Fixed bug#11753187 (formerly known as bug 44585): SP_CACHE BEHAVES AS

MEMORY LEAK.

Background:
 - There are caches for stored functions and stored procedures (SP-cache);
 - There is no similar cache for events;
 - Triggers are cached together with TABLE objects;
 - Those SP-caches are per-session (i.e. specific to each session);
 - A stored routine is represented by a sp_head-instance internally;
 - SP-cache basically contains sp_head-objects of stored routines, which
   have been executed in a session;
 - sp_head-object is added into the SP-cache before the corresponding
   stored routine is executed;
 - SP-cache is flushed in the end of the session.

The problem was that SP-cache might grow without any limit. Although this
was not a pure memory leak (the SP-cache is flushed when session is closed),
this is still a problem, because the user might take much memory by
executing many stored routines.

The patch fixes this problem in the least-intrusive way. A soft limit
(similar to the size of table definition cache) is introduced. To represent
such limit the new runtime configuration parameter 'stored_program_cache'
is introduced. The value of this parameter is stored in the new global
variable stored_program_cache_size that used to control the size of SP-cache
to overflow. 

The parameter 'stored_program_cache' limits number of cached routines for
each thread. It has the following min/default/max values given from support:
  min = 256, default = 256, max = 512 * 1024.
Also it should be noted that this parameter limits the size of 
each cache (for stored procedures and for stored functions) separately.

The SP-cache size is checked after top-level statement is parsed.
If SP-cache size exceeds the limit specified by parameter
'stored_program_cache' then SP-cache is flushed and memory allocated for
cache objects is freed. Such approach allows to flush cache safely 
when there are dependencies among stored routines.

1 files changed, 7 insertions, 0 deletions

diff --git a/sql/sys_vars.cc b/sql/sys_vars.cc
index f5a9ab3b55c..b640bdba491 100644
--- a/sql/sys_vars.cc
+++ b/sql/sys_vars.cc
@@ -3253,6 +3253,13 @@ static Sys_var_tz Sys_time_zone(
        SESSION_VAR(time_zone), NO_CMD_LINE,
        DEFAULT(&default_tz), NO_MUTEX_GUARD, IN_BINLOG);
 
+static Sys_var_ulong Sys_sp_cache_size(
+       "stored_program_cache",
+       "The soft upper limit for number of cached stored routines for "
+       "one connection.",
+       GLOBAL_VAR(stored_program_cache_size), CMD_LINE(REQUIRED_ARG),
+       VALID_RANGE(256, 512 * 1024), DEFAULT(256), BLOCK_SIZE(1));
+
 
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