ircd::allocator: Add mallinfo to string support w/ console command.

include/ircd/allocator.h

@@ -26,6 +26,7 @@ namespace ircd::allocator
 	template<class T> struct node;
 
 	bool trim(const size_t &pad = 0); // malloc_trim(3)
+	string_view info(const mutable_buffer &);
 };
 
 /// Profiling counters.

ircd/allocator.cc

@@ -18,6 +18,40 @@
 //
 // #define RB_PROF_ALLOC
 
+#if defined(__GNU_LIBRARY__) && defined(HAVE_MALLOC_H)
+ircd::string_view
+ircd::allocator::info(const mutable_buffer &buf)
+{
+	std::stringstream out;
+	pubsetbuf(out, buf);
+
+	const auto ma
+	{
+		::mallinfo()
+	};
+
+	out << "arena:     " << ma.arena << std::endl
+	    << "ordblks:   " << ma.ordblks << std::endl
+	    << "smblks:    " << ma.smblks << std::endl
+	    << "hblks:     " << ma.hblks << std::endl
+	    << "hblkhd:    " << ma.hblkhd << std::endl
+	    << "usmblks:   " << ma.usmblks << std::endl
+	    << "fsmblks:   " << ma.fsmblks << std::endl
+	    << "uordblks:  " << ma.uordblks << std::endl
+	    << "fordblks:  " << ma.fordblks << std::endl
+	    << "keepcost:  " << ma.keepcost << std::endl
+	    ;
+
+	return view(out, buf);
+}
+#else
+ircd::string_view
+ircd::allocator::info(const mutable_buffer &buf)
+{
+	return {};
+}
+#endif
+
 #if defined(__GNU_LIBRARY__) && defined(HAVE_MALLOC_H)
 bool
 ircd::allocator::trim(const size_t &pad)

modules/console.cc

@@ -535,6 +535,11 @@ console_cmd__mem(opt &out, const string_view &line)
 	    << "freed count ____ " << this_thread.free_count << std::endl
 	    << "alloc bytes ____ " << this_thread.alloc_bytes << std::endl
 	    << "freed bytes ____ " << this_thread.free_bytes << std::endl
+	    << std::endl;
+
+	thread_local char buf[1024];
+	out << "malloc() information:" << std::endl
+	    << allocator::info(buf) << std::endl
 	    ;
 
 	return true;