Hi, On 2018-03-23 14:33:25 -0400, Tom Lane wrote: > func_cxt = AllocSetContextCreate(TopMemoryContext, > "PL/pgSQL function context", > ALLOCSET_DEFAULT_SIZES); > plpgsql_compile_tmp_cxt = MemoryContextSwitchTo(func_cxt); > > function->fn_signature = format_procedure(fcinfo->flinfo->fn_oid); > + MemoryContextSetIdentifier(func_cxt, function->fn_signature); > function->fn_oid = fcinfo->flinfo->fn_oid; > function->fn_xmin = HeapTupleHeaderGetRawXmin(procTup->t_data); > > This would cost an extra char * field in struct MemoryContextData, > which is slightly annoying but it doesn't exactly seem like a killer. > Then the memory stats dump code would just need to know to print this > field if it isn't NULL.
That's not a bad idea. How about storing a Node* instead of a char*? Then we could have MemoryContextStats etc support digging out details for a few types, without having to generate strings at runtime.
That'd render it pretty useless for extensions, though.
I like the idea of being able to introspect state for particular kinds of contexts, and not have to generate strings that 99.99% of the time won't get get looked at.
Function pointers instead of char* ? It adds a significant potential stability risk to MemoryContextStats() calls, but a great deal of flexibility.
