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Fix Bug #54538 - use of exclusive innodb dictionary lock limits performance.

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This patch doesn't get rid of the need to acquire the dict_sys->mutex but
reduces the need to keep the mutex locked for the duration of the query
to fsp_get_available_space_in_free_extents() from ha_innobase::info().
 
This is a port of revno:3548 from the builtin to the plugin.

rb://501 Approved by Jimmy Yang and Marko Makela.
This commit is contained in:
Sunny Bains 2010-11-03 12:40:53 +11:00
commit c64f952699
5 changed files with 134 additions and 34 deletions
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19
storage/innodb_plugin/handler/ha_innodb.cc
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@ -7637,19 +7637,12 @@ ha_innobase::info_low(
innodb_crash_recovery is set to a high value. */
stats.delete_length = 0;
} else {
/* lock the data dictionary to avoid races with
ibd_file_missing and tablespace_discarded */
row_mysql_lock_data_dictionary(prebuilt->trx);
ullint avail_space;
/* ib_table->space must be an existent tablespace */
if (!ib_table->ibd_file_missing
&& !ib_table->tablespace_discarded) {
stats.delete_length =
fsp_get_available_space_in_free_extents(
ib_table->space) * 1024;
} else {
avail_space = fsp_get_available_space_in_free_extents(
ib_table->space);
if (avail_space == ULLINT_UNDEFINED) {
THD* thd;
thd = ha_thd();
@ -7666,9 +7659,9 @@ ha_innobase::info_low(
ib_table->name);
stats.delete_length = 0;
} else {
stats.delete_length = avail_space * 1024;
}
row_mysql_unlock_data_dictionary(prebuilt->trx);
}
stats.check_time = 0;