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Allocate Session_sysvars_tracker statically

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One less new/delete per connection.

Removed m_mem_flag since most allocs are thread specific. The only
exception are allocs performed during initialization.

Removed State_tracker and Session_tracker constructors as they don't make
sense anymore.

No reason to access session_sysvars_tracker via get_tracker(), so access
it directly instead.

Part of MDEV-14984 - regression in connect performance
This commit is contained in:
Sergey Vojtovich
2019-03-19 00:40:26 +04:00
parent a7adc2ce16
commit 554ac6f393
5 changed files with 156 additions and 213 deletions
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9
sql/sql_class.cc
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@ -1661,7 +1661,7 @@ THD::~THD()
/* trick to make happy memory accounting system */
#ifndef EMBEDDED_LIBRARY
session_tracker.deinit();
session_tracker.sysvars.deinit();
#endif //EMBEDDED_LIBRARY
if (status_var.local_memory_used != 0)
@ -7302,12 +7302,11 @@ void THD::set_last_commit_gtid(rpl_gtid &gtid)
#endif
m_last_commit_gtid= gtid;
#ifndef EMBEDDED_LIBRARY
if (changed_gtid &&
session_tracker.get_tracker(SESSION_SYSVARS_TRACKER)->is_enabled())
if (changed_gtid && session_tracker.sysvars.is_enabled())
{
session_tracker.get_tracker(SESSION_SYSVARS_TRACKER)->
session_tracker.sysvars.
mark_as_changed(this, (LEX_CSTRING*)Sys_last_gtid_ptr);
}
}
#endif
}