Re: Enhancing Memory Context Statistics Reporting

Hi Rahila,

Thanks for working on this.  I've wanted something like this a number
of times to replace my current method of attaching gdb like everyone
else I suppose.

I have a question / suggestion about the interface.

+Datum
+pg_get_process_memory_contexts(PG_FUNCTION_ARGS)
+{
+    int         pid = PG_GETARG_INT32(0);
+    bool        get_summary = PG_GETARG_BOOL(1);

IIUC, this always returns all memory contexts starting from
TopMemoryContext, summarizing some child contexts if memory doesn't
suffice. Would it be helpful to allow users to specify a context other
than TopMemoryContext as the root? This could be particularly useful
in cases where the information a user is looking for would otherwise
be grouped under "Remaining Totals." Alternatively, is there a way to
achieve this with the current function, perhaps by specifying a
condition in the WHERE clause?