What is OBJECTSTORE_LBSS?

My database instance was running slow. I logged into the machine to find SQLServer was taking 32GB of memory(out of 32GB), odd since I configured it to only take 14GB.

Ran the following:   

select name,
   type, SUM(single_pages_kb + multi_pages_kb)
   AS MemoryKB FROM sys.dm_os_memory_clerks
   GROUP BY name, type ORDER BY MemoryKB desc

Name        Type                         MemoryKB
LbssCache OBJECTSTORE_LBSS 46247928
Default MEMORYCLERK_SQLGENERAL 2439752
SOS_Node MEMORYCLERK_SOSNODE 2106560
Default MEMORYCLERK_BHF 288168   ...

This is SQL Server 2008 (10.0.2710) x64

Does anyone know whatOBJECTSTORE_LBSS are or do?

I ended up restarting the instance but would like to find a place to look before this happens again.

Thanks, Amy