config: new `lua.memory` option.

[TarantoolBot]

Dev. issue: (tarantool/tarantool#9849)

Product: Tarantool
Since: 3.3.0
Root document:

• https://www.tarantool.io/en/doc/latest/reference/configuration/configuration_reference/
• (possibly somewhere) in https://www.tarantool.io/en/doc/latest/platform/app/

SME: @ georgiy-belyanin

Details

Maximum amount of memory available for can now be specified using
a lua.memory config option.

The value represents amount of memory available to Lua in bytes. By
default it equals to 2GB. The limit can't be less than 256MB. Both
increasing and decreasing the limit is allowed if there would be enough
unused memory after applying a new value. Otherwise, the instance should
be restarted for the new limit to be applied.

Example for limiting Lua memory with 2GB:

lua:
    memory: 2147483648

Requested by @georgiy-belyanin in tarantool/tarantool@eaf401f.

[georgiy-belyanin]

It's suggested to include it in configuration reference as follows:

lua

This section defines configuration parameters related to Lua within Tarantool.

lua.memory

Define amount of memory available to Lua in bytes. Default is 2GB, with a minimum of 256MB.

The limit can be adjusted dynamically if the new value is greater than the used memory amount. Otherwise, a restart is required for
changes to take effect.