULINT_MAX);
fil_io(OS_FILE_READ | OS_FILE_LOG, sync, group->space_id, 0, fil_io(OS_FILE_READ | OS_FILE_LOG, sync, group->space_id, 0,
...@@ -2417,8 +2402,6 @@ log_group_archive_file_header_write( ...@@ -2417,8 +2402,6 @@ log_group_archive_file_header_write(
log_sys->n_log_ios++; log_sys->n_log_ios++;
MONITOR_INC(MONITOR_LOG_IO);
fil_io(OS_FILE_WRITE | OS_FILE_LOG, true, group->archive_space_id, fil_io(OS_FILE_WRITE | OS_FILE_LOG, true, group->archive_space_id,
dest_offset / UNIV_PAGE_SIZE, dest_offset / UNIV_PAGE_SIZE,
dest_offset % UNIV_PAGE_SIZE, dest_offset % UNIV_PAGE_SIZE,
...@@ -2452,8 +2435,6 @@ log_group_archive_completed_header_write( ...@@ -2452,8 +2435,6 @@ log_group_archive_completed_header_write(
log_sys->n_log_ios++; log_sys->n_log_ios++;
MONITOR_INC(MONITOR_LOG_IO);
fil_io(OS_FILE_WRITE | OS_FILE_LOG, true, group->archive_space_id, fil_io(OS_FILE_WRITE | OS_FILE_LOG, true, group->archive_space_id,
dest_offset / UNIV_PAGE_SIZE, dest_offset / UNIV_PAGE_SIZE,
dest_offset % UNIV_PAGE_SIZE, dest_offset % UNIV_PAGE_SIZE,
...@@ -2581,8 +2562,6 @@ log_group_archive( ...@@ -2581,8 +2562,6 @@ log_group_archive(
log_sys->n_log_ios++; log_sys->n_log_ios++;
MONITOR_INC(MONITOR_LOG_IO);
//TODO (jonaso): This must be dead code?? //TODO (jonaso): This must be dead code??
log_encrypt_before_write(log_sys->next_checkpoint_no, log_encrypt_before_write(log_sys->next_checkpoint_no,
buf, start_lsn, len); buf, start_lsn, len);
......
storage/innobase/srv/srv0mon.cc
View file @ c83f8370
...@@ -873,15 +873,18 @@ static monitor_info_t innodb_counter_info[] = ...@@ -873,15 +873,18 @@ static monitor_info_t innodb_counter_info[] =
MONITOR_DEFAULT_START, MONITOR_OVLD_MAX_AGE_SYNC}, MONITOR_DEFAULT_START, MONITOR_OVLD_MAX_AGE_SYNC},
{"log_pending_log_writes", "recovery", "Pending log writes", {"log_pending_log_writes", "recovery", "Pending log writes",
MONITOR_NONE, static_cast<monitor_type_t>(
MONITOR_EXISTING | MONITOR_DISPLAY_CURRENT),
MONITOR_DEFAULT_START, MONITOR_PENDING_LOG_WRITE}, MONITOR_DEFAULT_START, MONITOR_PENDING_LOG_WRITE},
{"log_pending_checkpoint_writes", "recovery", "Pending checkpoints", {"log_pending_checkpoint_writes", "recovery", "Pending checkpoints",
MONITOR_NONE, static_cast<monitor_type_t>(
MONITOR_EXISTING | MONITOR_DISPLAY_CURRENT),
MONITOR_DEFAULT_START, MONITOR_PENDING_CHECKPOINT_WRITE}, MONITOR_DEFAULT_START, MONITOR_PENDING_CHECKPOINT_WRITE},
{"log_num_log_io", "recovery", "Number of log I/Os", {"log_num_log_io", "recovery", "Number of log I/Os",
MONITOR_NONE, static_cast<monitor_type_t>(
MONITOR_EXISTING | MONITOR_DISPLAY_CURRENT),
MONITOR_DEFAULT_START, MONITOR_LOG_IO}, MONITOR_DEFAULT_START, MONITOR_LOG_IO},
{"log_waits", "recovery", {"log_waits", "recovery",
...@@ -1970,6 +1973,25 @@ srv_mon_process_existing_counter( ...@@ -1970,6 +1973,25 @@ srv_mon_process_existing_counter(
value = (mon_type_t) log_sys->lsn; value = (mon_type_t) log_sys->lsn;
break; break;
case MONITOR_PENDING_LOG_WRITE:
mutex_enter(&log_sys->mutex);
value = static_cast<mon_type_t>(log_sys->n_pending_writes);
mutex_exit(&log_sys->mutex);
break;
case MONITOR_PENDING_CHECKPOINT_WRITE:
mutex_enter(&log_sys->mutex);
value = static_cast<mon_type_t>(
log_sys->n_pending_checkpoint_writes);
mutex_exit(&log_sys->mutex);
break;
case MONITOR_LOG_IO:
mutex_enter(&log_sys->mutex);
value = static_cast<mon_type_t>(log_sys->n_log_ios);
mutex_exit(&log_sys->mutex);
break;
case MONITOR_OVLD_BUF_OLDEST_LSN: case MONITOR_OVLD_BUF_OLDEST_LSN:
value = (mon_type_t) buf_pool_get_oldest_modification(); value = (mon_type_t) buf_pool_get_oldest_modification();
break; break;
......
storage/xtradb/log/log0log.cc
View file @ c83f8370
...@@ -1305,7 +1305,6 @@ log_io_complete( ...@@ -1305,7 +1305,6 @@ log_io_complete(
group->n_pending_writes--; group->n_pending_writes--;
log_sys->n_pending_writes--; log_sys->n_pending_writes--;
MONITOR_DEC(MONITOR_PENDING_LOG_WRITE);
unlock = log_group_check_flush_completion(group); unlock = log_group_check_flush_completion(group);
unlock = unlock | log_sys_check_flush_completion(); unlock = unlock | log_sys_check_flush_completion();
...@@ -1357,8 +1356,6 @@ log_group_file_header_flush( ...@@ -1357,8 +1356,6 @@ log_group_file_header_flush(
if (log_do_write) { if (log_do_write) {
log_sys->n_log_ios++; log_sys->n_log_ios++;
MONITOR_INC(MONITOR_LOG_IO);
srv_stats.os_log_pending_writes.inc(); srv_stats.os_log_pending_writes.inc();
fil_io(OS_FILE_WRITE | OS_FILE_LOG, true, group->space_id, 0, fil_io(OS_FILE_WRITE | OS_FILE_LOG, true, group->space_id, 0,
...@@ -1483,8 +1480,6 @@ log_group_write_buf( ...@@ -1483,8 +1480,6 @@ log_group_write_buf(
if (log_do_write) { if (log_do_write) {
log_sys->n_log_ios++; log_sys->n_log_ios++;
MONITOR_INC(MONITOR_LOG_IO);
srv_stats.os_log_pending_writes.inc(); srv_stats.os_log_pending_writes.inc();
ut_a(next_offset / UNIV_PAGE_SIZE <= ULINT_MAX); ut_a(next_offset / UNIV_PAGE_SIZE <= ULINT_MAX);
...@@ -1632,7 +1627,6 @@ log_write_up_to( ...@@ -1632,7 +1627,6 @@ log_write_up_to(
} }
#endif /* UNIV_DEBUG */ #endif /* UNIV_DEBUG */
log_sys->n_pending_writes++; log_sys->n_pending_writes++;
MONITOR_INC(MONITOR_PENDING_LOG_WRITE);
group = UT_LIST_GET_FIRST(log_sys->log_groups); group = UT_LIST_GET_FIRST(log_sys->log_groups);
group->n_pending_writes++; /*!< We assume here that we have only group->n_pending_writes++; /*!< We assume here that we have only
...@@ -1724,7 +1718,6 @@ log_write_up_to( ...@@ -1724,7 +1718,6 @@ log_write_up_to(
group->n_pending_writes--; group->n_pending_writes--;
log_sys->n_pending_writes--; log_sys->n_pending_writes--;
MONITOR_DEC(MONITOR_PENDING_LOG_WRITE);
unlock = log_group_check_flush_completion(group); unlock = log_group_check_flush_completion(group);
unlock = unlock | log_sys_check_flush_completion(); unlock = unlock | log_sys_check_flush_completion();
...@@ -1939,7 +1932,6 @@ log_io_complete_checkpoint(void) ...@@ -1939,7 +1932,6 @@ log_io_complete_checkpoint(void)
ut_ad(log_sys->n_pending_checkpoint_writes > 0); ut_ad(log_sys->n_pending_checkpoint_writes > 0);
log_sys->n_pending_checkpoint_writes--; log_sys->n_pending_checkpoint_writes--;
MONITOR_DEC(MONITOR_PENDING_CHECKPOINT_WRITE);
if (log_sys->n_pending_checkpoint_writes == 0) { if (log_sys->n_pending_checkpoint_writes == 0) {
log_complete_checkpoint(); log_complete_checkpoint();
...@@ -2086,12 +2078,9 @@ log_group_checkpoint( ...@@ -2086,12 +2078,9 @@ log_group_checkpoint(
} }
log_sys->n_pending_checkpoint_writes++; log_sys->n_pending_checkpoint_writes++;
MONITOR_INC(MONITOR_PENDING_CHECKPOINT_WRITE);
log_sys->n_log_ios++; log_sys->n_log_ios++;
MONITOR_INC(MONITOR_LOG_IO);
/* We send as the last parameter the group machine address /* We send as the last parameter the group machine address
added with 1, as we want to distinguish between a normal log added with 1, as we want to distinguish between a normal log
file write and a checkpoint field write */ file write and a checkpoint field write */
...@@ -2178,8 +2167,6 @@ log_group_read_checkpoint_info( ...@@ -2178,8 +2167,6 @@ log_group_read_checkpoint_info(
log_sys->n_log_ios++; log_sys->n_log_ios++;
MONITOR_INC(MONITOR_LOG_IO);
fil_io(OS_FILE_READ | OS_FILE_LOG, true, group->space_id, 0, fil_io(OS_FILE_READ | OS_FILE_LOG, true, group->space_id, 0,
field / UNIV_PAGE_SIZE, field % UNIV_PAGE_SIZE, field / UNIV_PAGE_SIZE, field % UNIV_PAGE_SIZE,
OS_FILE_LOG_BLOCK_SIZE, log_sys->checkpoint_buf, NULL, 0); OS_FILE_LOG_BLOCK_SIZE, log_sys->checkpoint_buf, NULL, 0);
...@@ -2564,8 +2551,6 @@ log_group_read_log_seg( ...@@ -2564,8 +2551,6 @@ log_group_read_log_seg(
log_sys->n_log_ios++; log_sys->n_log_ios++;
MONITOR_INC(MONITOR_LOG_IO);
ut_a(source_offset / UNIV_PAGE_SIZE <= ULINT_MAX); ut_a(source_offset / UNIV_PAGE_SIZE <= ULINT_MAX);
if (release_mutex) { if (release_mutex) {
...@@ -2727,8 +2712,6 @@ log_group_archive_file_header_write( ...@@ -2727,8 +2712,6 @@ log_group_archive_file_header_write(
log_sys->n_log_ios++; log_sys->n_log_ios++;
MONITOR_INC(MONITOR_LOG_IO);
fil_io(OS_FILE_WRITE | OS_FILE_LOG, true, group->archive_space_id, fil_io(OS_FILE_WRITE | OS_FILE_LOG, true, group->archive_space_id,
0, 0,
dest_offset / UNIV_PAGE_SIZE, dest_offset / UNIV_PAGE_SIZE,
...@@ -2763,8 +2746,6 @@ log_group_archive_completed_header_write( ...@@ -2763,8 +2746,6 @@ log_group_archive_completed_header_write(
log_sys->n_log_ios++; log_sys->n_log_ios++;
MONITOR_INC(MONITOR_LOG_IO);
fil_io(OS_FILE_WRITE | OS_FILE_LOG, true, group->archive_space_id, fil_io(OS_FILE_WRITE | OS_FILE_LOG, true, group->archive_space_id,
0, 0,
dest_offset / UNIV_PAGE_SIZE, dest_offset / UNIV_PAGE_SIZE,
...@@ -2895,8 +2876,6 @@ log_group_archive( ...@@ -2895,8 +2876,6 @@ log_group_archive(
log_sys->n_log_ios++; log_sys->n_log_ios++;
MONITOR_INC(MONITOR_LOG_IO);
//TODO (jonaso): This must be dead code?? //TODO (jonaso): This must be dead code??
log_encrypt_before_write(log_sys->next_checkpoint_no, log_encrypt_before_write(log_sys->next_checkpoint_no,
buf, start_lsn, len); buf, start_lsn, len);
......
storage/xtradb/srv/srv0mon.cc
View file @ c83f8370
...@@ -873,15 +873,18 @@ static monitor_info_t innodb_counter_info[] = ...@@ -873,15 +873,18 @@ static monitor_info_t innodb_counter_info[] =
MONITOR_DEFAULT_START, MONITOR_OVLD_MAX_AGE_SYNC}, MONITOR_DEFAULT_START, MONITOR_OVLD_MAX_AGE_SYNC},
{"log_pending_log_writes", "recovery", "Pending log writes", {"log_pending_log_writes", "recovery", "Pending log writes",
MONITOR_NONE, static_cast<monitor_type_t>(
MONITOR_EXISTING | MONITOR_DISPLAY_CURRENT),
MONITOR_DEFAULT_START, MONITOR_PENDING_LOG_WRITE}, MONITOR_DEFAULT_START, MONITOR_PENDING_LOG_WRITE},
{"log_pending_checkpoint_writes", "recovery", "Pending checkpoints", {"log_pending_checkpoint_writes", "recovery", "Pending checkpoints",
MONITOR_NONE, static_cast<monitor_type_t>(
MONITOR_EXISTING | MONITOR_DISPLAY_CURRENT),
MONITOR_DEFAULT_START, MONITOR_PENDING_CHECKPOINT_WRITE}, MONITOR_DEFAULT_START, MONITOR_PENDING_CHECKPOINT_WRITE},
{"log_num_log_io", "recovery", "Number of log I/Os", {"log_num_log_io", "recovery", "Number of log I/Os",
MONITOR_NONE, static_cast<monitor_type_t>(
MONITOR_EXISTING | MONITOR_DISPLAY_CURRENT),
MONITOR_DEFAULT_START, MONITOR_LOG_IO}, MONITOR_DEFAULT_START, MONITOR_LOG_IO},
{"log_waits", "recovery", {"log_waits", "recovery",
...@@ -1970,6 +1973,25 @@ srv_mon_process_existing_counter( ...@@ -1970,6 +1973,25 @@ srv_mon_process_existing_counter(
value = (mon_type_t) log_sys->lsn; value = (mon_type_t) log_sys->lsn;
break; break;
case MONITOR_PENDING_LOG_WRITE:
mutex_enter(&log_sys->mutex);
value = static_cast<mon_type_t>(log_sys->n_pending_writes);
mutex_exit(&log_sys->mutex);
break;
case MONITOR_PENDING_CHECKPOINT_WRITE:
mutex_enter(&log_sys->mutex);
value = static_cast<mon_type_t>(
log_sys->n_pending_checkpoint_writes);
mutex_exit(&log_sys->mutex);
break;
case MONITOR_LOG_IO:
mutex_enter(&log_sys->mutex);
value = static_cast<mon_type_t>(log_sys->n_log_ios);
mutex_exit(&log_sys->mutex);
break;
case MONITOR_OVLD_BUF_OLDEST_LSN: case MONITOR_OVLD_BUF_OLDEST_LSN:
value = (mon_type_t) buf_pool_get_oldest_modification(); value = (mon_type_t) buf_pool_get_oldest_modification();
break; break;
......
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